Enhanced optical effect in a high-electron-mobility phototransistor device: two-dimensional modeling considering a realistic velocity-field relation

B. B. Pal; H. Mitra; Dharmendra P. Singh

doi:10.1117/12.163115

1 April 1994 Enhanced optical effect in a high-electron-mobility phototransistor device: two-dimensional modeling considering a realistic velocity-field relation

B. B. Pal, H. Mitra, Dharmendra P. Singh

Author Affiliations +

Optical Engineering, Vol. 33, Issue 4, (April 1994). https://doi.org/10.1117/12.163115

Abstract

An enhanced optical effect is observed in a high electron mobility transistor device when the radiation is allowed to fall on the gaps of the source, gate, and drain of a n-AlGaAs/GaAs system. A 2-D model is presented considering a realistic velocity field relation of carriers in the n-AlGaAs layer. Due to the incident radiation, a photovoltage is developed across the heterojunction in addition to band-edge discontinuity between the n-AlGaAs and GaAs layers. This photovoltage drags the electrons from the n-AlGaAs layer into the heterointerface, thus significantly enhancing the sheet concentration of 2-D electron gas. The drain current and transconductance of the device increase considerably. Plots have been made for the I-V characteristics and the transconductance versus gate voltage. Also, a ratio of drain current under illumination and drain current under a dark condition has been plotted against the input optical power density, which indicates that the overall gain of the device is enhanced by a factor of more than 10 compared to its dark case.

Citation Download Citation

B. B. Pal, H. Mitra, and Dharmendra P. Singh "Enhanced optical effect in a high-electron-mobility phototransistor device: two-dimensional modeling considering a realistic velocity-field relation," Optical Engineering 33(4), (1 April 1994). https://doi.org/10.1117/12.163115

Published: 1 April 1994

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE