journal article·2022-11-30Open access

Contribution of Sub-Gap States to Broadband Infrared Response in Organic Bulk Heterojunctions

Ning Li, Insun Park, Jarrett H. Vella, Soong Ju Oh, Jason D. Azoulay, Dong-Seok Leem, Tse Nga Ng

ACS Applied Materials & Interfaces· Volume 14· Issue 47

Abstract

This work studied a series of infrared detectors comprised of organic bulk heterojunctions to explain the origin of their broadband spectral response from the visible to the infrared spanning 1 to 8 μm and the transition from photonic to bolometric operation. Through comparisons of the detector current and the sub-bandgap density of states, the mid- and long-wave infrared response was attributed to charge trap-and-release processes that impact thermal charge generation and the activation energy of charge mobility. We further demonstrate how the sub-bandgap characteristics, mobility activation energy, and effective bandgap are key design parameters for controlling the device temperature coefficient of resistance, which reached up to -7%/K, better than other thin-film materials such as amorphous silicon and vanadium oxide.
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Research context

OpenAlex topics: Mechanical and Optical Resonators · Perovskite Materials and Applications · Optical and Acousto-Optic Technologies

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Affiliations

Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California92093-0407, United States

School of Electronic and Optical Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing, CN210094, People’s Republic of China

Samsung Advanced Institute of Technology, Samsung Electronics, Co., Ltd., 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do16678, South Korea

Sensors Directorate, Air Force Research Laboratory, Wright−Patterson Air Force Base, Dayton45433-7131, Ohio, United States

Department of Materials Science and Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul02841, Republic of Korea

School of Polymer Science and Engineering, The University of Southern Mississippi, 118 College Drive #5050, Hattiesburg, Mississippi39406, United States

Funding

Samsung Advanced Institute of Technology · National Science Foundation · Air Force Office of Scientific Research (AFOSR) Organic Materials Chemistry Program

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