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Title: Comprehensive studies of response characteristics of organic photodetectors based on rubrene and C{sub 60}

Abstract

We studied the transient response characteristics of organic photodetectors composing of high mobility materials of rubrene and C{sub 60}, respectively, as donor and acceptor. It was found that the response speed was limited by the delay time of both exciton diffusion and transit, and an anomalous phenomenon that the bandwidth decreases as the reverse bias increases was found for the first time. The investigation of frequency dependence at different device structures and light excitations demonstrated that the light absorption of rubrene prevents the photodetector from obtaining a fast response. With the help of magnetic field effect study, it was clearly elucidated that the slow diffusion time of the long lifetime triplet excitons generated from singlet fission in rubrene limited the bandwidth of the device. Moreover, the simulation of the response of photodetector under transient and steady state by exciton transport-diffusion equation showed that the exciton dissociation efficiency in rubrene increases more quickly than that in C{sub 60}, which should account for the negative dependence of bandwidth on the reverse bias in rubrene-based device.

Authors:
; ; ; ;  [1]
  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)
Publication Date:
OSTI Identifier:
22304051
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; DIFFUSION; DIFFUSION EQUATIONS; DISSOCIATION; EFFICIENCY; EQUIPMENT; EXCITATION; EXCITONS; FREQUENCY DEPENDENCE; FULLERENES; LIFETIME; MAGNETIC FIELDS; NANOSTRUCTURES; ORGANIC SEMICONDUCTORS; PHOTODETECTORS; SIMULATION; STEADY-STATE CONDITIONS; TIME DELAY; TRANSIENTS; VISIBLE RADIATION

Citation Formats

Yang, Dezhi, Xu, Kai, Zhou, Xiaokang, Wang, Yanping, and Ma, Dongge. Comprehensive studies of response characteristics of organic photodetectors based on rubrene and C{sub 60}. United States: N. p., 2014. Web. doi:10.1063/1.4885078.
Yang, Dezhi, Xu, Kai, Zhou, Xiaokang, Wang, Yanping, & Ma, Dongge. Comprehensive studies of response characteristics of organic photodetectors based on rubrene and C{sub 60}. United States. https://doi.org/10.1063/1.4885078
Yang, Dezhi, Xu, Kai, Zhou, Xiaokang, Wang, Yanping, and Ma, Dongge. 2014. "Comprehensive studies of response characteristics of organic photodetectors based on rubrene and C{sub 60}". United States. https://doi.org/10.1063/1.4885078.
@article{osti_22304051,
title = {Comprehensive studies of response characteristics of organic photodetectors based on rubrene and C{sub 60}},
author = {Yang, Dezhi and Xu, Kai and Zhou, Xiaokang and Wang, Yanping and Ma, Dongge},
abstractNote = {We studied the transient response characteristics of organic photodetectors composing of high mobility materials of rubrene and C{sub 60}, respectively, as donor and acceptor. It was found that the response speed was limited by the delay time of both exciton diffusion and transit, and an anomalous phenomenon that the bandwidth decreases as the reverse bias increases was found for the first time. The investigation of frequency dependence at different device structures and light excitations demonstrated that the light absorption of rubrene prevents the photodetector from obtaining a fast response. With the help of magnetic field effect study, it was clearly elucidated that the slow diffusion time of the long lifetime triplet excitons generated from singlet fission in rubrene limited the bandwidth of the device. Moreover, the simulation of the response of photodetector under transient and steady state by exciton transport-diffusion equation showed that the exciton dissociation efficiency in rubrene increases more quickly than that in C{sub 60}, which should account for the negative dependence of bandwidth on the reverse bias in rubrene-based device.},
doi = {10.1063/1.4885078},
url = {https://www.osti.gov/biblio/22304051}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 24,
volume = 115,
place = {United States},
year = {Sat Jun 28 00:00:00 EDT 2014},
month = {Sat Jun 28 00:00:00 EDT 2014}
}