Photomultiplication-Type Organic Photodetectors with High EQE-Bandwidth Product by Introducing a Perovskite Quantum Dot Interlayer

被引：24

作者：

Jeong, Minyoung ^{[1
]}

Han, Se Gyo ^{[1
]}

Sung, Woong ^{[1
]}

Kim, Seunghyun ^{[1
]}

Min, Jiwoo ^{[1
]}

Kim, Mi Kyong ^{[2
]}

Choi, Wookjin ^{[3
]}

Lee, Hansol ^{[4
]}

Lee, Dongki ^{[5
]}

Kim, Min ^{[2
]}

Cho, Kilwon ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Dept Chem Engn, Pohang 37673, South Korea

[2] Jeonbuk Natl Univ, Grad Sch Integrated Energy AI, Jeonju 54896, South Korea

[3] Kyoto Univ, Grad Sch Engn, Div Mol Engn Program, Inuyama 6068501, Japan

[4] Gachon Univ, Dept Chem & Biol Engn, Seongnam 13120, South Korea

[5] Sejong Univ, Dept Nanotechnol & Adv Mat Engn, Seoul 05006, South Korea

来源：

ADVANCED FUNCTIONAL MATERIALS | 2023年 / 33卷 / 27期

基金：

新加坡国家研究基金会;

关键词：

ion migration; organic photodetectors; perovskite quantum dots; photomultiplication; CHARGE ACCUMULATION; NANOCRYSTALS; PERFORMANCE;

D O I：

10.1002/adfm.202300695

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页数：8

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