Ali Javey (Advisor)

Research Advised by Professor Ali Javey

Javey Group:  List of Projects | List of Researchers

Wearable Biosensors for Body Computing

Yuanjing Lin
Mallika Bariya
Ali Javey
2020
The challenges of growing and aging populations combined with limited clinical resources have created huge demand for wearable and portable healthcare devices. Research advances in wearable biosensors have made it easier to achieve reliable noninvasive monitoring of health and body status. In this review, recent progress in the development of body computing systems for personalized healthcare is presented, with key considerations and case studies. Critical form factors for wearable sensors, their materials, structures, power sources, modes of data communication, and the types of...

Bright Mid-Wave Infrared Resonant-Cavity Light-Emitting Diodes Based on Black Phosphorus

Niharika Gupta
Hyungjin Kim
Nima Azar
Shiekh Zia Uddin
Der-Hsien Lien
Kenneth B. Crozier
Ali Javey
2022
The mid-wave infrared (MWIR) wavelength range plays a central role in a variety of applications, including optical gas sensing, industrial process control, spectroscopy, and infrared (IR) countermeasures. Among the MWIR light sources, light-emitting diodes (LEDs) have the advantages of simple design, room-temperature operation, and low cost. Owing to the low Auger recombination at high carrier densities and direct bandgap of black phosphorus (bP), it can serve as a high quantum efficiency emitting layer in LEDs. In this work, we demonstrate bP-LEDs exhibiting high external quantum...

Resettable Microfluidics for Broad-Range and Prolonged Sweat Rate Sensing

Mallika Bariya
Noelle Davis
Liam Gillan
Elina Jansson
Annukka Kokkonen
Colm McCaffrey
Jussi Hiltunen
Ali Javey
2022
Wearable sweat sensors are emerging as promising platforms for personalized and real-time tracking of evolving health and fitness parameters. While most wearable sweat sensors focus on tracking biomarker concentration profiles, sweat secretion rate is a key metric with broad implications for assessing hydration, cardiac, and neural conditions. Here we present a wearable microfluidic sensor for continuous sweat rate measurement. A discrete impedimetric sensing scheme relying on interdigitated electrodes within a microfluidic sweat collector allows for precise and selective sweat rate...

Yingbo Zhao

Alumni
Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)
PostDoc 2021

Dr. Yingbo Zhao obtained his B.S. in Chemistry in 2012 from the University of Science and Technology of China. Then he got his Ph.D. in physical chemistry in 2017 from UC Berkeley (advisor Prof.Omar Yaghi). Currently, he is a postdoctoral researcher in EECS, UC Berkeley with Prof. Ali Javey.

Highly Multicolored Light-Emitting Arrays for Spectral Sensing

Vivian Wang
2022
Fall 2022 BSAC Research Review Presentation View Slides View Presentation at 00:44

BSAC's Best: Fall 2022 Awards Announced

September 28, 2022

BSAC would like to thank all of the researchers who presented their research during BSAC's Fall 2022 Research Review on September 21st.

BSAC Industrial Members voted for the outstanding paper and presentations and the results are in. Please join BSAC in congratulating the recipients of the Fall 2022 Best of BSAC honors, Alex Moreno, Mutasem Odeh, and Vivian Wang!

Outstanding Presenter...

BPN925: Perfectly Bright Low Dimensional Semiconductors

Shiekh Zia Uddin
Jongchan Kim
2022

Most optoelectronic devices operate at high photocarrier densities, where all semiconductors suffer from enhanced nonradiative recombination. Nonradiative processes proportionately reduce photoluminescence (PL) quantum yield (QY), a performance metric that directly dictates the maximum device efficiency. Although transition metal dichalcogenide (TMDC) monolayers exhibit near-unity PL QY at low exciton densities, nonradiative exciton-exciton annihilation (EEA) enhanced by van-Hove singularity (VHS) rapidly degrades their PL QY at high exciton densities and limits their utility in...

Jongchan Kim

Alumni
Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)
Ph.D. 2021, PostDoc 2022

Shiekh Zia Uddin

Alumni
Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)
Ph.D. 2022

Shiekh Zia Uddin received his Bachelors in Science degree in Electrical and Electronics Engineering from Bangladesh University of Engineering and Technology (BUET). In his undergraduate, he worked on both biomedical signal processing and nanophotonics. His current research is on photophysics and optoelectronics of low dimensional semiconductors.

Dissertation title: Understanding Radiative Recombination in Two Dimensional Semiconductors

Perfectly Bright Two-Dimensional Semiconductors

Shiekh Zia Uddin
2022
Spring 2022 BSAC Research Review Presentation View Slides View Presentation

Defects in conventional semiconductors substantially lower the photoluminescence (PL) quantum yield (QY), a key metric of optoelectronic performance that directly dictates the maximum device efficiency. Two-dimensional transition-metal dichalcogenides (...