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Proceedings Paper

Novel photodetector design using open circuit voltage for mid-wave infrared imagers
Author(s): Teressa Specht; Zahra Taghipour; Theodore J. Ronningen; Roman Fragasse; Ramy Tantawy; Shane Smith; Earl Fuller; Waleed Khalil; Sanjay Krishna
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Paper Abstract

Strong motivation for low-cost infrared imaging devices over the past few years have given rise to advances in infrared detector technology, specifically in the mid-wave infrared (MWIR) region. With increasing demand for small pixel sizes and large format focal plane arrays (FPAs), the extreme complexity in realizing MWIR imagers is expected to increase in difficulty. In this work, a novel approach to provide improved infrared detection at high operating temperatures is proposed by integrating proven MWIR photovoltaic material and mature digital CMOS Image Sensor (CIS) technology in a resultant technology concept of an open circuit voltage photodetector (VocP). With this new approach to photon detection, the photosensitive material generates an open circuit voltage to control the drain current of a transistor. The drain current can then be considered the photocurrent in the proposed pixel design. The VocP design decouples the photocurrent from the pixel area, exploits the invariance of open circuit voltage to pixel dimensions, improves the detectors dark current, and results in higher sensitivity. The proposed approach also couples an infrared sensitive material to CIS technology that is well established and continues to be advanced for visible imagers. In this paper, initial research demonstrations and test results are presented to provide evidence of MWIR detection at high operating temperatures to prove the concept and modeling predictions for the sensitivity and dynamic range of VocP.

Paper Details

Date Published: 7 May 2019
PDF: 7 pages
Proc. SPIE 11002, Infrared Technology and Applications XLV, 1100225 (7 May 2019); doi: 10.1117/12.2519211
Show Author Affiliations
Teressa Specht, The Ohio State Univ. (United States)
Zahra Taghipour, The Ohio State Univ. (United States)
Theodore J. Ronningen, The Ohio State Univ. (United States)
Roman Fragasse, The Ohio State Univ. (United States)
Ramy Tantawy, The Ohio State Univ. (United States)
Shane Smith, The Ohio State Univ. (United States)
Earl Fuller, SK Infrared (United States)
Waleed Khalil, The Ohio State Univ. (United States)
Sanjay Krishna, The Ohio State Univ. (United States)

Published in SPIE Proceedings Vol. 11002:
Infrared Technology and Applications XLV
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson, Editor(s)

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