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Proceedings Paper

Monolithic active pixel InGaAs focal plane arrays for near-infrared imaging
Author(s): Jiten Sarathy; George A. Gasparian; Michael J. Lange; Marshall J. Cohen; Gregory H. Olsen; Dong-Su Kim; Pavel Studenkov; Stephen R. Forrest
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Paper Abstract

We present the preliminary results of our investigation into the demonstration of a 16 X 16 element 'active-pixel sensor' array for imaging in the 0.5-2.5 micrometers wavelength spectrum. Each pixel consists of an InGaAs photodiode integrated with InP JFET-based signal processing electronics. An InP-based reset switch in each pixel is addressable using peripheral row and column select switches. The pixel architecture is based on a source-follower circuit. Each pixel has only four devices - three JFETs and a photodetector. This architecture can potentially lead to pixel fill factors in excess of 60 percent. The InP-based JFETs have extremely low leakage currents and high ON/OFF switching ratios. Each photodiode is independently addressed by applying a voltage to the reset terminal. Once the reset transistor Qa is switched ON, the photocurrent drives the output terminal using the source-follower circuit. The Sorce Follower Array architecture facilitates monolithic integration of the InP JFETs and InGaAs photodetectors with up to 2.5micrometers -wavelength cut-off. One important aspect of the JFET design is the p-type InP epilayer under the channel region of the JFET. This grown in p-n junction isolates the channel from the substrate thereby reducing the leakage current of the JFET.

Paper Details

Date Published: 15 April 1997
PDF: 10 pages
Proc. SPIE 2999, Photodetectors: Materials and Devices II, (15 April 1997); doi: 10.1117/12.271193
Show Author Affiliations
Jiten Sarathy, Sensors Unlimited Inc. (United States)
George A. Gasparian, Sensors Unlimited Inc. (United States)
Michael J. Lange, Sensors Unlimited Inc. (United States)
Marshall J. Cohen, Sensors Unlimited Inc. (United States)
Gregory H. Olsen, Sensors Unlimited Inc. (United States)
Dong-Su Kim, Princeton Univ. (United States)
Pavel Studenkov, Princeton Univ. (United States)
Stephen R. Forrest, Princeton Univ. (United States)

Published in SPIE Proceedings Vol. 2999:
Photodetectors: Materials and Devices II
Gail J. Brown; Manijeh Razeghi, Editor(s)

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