Ali Javey (Advisor)

Research Advised by Professor Ali Javey

Yu-Lun Chueh

Professor Ali Javey (Advisor)
PostDoc 2009

James Bullock

Professor Ali Javey (Advisor)
PostDoc 2018

Corsin Battaglia

Professor Ali Javey (Advisor)
PostDoc 2014

Actively Variable-Spectrum Optoelectronics with Black Phosphorus

Hyungjin Kim
Shiekh Zia Uddin
Der-Hsien Lien
Matthew Yeh
Nima Sefidmooye Azar
Sivacarendran Balendhran
Taehun Kim
Niharika Gupta
Yoonsoo Rho
Costas P. Grigoropoulos
Kenneth B. Crozier
Ali Javey

Room-temperature optoelectronic devices that operate at short-wavelength and mid-wavelength infrared ranges (one to eight micrometres) can be used for numerous applications. To achieve the range of operating wavelengths needed for a given application, a combination of materials with different bandgaps (for example, superlattices or heterostructures) or variations in the composition of semiconductor alloys during growth are used. However, these materials are complex to fabricate, and the operating range is fixed after fabrication. Although wide-range, active and reversible tunability...

Javey Lab: Researchers Demonstrate New Semiconductor Device Possibilities using Black Phosphorus

August 11, 2021

Stress and strain, applied in just the right manner, can sometimes produce amazing results.

That is what researchers, led by a team at UC Berkeley’s Department of Electrical Engineering and Computer Sciences, discovered about an emerging semiconductor material — black phosphorus (BP) — used to make two types of optoelectronic devices: light emitting diodes (LEDs) and photodetectors.

Under mechanical strain, BP can be induced to emit or detect infrared (IR) light in a range of desirable wavelengths — 2.3 to 5.5 micrometers, which spans the short- to mid-wave IR — and to do so...

Nanomaterials Processing Toward Large-scale Flexible/Stretchable Electronics

Toshitake Takahashi
Ali Javey
Tsu-Jae King Liu
Liwei Lin

In recent years, there has been tremendous progress in large-scale mechanically flexible electronics, where electrical components are fabricated on non-crystalline substrates such as plastics and glass. These devices are currently serving as the basis for various applications such as flat-panel displays, smart cards, and wearable electronics.

In this thesis, a promising approach using chemically synthesized nanomaterials is explored to overcome various obstacles current technology faces in this field. Here, we use chemically synthesized semiconducting nanowires (...

High Energy Density Metal Oxide and Conducting Polymer Supercapacitors

Roseanne Warren
Liwei Lin
Albert P. Pisano
Ali Javey

Supercapacitors are electrochemical energy storage devices characterized by rapid charge- discharge speeds, high power densities, and long cycle lifetimes compared to batteries.1,2 Supercapacitors have many promising applications as energy storage devices in electric vehicles, renewable energy systems, grid energy management, as well as stationary and portable electronics.2 A current limitation of supercapacitors is their low energy density compared to batteries, which hinders their application as stand-alone energy storage systems...

Electron Devices Based on Transition Metal Dichalcogenides

Mahmut Tosun
Ali Javey
Junqiao Wu
Liwei Lin

Integrated circuits consists of building blocks called transistors. A transistor is a switch that enables logic operations to perform computing. Since the invention of the first integrated circuit, transistors have been scaled down in their dimensions to increase the density of transistors per unit area to enable more functionality. Transistor scaling is continued by introducing novel device structures and materials at each technology node. Due to the challenges such as short channel effects and the power consumption issues, novel materials are investigated as a candidate for next...

Fully Integrated Complementary Metal Oxide Semiconductor (CMOS) Bio-Assay Platform

Octavian Florescu
Bernhard E. Boser
Richard M. White
Ali Javey
Eva Harris

We present a post-processed 6.25mm2 0.18μm Complementary Metal Oxide Semiconductor (CMOS) platform that leverages the advantages of super-paramagnetic bead labeling to integrate on-chip the label separation and detection functionalities required for high sensitivity bio-assays. The surfaces of the CMOS chip and of the magnetic beads are functionalized with bio-chemicals complementary to a target analyte. In a sandwich capture format, the presence of the target analyte will strongly bind 4.5μm magnetic bead labels to the...

Xiaobo Zhang

Electrical Engineering and Computer Sciences
Professor Ali Javey (Advisor)
Ph.D. 2013