Bandwidth and transient analysis of bilayer organic photodetectors |
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| Affiliation: | 1. Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Physics Department, University of Isfahan, Isfahan, Iran;1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China;2. Los Alamos National Laboratory, NM 87545, USA;1. Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, P.za L. da Vinci, 32, 20133, Milano, Italy;2. Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, Via Pascoli 70/3, 20133, Milano, Italy;1. National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 3058568, Japan;2. Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 2638522, Japan;3. Department of Photo-Molecular Science, Institute for Molecular Science, Myodaiji, Okazaki, Aichi, 4448585, Japan;4. College of Physical Science and Technology, Yangzhou University, Jiangsu, 225009, China;5. Faculty of Applied Sciences, Sabaragamuwa University of Sri Lanka, P.O. Box 02, Belihuloya, Sri Lanka |
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| Abstract: | Utilization of organic photodetectors (OPDs) and their applications for assembling on flexible and curved substrates have increased in recent years. However, organic semiconductors suffer from low carrier mobility that demands an optimized design and precise modeling for their applications. The OPDs frequency bandwidth is one of the most important criteria that needs to be investigated carefully. In this paper a comprehensive physical time-domain framework is introduced for bandwidth calculations as well as other several evaluation criteria. This model is verified by experimental measurements. According to the results, increasing the reverse bias voltage boosts the bandwidth of OPD owing to the increase of the carrier mobility. Based on the introduced simulation approach, the trade-off between the bandwidth and the responsivity has been investigated and an efficient design method is also proposed which could effectively improve the OPD performance. |
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| Keywords: | Organic semiconductors Photodetectors Bandwidth Exciton |
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