Ali Javey (Advisor)

Research Advised by Professor Ali Javey

Javey Group:  List of Projects | List of Researchers

Ashwin Aggarwal

Graduate Student Researcher
Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)
M.S. 2023

Ashwin received his B.A. in Computer Science from UC Berkeley in 2022 and is currently pursuing a research-based Masters in Electrical Engineering and Computer Science under the supervision of Ali javey. His research is focused on building novel modalities for capturing sweat rate. In addition, he employs data science techniques and analysis to supplement these sensors. On the side, Ashwin enjoys building websites & mobile applications and playing tennis.

Low Dimensional Materials for Next Generation Electronics

Steven Chuang
Ali Javey
2014

Ever since the invention of the transistor, aggressive channel length scaling has been pursued to achieve higher performance and greater packing density. In order to preserve gate control at short channel lengths, the transistor channel has evolved from bulk to low dimensional substrates, such as 2D thin films and 1D nanowires. For scaling to continue, it is vital that we understand the processing and physics of low dimensional materials.

Chapter 2 focuses on quasi-2D ultrathin body InAsSb-on-insulator n-FETs. III-V materials offer high mobilities for excellent on-state currents,...

Vivian Wang

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

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.

Understanding Radiative Recombination in Two Dimensional Semiconductors

Shiekh Zia Uddin
Ali Javey
2023

Pulsed Electroluminescent Devices for Emission Across Energy and Length Scales

Vivian Wang
Ali Javey
2023

Unusual device architectures may open up unexpected opportunities for optoelectronic devices. For example, the range of luminescent materials that can be easily integrated in light-emitting devices is often limited by material processing and band alignment issues. This hinders the development of electroluminescent devices at extreme wavelengths and the use of electroluminescence spectroscopy as an analytical technique. In this thesis, I explore an unconventional scheme of electrically-driven light emission based on pulsed metal-oxidesemiconductor capacitor devices. This concept can be used...

Two-Dimensional Semiconductors for Next-Generation Optoelectronics

Hyungjin Kim
Ali Javey
2022

Naoki Higashitarumizu

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

Dr. Naoki Higashitarumizu is a postdoctoral fellow in Electrical Engineering and Computer Sciences at UC Berkeley, with a joint appointment as a postdoctoral fellow in the Materials Science Division at Lawrence Berkeley National Laboratory. He received a Ph.D. in material engineering from The University of Tokyo in 2020, and was a postdoctoral fellow at The University of Tokyo in 2020. Dr. Higashitarumizu then joined Javey Research Group in September 2020.

BSAC Spring...

BPN982: Color-Tunable Alternating Current Light Emitting Diodes

Jongchan Kim
Vivian Wang
2022

Alternating current (AC) driven light emitting devices (LEDs) are recently dragging attention due to its efficient color tunability. These devices consist of multilayer structure as the direct current (DC) driven LEDs, but the multilayer structure has drawbacks such as the large amount of material usage that increases the fabrication cost, and the difficult yield control due to a number of processing steps. In contrast, a recently demonstrated AC driven LED with a single contact has several advantages compared to the previous structures such as simple device structure, diverse...

Single-Pixel Reconstructive Mid-Infrared Micro-Spectrometer

Kaichen Dong
Jiachen Li
Tiancheng Zhang
Fangda Gu
Yuhang Cai
Niharika Gupta
Ali Javey
Jie Yao
Junqiao Wu
2023

Miniaturized spectrometers in the mid-infrared (MIR) are critical in developing next-generation portable electronics for advanced sensing and analysis. The bulky gratings or detector/filter arrays in conventional micro-spectrometers set a physical limitation to their miniaturization. In this work, we demonstrate a single-pixel MIR micro-spectrometer that reconstructs the sample transmission spectrum by a spectrally dispersed light source instead of spatially grated light beams. The spectrally tunable MIR light source is realized based on the thermal emissivity engineered via the metal-...

Anomalous Thickness Dependence of Photoluminescence Quantum Yield in Black Phosphorous

Naoki Higashitarumizu
Shiekh Zia Uddin
Daniel Weinberg
Nima Sefidmooye Azar
I K M Reaz Rahman
Vivian Wang
Kenneth B. Crozier
Eran Rabani
Ali Javey
2023

Black phosphorus has emerged as a unique optoelectronic material, exhibiting tunable and high device performance from mid-infrared to visible wavelengths. Understanding the photophysics of this system is of interest to further advance device technologies based on it. Here we report the thickness dependence of the photoluminescence quantum yield at room temperature in black phosphorus while measuring the various radiative and non-radiative recombination rates. As the thickness decreases from bulk to ~4 nm, a drop in the photoluminescence quantum yield is initially observed due to enhanced...