SF Bay Area Nanotechnology Council

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Archive for the ‘Past Events’ Category

November 20th, 2017: Semiconductor Nanowires for Optoelectronic and Energy Applications

Sunday, October 22nd, 2017

TALK:  Semiconductor Nanowires for Optoelectronic and Energy Applications

Co-sponsor: IEEE Photonics Society

SPEAKER:

Professor Hoe Tan

Department of Electronic Materials Engineering, Research School of Physics and Engineering
The Australian National University

Monday, November 20, 2017  11:30 AM – 1:00  PM

Texas Instruments (TI) Auditorium E-1
2900 Semiconductor Drive
Santa Clara, CA  map

Cost $6, discount for IEEE Members, Students & Unemployed. Please register here.

ABSTRACT:

The excitement of nanowire research is due to the unique electronic and optical properties of these nanostructures. Both axial and radial heterostructure nanowires have been proposed as nano-building blocks for the next generation devices, which are expected to revolutionise our technological world. Unique properties stem from nanowires’ large surface area-to-volume ratio, very high aspect ratio, and carrier and photon confinement in two dimensions. These nanowires are usually grown by the so-called vapor-liquid-solid mechanism, which relies on a metal nanoparticle to catalyze and seed the growth. An alternative technique to grow the nanowires is by selective area growth technique, where a dielectric mask is first patterned on the substrate prior to growth.

In this talk, I will present an overview of compound semiconductor nanowire research activities at The Australian National University. The optical and structural properties of binary and ternary III-V nanowires including GaAs, InGaAs, InP and GaAsSb nanowires grown by metal-organic vapour phase epitaxy will be presented. Various issues such as tapering of the nanowires, compositional non-uniformity along nanowires, crystal structure, carrier lifetime and polarization effect will be discussed.

I will also present our results of III-V nanowires grown on Si substrates which are of great interests for the integration of nano-optoelectronic devices on Si platforms. Our results of enhancing the quantum efficiency of nanowires by using plasmonics are promising to improve the performance of nanowire devices.

Finally, the results from our nanowire lasers, photodetectors, solar cells and photoelectrodes for water splitting will be presented.

SPEAKER BIOGRAPHY:

Prof. Tan is currently the Head of the Department of Electronic Materials Engineering at the Research School of Physics and Engineering, The Australian National University. Tan received his B.E. (Hons) in Electrical Engineering from the University of Melbourne in 1992, after which he worked with Osram in Malaysia as a quality assurance engineer. In 1997, he was awarded the PhD degree from the Australian National University for his dissertation on “Ion beam effects in GaAs-AlGaAs materials and devices”. He is a past recipient of the Australian Research Council Postdoctoral, QEII and Future Fellowships. He has published/co-published over 350 journal papers, including four book chapters. He is also a co-inventor in 4 US patents related to laser diodes and infrared photodetectors. His research interests include epitaxial growth of low-dimensional compound semiconductors, nanostructured optoelectronic devices and ion-implantation processing of compound semiconductors for optoelectronic device applications. Prof. Tan is a Senior Member of the IEEE and is the Distinguished Lecturer for IEEE Nanotechnology Council (2016) and IEEE Photonics Society (2016-2017).

  • 11:30 am – Registration & light lunch (pizza & drinks)
  • Noon – Presentation & Questions/Answers
  • 1:00 pm – Adjournment
COST: $6, discount for IEEE Members, Students & Unemployed.

 

October 17th 2017: Triboelectric Nanogenerator for NASA Mars Mission, Space Manufacturing & Next Generation Mechanical Energy Harvesting

Monday, October 9th, 2017

TALK: Triboelectric Nanogenerator for NASA Mars Mission, Space Manufacturing & Next Generation Mechanical Energy Harvesting

SPEAKER:

Myeong-Lok Seol

Research Scientist, NASA

Tuesday, October 17, 2017  11:30 AM – 1:00  PM

Texas Instruments (TI) Auditorium E-1
2900 Semiconductor Drive
Santa Clara, CA  map

Cost $6, discount for IEEE Members, Students & Unemployed. Please register here.

ABSTRACT:

Demand for mobile power sources is increasing with the growth of wireless sensor network, mobile healthcare devices, and internet-of-things (IoT). Currently, most applications use a battery as the sole power source, but all the batteries have a limited lifetime and require costly replacement and recharging, limiting the application area. Energy harvesting is a process that converts various types of ambient energy sources into electrical energy. By implementing energy harvesters, small-electronic systems can extend lifetime, reduce maintenance cost, and become more sustainable. Triboelectric nanogenerator is a mechanical energy harvester based on triboelectricity created at the contact interface between two different materials. Triboelectric nanogenerators are light in weight, generate high output power, require low material and manufacturing costs, and have a strong development potential.

In this talk, the background and fundamental principles of the triboelectric nanogenerator will be introduced. In addition, recent research progress of triboelectric nanogenerators for interplanetary missions in NASA will be presented.

SPEAKER BIOGRAPHY:

Myeong-Lok Seol is a Research Scientist at NASA Ames Research Center. His research interests include energy harvesting, nanotechnology-enabled electronics and sensors, functional nanostructures and nanomaterials. Currently, he is developing a triboelectric nanogenerator for interplanetary missions and all-printed energy harvester for autonomous manufacturing in space. He received his B.S. degree in 2010 and his Ph.D. degree in 2016 from Korea Advanced Institute of Science and Technology (KAIST), Korea. He has published 55 international journals, 7 international conferences, and 8 patents.

  • 11:30 am – Registration & light lunch (pizza & drinks)
  • Noon – Presentation & Questions/Answers
  • 1:00 pm – Adjournment
COST: $6, discount for IEEE Members, Students & Unemployed.

 

September 19th, 2017: Company Origin Stories – Exploring Entrepreneurship

Sunday, September 10th, 2017

Company Origin Stories – Exploring Entrepreneurship
Nanotech company founders explain how and why they started their enterprises
Register: Here

Tues Sept 19 – 5:30 PM to 9:15 PM
Cost: $17 – includes dinner – discounts for IEEE Members, Students & Unemployed

Location: Texas Instruments Building E Conference Center
2900 Semiconductor Dr., Santa Clara, CA 95052
See the TI Building location map and directions

Presenting Companies include:

View Dynamic Glass – Architectural “smart glass” using electrochromism from nano-scale layers of metal oxides. Raised $650M and has completed installation at several hundred sites. Read More

Nano Precision Medical – Subdermal implants using nano-structured membranes to provide long-term therapeutics for the treatment of chronic diseases. Read More

 

Fibralign – Biomedical devices based on artificial nano-structured collagen. Read More

August 15th 2017: 2D Materials Advantages and Challenges Towards Applications

Saturday, July 29th, 2017

TITLE: 2D Materials Advantages and Challenges Towards Applications

SPEAKER:

Ching-Hua (Fiona) Wang, PhD. Student

Electrical Engineering Department, Stanford University

Tuesday, August 15, 2017  11:30 AM – 1:00  pm

Texas Instruments (TI) Auditorium E-1
2900 Semiconductor Drive
Santa Clara, CA  map

Cost $6, discount for IEEE Members, Students & Unemployed. Please register here.

ABSTRACT:

Two-dimensional (2D) materials present unique opportunities for next generation ultra-thin electronics. However, practical 2D devices can only be realized after overcoming key challenges: contact resistance, stable doping, and uniform growth.
In this talk I will highlight the recent research our group has implemented to improve contact and doping in BP and MoS2 transistors.   I will then show our work beyond transistor applications using 2D materials, such as graphene-Cu interconnects and hBN-RRAM, that are promising for three-dimensional integrated electronics.

  • 11:30 am – Registration & light lunch (pizza & drinks)
  • Noon – Presentation & Questions/Answers
  • 1:00 pm – Adjourn
COST: $6, discount for IEEE Members, Students & Unemployed.

July 21 2017: Giving Optical Vision to Nanorobots

Tuesday, June 27th, 2017

TITLE: Giving Optical Vision to Nanorobots

SPEAKER: Dr. Wen J. Li

Chair Professor of Biomedical Engineering

Dept. of Mechanical and Biomedical Engineering

City University of Hong Kong

Friday, July 21, 2017  11:30 AM – 1:00  pm

Texas Instruments (TI) Auditorium E-1
2900 Semiconductor Drive
Santa Clara, CA  map

Cost $6, discount for IEEE Members, Students & Unemployed. Please register here.

ABSTRACT:

The resolution of optical microscopes has been constrained by Ernst Abbe’s limit of diffraction to 200–250nm under visible light illumination since the 17th Century. The invention of the Scanning Electron Microscope (SEM) about 80 years ago and Scanning Tunneling Microscope/Atomic Force Microscope (STM/AFM) about 35 years have made tremendous breakthroughs in observing and analyzing sub-diffraction scale features. Although non-optical technologies such as the SEM can provide resolution much beyond the optical diffraction limit, they are still mostly not compatible with real-time and non-destructive imaging (especially for biological samples) requirements, and therefore, a non-invasive and non-destructive imaging technology that can break the diffraction limit is still in demand.

In this lecture, we will present a novel time-efficient and non-invasive microsphere-based scanning superlens microscopy (SSUM) method that enables the observation of biological and non-bioligical samples over a large area with sub-diffraction limited resolution.  This technology operates in both non-invasive and contact modes with approximately 200 times the acquisition efficiency of atomic force microscopy. Our method marks a path to visible light based non-invasive nanoscale resolution with foreseeable applications in integrated circuit defect detection and bio-molecular imaging.

SPEAKER BIOGRAPHY:

    Wen J. Li (BSc/MSc, Univ. of Southern California, and PhD, UCLA) is Chair Professor of Biomedical Engineering in the Dept. of Mechanical and Biomedical Engineering of the City University of Hong Kong (CityU).  He is currently the President of the IEEE Nanotechnology Council and Director of the Institute for Intelligent Cyber Physical Sensing Systems of the Shenzhen Academy of Robotics, China. Prior to joining CityU, Dr. Li was with The Chinese University of Hong Kong (1997-2011), where he headed the Centre for Micro and Nano Systems. He held research positions at the NASA/CalTech Jet Propulsion Laboratory (1995-1997) and The Aerospace Corporation (1989-1995) before moving to Hong Kong in 1997.

Dr. Li’s team has published more than 300 technical papers related to MEMS, nanotechnology, and robotics; the team has received best conference/student paper awards from well-known conferences such as IEEE-ICRA, IEEE/ASME AIM, IEEE-ROBIO, and IEEE-NANO in the past 15 years.

Dr. Li served as the Editor-in-Chief of the IEEE Nanotechnology Magazine (2007 to 2013) and is an Editorial Board Member of Scientific Reports.   Dr. Li was elected IEEE Fellow in 2010 and ASME Fellow in 2011, and was a Distinguished Overseas Scholar of the Chinese Academy of Sciences.  He also held/holds honorary academic positions at the Shenyang Institute of Automation, Peking University, Huazhong University of Science and Technology, and Soochow University.

Dr. Li’s current research interest includes super-resolution nanoscopy, cyber physical sensors, and micro/nano robotics for biomedical applications.

  • 11:30 am – Registration & light lunch (pizza & drinks)
  • Noon – Presentation & Questions/Answers
  • 1:00 pm – Adjourn
COST: $6, discount for IEEE Members, Students & Unemployed.

June 20, 2017: Engineering Nanomaterials for Energy Conversion

Wednesday, June 7th, 2017

TITLE:  Engineering Nanomaterials for Energy Conversion

SPEAKER: Dr. Xiaolin Zheng, Dept. of Mechanical Engineering, Stanford University

Tuesday, June 20, 2017  11:30 AM – 1:00  pm

Texas Instruments (TI) Auditorium E-1
2900 Semiconductor Drive
Santa Clara, CA  map

Cost $6, discount for IEEE Members, Students & Unemployed. Please register here.

 

 

ABSTRACT:

Nanomaterials are broadly studied and used in renewable energy and sustainability-focused science and technology. And yet, a key challenge is to develop scalable and economic synthetic routes for the mass production of nanomaterials. In this talk, I will present a new pathway of using flame as a scalable reactor to synthesis binary, ternary, doped and branched metal oxide nanowires with controlled physical morphology and chemical compositions. I will also report a combined solution-flame method that combines flame synthesis with sol-gel chemistry to modify existing nanomaterials with coatings, doping, reduction and oxidation. These new flame synthesis routes exhibit the unique advantages of self-purification process, ultrafast growth rate, atmospheric and continuous operation. These flame-synthesized nanomaterials are of high quality and when they are applied as key elements in photoelectrochemical (or solar) water-splitting devices that has led to the best performance to date. Finally, I will discuss a peel-and-stick method for manufacturing flexible and light weight thin film solar cells that could enable the attachment of solar cells to virtually any surface, ranging from existing building walls and windows, car roofs, light poles, backpacks and paper to portable electronics, significantly broadening the applications of solar cells.

 

SPEAKER BIOGRAPHY:

Xiaolin Zheng is an Associate Professor of Mechanical Engineering at Stanford University. She received her Ph.D. in Mechanical & Aerospace Engineering from Princeton University (2006), B.S. in Thermal Engineering from Tsinghua University (2000). Prior to joining Stanford in 2007, she did her postdoctoral work in the Department of Chemistry and Chemical Biology at Harvard University. Her research interests include flame synthesis of nanomaterials and their applications in solar energy conversion, and developing manufacturing methods for flexible electronic devices. She is a member of MRS, ACS and the Combustion Institute. Her research has been honored with awards including the Resonant Energy Award from Caltech (2016), Nano Letters Young Investigator Lectureship (2015), MIT Technology Review (2013), one of the 100 Leading Global Thinkers by the Foreign Policy Magazine (2013), 3M Nontenured Faculty Award from 3M (2013), Presidential Early Career Award for Scientists and Engineers (PECASE) from the White House (2009), Young Investigator Awards from the ONR (2008) and DARPA (2008), Terman Fellowship from Stanford (2007), and Bernard Lewis Fellowship from the Combustion Institute (2004).

For additional information: http://www.stanford.edu/group/zheng

  • 11:30 am – Registration & light lunch (pizza & drinks)
  • Noon – Presentation & Questions/Answers
  • 1:00 pm – Adjourn
COST: $6, discount for IEEE Members, Students & Unemployed.

13th Annual Full Day Symposium: Nanotechnology in the Environment, Advanced Batteries and Clean Energy

Sunday, April 30th, 2017

IEEE SFBA Nanotechnology Council Chapter 13th Annual Full Day Symposium

“Nanotechnology in : The Environment, Advanced Batteries, Clean Energy”

May 16, 2017 8:30AM – 4:30 PM

SEMI Global Headquarters, 673 South Milpitas Boulevard, Milpitas, CA 95035

Register here

This symposium brings together leading academic, government and industry experts to discuss the innovation opportunities and technical challenges associated with the deployment of nanotechnology in the  above areas. Presentation Topics and Speakers include:

Nano Material Toxicity

Marie-Noele Croteau, USGS

Regulating Nano Toxicity

Jeffrey Wong, California Environmental Protection Agency

Hydrogen Storage

Jen Dionne, Stanford University

Carbon Dioxide Capture

Robert Aines, Livermore

Nanostructured, Bio-Derived Materials for Next-Generation Li-ion Batteries

Brennan Campbell, NexTech Batteries && Robert Ionescu, HP Labs

Carbon Nanotube Batteries for Solar Grid Storage & Electric Vehicles

John Wong, CTO, Magi Scitech

Job Seeker assistance will be available at this event, including a table with CVs and resumes available for people to pick up and an “Announcement Slide” which will be projected during the initial networking portion of the day. Job seekers, please bring your resumes to display on said table, send a one line description to be displayed on the “Announcement Slide” to SFBA.Nano.Jobs@gmail.com by May 14.

Register here

 Sponsors Include:

April 18th, 2017: Fully Inkjet-Printed RRAM Memory Circuits for Solution-Processed Electronics

Sunday, April 2nd, 2017

TITLE: Fully Inkjet-Printed RRAM Memory Circuits for Solution-Processed Electronics

SPEAKER: Jeremy Smith, PhD., U.C. Berkeley

Tuesday, April 18, 2017  11:30 AM – 1:00  pm

Texas Instruments (TI) Auditorium E-1
2900 Semiconductor Drive
Santa Clara, CA map

Cost $6, discount for IEEE Members, Students & Unemployed. Please register here.

ABSTRACT:

Inkjet printing provides a convenient, digital, additive manufacturing process to demonstrate the compatibility of solution-processed electronic materials suitable for flexible electronics, roll-to-roll processing, and large-area electronics.

This study also highlights some of the challenges of controlling film formation, nanoparticle ink development, and materials interactions in a realistic situation. I will discuss the use of sol-gel oxides and metal nanoparticle inks in a 3D printer for fabricating novel transistors and RRAM memory devices. In particular, using fully printed thin-film transistors (TFT),

I have studied several interface effects that are critical for device operation both in terms of the print morphology and also electrical injection and back surface effects. The dielectric, in this case ZrO2, was found to be very sensitive to the sol-gel drying conditions, which are not always well controlled during printing.

In the case of memory devices, resistive switching was employed in the Ag/ZrO2/Au system to fabricate printable RRAM memory arrays. These arrays can be operated as content addressable memory, which has many applications in pattern matching, image recognition, and synaptic-like memory behavior. However, controlling the uniformity of switching, especially in printed devices, is an important challenge. In conclusion, we show that knowledge of component materials, processing effects, and interactions of materials within a device are all critical to advancing the field of printed electronics.

Image by A13ean Use licensed under the Creative Commons Attribution

SPEAKER BIOGRAPHY:

Jeremy Smith received his MSci degree in Materials Science from the University of Cambridge in 2007 and his PhD in the Physics Department at Imperial College London. His research, under the supervision of Prof. Thomas D. Anthopoulos, was focused on the development of high mobility organic field-effect transistors with a particular interest in the links between thin-film morphology and charge transport.

He then worked in Prof. Tobin Marks’s group at Northwestern University on solution processed amorphous oxide semiconductors for printable, thin-film electronics, before conducting research with Prof. Vivek Subramanian at UC Berkeley also in the area of printed electronics.

  • 11:30 am – Registration & light lunch (pizza & drinks)
  • Noon – Presentation & Questions/Answers
  • 1:00 pm – Adjourn
COST: $6, discount for IEEE Members, Students & Unemployed.

Materials Studies of New High Efficiency Solar Absorbers

Monday, March 21st, 2016

TITLE: Materials Studies of New High Efficiency Perovskite Solar Absorbers

SPEAKER: Dr. Mike Toney, SLAC National Accelerator Laboratory & Stanford UniversityDr.Mike Toney

Tuesday, April 19th, 2016  11:30 AM – 1:00  pm
Texas Instruments (TI) Auditorium E-1
2900 Semiconductor Drive
Santa Clara, CA
map

Admission FREE ($5 donation requested). Please register here.

Cosponsored by IEEE Santa Clara Valley Photovoltaic Section and IEEE Santa Clara Valley Photonics Society

ABSTRACT:

Organic-inorganic halide perovskite films (e.g., methylammonium lead iodide  xrd3 or CH3NH3PbI3) were first employed as light absorbing layers in photovoltaic (PV) devices in 2009, and produced relatively modest power conversion efficiencies (PCEs) of 3.8%.Since then, the development of perovskite solar cells has been meteoric, with PCEs increasing from 3.8% to over 21% in just over five years.

The combination of high extinction coefficients, long charge carrier diffusion lengths and compatibility with low cost, solution-based fabrication processes gives these materials enormous commercial potential.

A significant appeal of CH3NH3PbI3 is their facile synthesis using solution processes. Typically a low temperature anneal (about 100 °C) is involved in film synthesis with subsequent cooling through the cubic-to-tetragonal phase transition near 65 °C. Since the transition temperature is within the range expected in real world device applications, it is therefore important to understand the structural behavior at this transition and its impact on the device performance.

In order to better understand this phase transition in CH3NH3PbI3 thin films, we have developed the capability for operando synchrotron X-ray diffraction by designing a sample stage for simultaneous, temperature dependent measurement of J-V curves and diffraction. This has allowed us to obtain X-ray diffraction data during the operation of CH3NH3PbI3 devices.

 Here I will present detailed structural characterization of the perovskite crystal structure with increasing temperature, including the tetragonal lattice distortion, octahedral rotations associated with the room temperature tetragonal phase, and thermal (disorder) parameters. The impact of these structural changes on the device J-V characteristics will be described and we comment on potential implications for material and device properties.

SPEAKER BIOGRAPHY:

Michael Toney is head of the Materials Sciences Division and a distinguished staff scientist at the Stanford Synchrotron Radiation Lightsource (SSRL), part of the SLAC National Accelerator Laboratory. He is a pioneer in the use of X-ray diffraction and small angle scattering for the determination of molecular and mesoscale structure of organic and polymeric thin films and for the determination of atomic structure of electrode-electrolyte interfaces. Toney received his BS from Caltech in 1979 and his PhD from the University of Washington in 1983, both in physics. He spend one year as a postdoc at the Risoe National Lab (now DTU) in Denmark, where he participated in some of the first surface X-ray diffraction experiments. He then began working at IBM Almaden Research in materials sciences. He left IBM in 2003 to join SLAC National Accelerator Laboratory and Stanford, where he starting programs in sustainable energy materials.

AGENDA:

  • 11:30 am – Registration & light lunch (pizza & drinks)
  • Noon – Presentation & Questions/Answers
  • 1:00 pm – Adjourn
COST: FREE, but a $5 donation is requested to help cover the cost of lunch

Please register here.

Also, visit our Meetup Group.

Bringing Better Pixels to UHD with Quantum Dots

Thursday, November 19th, 2015

 

Tuesday, December 15, 2015 151215 Charlie Hotz Nanosys Noon – 1  pm
Texas Instruments (TI) Auditorium E-1
2900 Semiconductor Drive
Santa Clara, CA
map

This seminar is being cosponsored by the Santa Clara Valley Chapter of the IEEE Vehicular Technology Society.

 

TITLE: Bringing Better Pixels to UHD with Quantum Dots
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SPEAKER: Dr. Charlie Hotz, Vice President of R&D, Nanosys

 

 

ABSTRACT:
Advances in Quantum Dot chemistry and synthesis have made them an ideal emitter for backlight units in LCDs, with over 25 retail SKUs using Quantum Dots now available ranging from 7” tablet size up to 85” TV size. The next wave of technology innovation in displays is upon us now with Ultra-High Definition, whose most well-known benefit is an increase in resolution from HD to 4K, but there is much more to this new broadcast specification. High dynamic range (HDR) and wide color gamut (WCG) bring more perceptible benefits to users in terms of an improved viewing experience than improved resolution alone.
The ultra-high color gamut standard adopted for UHD broadcast, known as Rec. 2020, was originally defined for laser-based projectors where the color primaries are on the color locus of the CIE diagram. Due to the deeply saturated color coordinates, Rec. 2020 is beyond the capabilities of OLEDs and conventional LED backlit LCDs. So is the Rec. 2020 color standard reachable for consumer displays or is it only for high-end laser-based projection systems? This presentation will explore the capability of using quantum dots in LCDs to reach the ultra-high color gamut of Rec. 2020.

SPEAKER BIOGRAPHY:
Dr. Charlie Hotz sets the vision for Nanosys’ design, invention of new products and development of existing products. Dr. Hotz has been with Nanosys for 2 years and has developed the company’s large-scale QD synthesis processes and equipment, including working with all the regulatory bodies such as the EPA and local jurisdictions.

Prior to Nanosys, Dr. Hotz was Vice President, R&D for 6 years at Solexant, a QD based photovoltaics company where he develop the first ever high efficiency QD solar cells.  Dr. Hotz also served as Vice President of R&D for 7 years at Quantum Dot Corporation, where he developed many QD products for diagnostic and biological applications which are still in use today at Thermo-Fischer, who acquired Quantum Dot Corporation.  Charlie has a Ph.D. in Chemistry from Michigan.

AGENDA:

  • 11:30 am – Registration & light lunch (pizza & drinks)
  • Noon – Presentation & Questions/Answers
  • 1:00 pm – Adjourn
COST: FREE

Please RSVP here by Monday December 14 at 5PM.