Ali Javey (Advisor)

Research Advised by Professor Ali Javey

Shiekh Zia Uddin Receives the 2022 MRS Graduate Student Gold Award

May 1, 2022

Please join BSAC in congratulating Shiekh Zia Uddin of the Javey group on being awarded the 2022 Materials Research Society (MRS) Graduate Student Gold Award.

The MRS Award recognizes "students of exceptional ability who show promise for significant future achievement in materials research." Uddin works in the areas of photophysics and optoelectronics of low dimensional semiconductors, with a focus on the photophysics of low-dimensional excitonic materials. He was honored for research...

Drug Monitoring with Wearable Sweat Sensors

Li-Chia Tai
2022

Wearable sensors have been very popular among us to monitor our physical wellness, and they are potentially important for health monitoring with implications toward preventive care and clinical treatment. On the market, noninvasive wearables can be used to track external metrics such as heart rate and ECG signal. However, they fail to inform users about elusive biomarkers at the molecular level, which can potentially provide more insight into a person’s health situation. Traditionally, accessing bio-molecular information requires collecting blood or urine samples with invasive extraction...

Manik Dautta

Postdoctoral Researcher
Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)
PostDoc 2022

Niharika Gupta

Graduate Student Researcher
Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)
Ph.D. 2022

Vivian Wang

Graduate Student Researcher
Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)
Ph.D. 2023 (Anticipated)

Vivian Wang received a B.S. in Electrical Engineering from Stanford Univeristy in 2017 and a M.Phil. in Physics from the University of Cambridge in 2018. She is currently pursuing a Ph.D. in Electrical Engineering and Computer Sciences at UC Berkeley under the supervision of Prof. Ali Javey.

Low Voltage AC Electroluminescence in Silicon MOS Capacitors

I K M Reaz Rahman
Shiekh Zia Uddin
Hyungjin Kim
Naoki Higashitarumizu
Ali Javey
2022
Low power silicon based light source and detector are attractive for on-chip photonic circuits given their ease of process integration. However, conventional silicon light emitting diodes emit photons with energies near the band edge where the corresponding silicon photodetectors lack responsivity. On the other hand, previously reported hot carrier electroluminescent silicon devices utilizing a reverse biased diode require high operating voltages. Here, we investigate hot carrier electroluminescence in silicon metal–oxide–semiconductor capacitors operating under transient voltage conditions...

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.