Ali Javey (Advisor)

Research Advised by Professor Ali Javey

BPN698: Multifunctional Electronic Skin

Kevin Chen

Flexible sensor networks have promising applications in fields such as touch sensors for touch sensitive prosthetics and wearable medical diagnosis devices. In this project, we aim to fabricate a multifunctional “e-skin” capable of detecting multiple forms of stimuli including light and pressure, so as to be able to mimic the human skin and beyond. Polyimide is spun onto a silicon wafer upon which traditional CMOS technology is used to fabricate flexible thin film transistors based on solution deposited carbon nanotube networks. Various types of sensors are then integrated to create...

BPN748: Highly Sensitive Electronic Whiskers Based on Patterned Carbon Nanotube and Silver Nanoparticle Composite Films

Zhibin Yu

Mammalian whiskers present an important class of tactile sensors that complement the functionalities of skin for detecting wind with high sensitivity and navigation around local obstacles. Here, we developed electronic whiskers based on highly tunable composite films of carbon nanotubes and silver nanoparticles that are patterned on high-aspect ratio elastic fibers. The nanotubes form a conductive network matrix with excellent bendability, while nanoparticle loading enhances the conductivity and endows the composite with high strain sensitivity. The resistivity of the composites is...

BPN752: Highly Efficient and Stable Photocathode for Solar Hydrogen Production

Yongjing Lin
Corsin Battaglia
Joel W. Ager

Solar hydrogen production by photoelectrochemical water splitting holds great promise for efficient solar energy harvesting and storage. To achieve spontaneous water splitting, developing efficient photoelectrodes with both high photovoltage and high photocurrent is highly desirable. However, current studied photocathodes such as p-Si, p-Cu2O and p-GaP have photovoltage lower than half of 1.23 V, the minimum voltage required for water splitting. To overcome these challenges, we are currently developing a photocathode using amorphous Si thin film with TiO2 encapsulation layer for...

BPN792: Thin Film InP Photoelectrochemical Cells for Efficient, Low-Cost Solar Fuel Production

Mark Hettick
Maxwell Zheng

While bulk p-type InP wafers have produced high efficiency photoelectrochemical water- splitting cells, the high cost of epitaxial substrates limits viability at a larger scale. Here, we utilize low-cost growth of InP on non-epitaxial substrates with the thin-film vapor- liquid-solid method to provide high efficiency, scalable photocathode cells for the hydrogen evolution reaction.

Project end date: 08/19/15

BPN712: Bridging Research-to-Commercialization Gaps In an Industry/University Ecosystem

John Huggins
Hossain M. Fahad
Hiroshi Shiraki
David Burnett
Nicola Accettura

Some BSAC members have, in our surveys and at IAB meetings, vocalized that we need to help bridge commercialization gaps and increase the speed of commercialization. Traditional University research commercialization paths through passive licensing to start-ups, are often highly successful and will remain the dominant path. But such paths do not leverage the sophisticated manufacturing, marketing, and sales channels of our larger Industrial members who could rapidly exploit certain research discoveries. While any such commercialization facilitation programs cannot compromise the...

BPN776: Wearable Electronic Tape

Hiroki Ota
Kevin Chen

We demonstrate a high-performance wearable piezoelectric electronic-tape (E-tape) for motion sensing based on a carbon nanotube (CNT)/silver nanoparticle (AgNP) composite encased in PDMS and VHB flexible thin films. E-tape sensors directly attached to human skin exhibit fast and accurate electric response to bending and stretching movements which induce change in conductivity with high sensitivity. Furthermore, E-tape sensors for a wide range of applications can be realized by the combination of controlling the concentration of AgNPs in the CNT network and designing appropriate...

BPN746: Liquid Heterojunction Sensors

Hiroki Ota
Kevin Chen

In recent years, mechanically deformable devices and sensors have been widely explored for various applications such as paper-thin displays and electronic skin for prosthetics and robotics. Liquids are extremely deformable and have shown promise for these applications, with previous works demonstrating pressure sensors with the ability to be stretched by up to 250% before failure.However, current technology is limited to a single liquid material as liquids tend to intermix when placed together, limiting the range of sensors that can be achieved. Here, in this work, we show a new...

BPN821: 3D Printed Smart Application with Embedded Electronics Sensors and Systems

Yuji Gao

Our goal is the development of personalized applications using a 3D printed process which integrates liquid-state printed components and interconnects with readily available silicon IC chips layered across all three dimensions with various orientations to deliver fully integrated system-level functionalities. Our process allows for personalization of objects with electronic capabilities through the incorporation of advanced IC components and various sensing and actuation functionalities within complex 3D architectures. As an example application, our process can be used to develop...

BPN850: Wearable Sweat Rate Sensor

Li-Chia Tai
Wei Gao

Wearable sensor is a growing area in which real-time monitoring of an individual’s health status can be realized. Recently, skin-worn sensors capable of screening biomarkers in human body fluids have been developed. Since human sweat contains physiologically insightful information, it is a wonderful candidate for non-invasive health monitoring. In particular, sweat rate information is highly desired as it can provide a more complete picture for sweat analysis. Hence, the objective of this work is to develop a wearable sensor capable of monitoring sweat rate.

Project end...

BPN694: Monolayer Semiconductor Devices

Matin Amani

Transition metal dichalcogenides (TMDCs) have the potential to be used in the future generation of electronic and optoelectronic devices due to their superior material properties compared to the conventional semiconductors. Although many proof of concept devices have been shown using TMDCs, the presence of large contact resistances are still a fundamental challenge to be able to realize the full potential of this material family in the functional devices. In this work, we study defect engineering by using a mild H2 plasma treatment to create defects in the WSe2 lattice. Material...