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김진영

Kim, Jin Young
Next Generation Energy Lab.
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Vertically Phase Separated Photomultiplication Organic Photodetectors with p-n Heterojunction Type UltrafastDynamic Characteristics

Author(s)
Kim, Myeong InLee, SoonyongKang, JinhyeonKim, JaehyeongWu, ZiangWon, Jong HoBaek, SeyeonChung, Dae SungKim, Jin YoungJung, In HwanWoo, Han Young
Issued Date
2024-09
DOI
10.1002/adma.202404597
URI
https://scholarworks.unist.ac.kr/handle/201301/83445
Citation
ADVANCED MATERIALS, v.36, no.36, pp.2404597
Abstract
Photomultiplication (PM)-type organic photodetectors (OPDs), which typically form a homogeneous distribution (HD) of n-type dopants in a p-type polymer host (HD PM-type OPDs), have achieved a breakthrough in device responsivity by surpassing a theoretical limit of external quantum efficiency (EQE). However, they face limitations in higher dark current and slower dynamic characteristics compared to p-n heterojunction (p-n HJ) OPDs due to inherent long lifetime of trapped electrons. To overcome this, a new PM-type OPD is developed that demonstrates ultrafast dynamic properties through a vertical phase separation (VPS) strategy between the p-type polymer and n-type acceptor, referred to as VPS PM-type OPDs. Notably, VPS PM-type OPDs show three orders of magnitude increase in -3 dB cut-off frequency (120 kHz) and over a 200-fold faster response time (rising time = 4.8 mu s, falling time = 8.3 mu s) compared to HD PM-type OPDs, while maintaining high EQE of 1121% and specific detectivity of 2.53 x 10(13) Jones at -10 V. The VPS PM-type OPD represents a groundbreaking advancement by demonstrating the coexistence of p-n HJ and PM modes within a single photoactive layer for the first time. This innovative approach holds the potential to enhance both static and dynamic properties of OPDs.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
0935-9648
Keyword (Author)
fast dynamic propertyorganic photodetectorphotomultiplicationp-n heterojunction characteristicvertical phase separation
Keyword
DARK CURRENTPHOTODIODES

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