Photomultiplication-Type Organic Photodetectors with High EQE-Bandwidth Product by Introducing a Perovskite Quantum Dot Interlayer
- Authors
- Jeong, Minyoung; Han, Se Gyo; Sung, Woong; Kim, Seunghyun; Min, Jiwoo; Kim, Mi Kyong; Choi, Wookjin; Lee, Hansol; Lee, Dongki; Kim, Min; Cho, Kilwon
- Issue Date
- Jul-2023
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- ion migration; organic photodetectors; perovskite quantum dots; photomultiplication
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.33, no.27
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 33
- Number
- 27
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/88411
- DOI
- 10.1002/adfm.202300695
- ISSN
- 1616-301X
1616-3028
- Abstract
- A photomultiplication (PM)-type organic photodetector (OPD) that exploits the ionic motion in CsPbI3 perovskite quantum dots (QDs) is demonstrated. The device uses a QD monolayer as a PM-inducing interlayer and a donor-acceptor bulk heterojunction (BHJ) layer as a photoactive layer. When the device is illuminated, negative ions in the CsPbI3 QD migrate and accumulate near the interface between the QDs and the electrode; these processes induce hole injection from the electrode and yield the PM phenomenon with an external quantum efficiency (EQE) >2000% at a 3 V applied bias. It is confirmed that the ionic motion of the CsPbI3 QDs can induce a shift in the work function of the QD/electrode interface and that the dynamics of ionic motion determines the response speed of the device. The PM OPD showed a large EQE-bandwidth product >10(6) Hz with a -3 dB frequency of 125 kHz at 3 V, which is one of the highest response speeds reported for a PM OPD. The PM-inducing strategy that exploits ionic motion of the interlayer is a potential approach to achieving high-efficiency PM OPDs.
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Collections - 공과대학 > 화공생명공학과 > 1. Journal Articles
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