Highly stable photomultiplication-type organic photodetectors with single polymers containing intramolecular traps as the active layer
- Authors
- Zhao, Zijin; Liu, Baiqiao; Xu, Chunyu; Li, Longtao; Liu, Ming; Yang, Kaixuan; Jeong, Sang Young; Woo, Han Young; Yuan, Guangcai; Li, Weiwei; Zhang, Fujun
- Issue Date
- 26-5월-2022
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.10, no.20, pp.7822 - 7830
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 10
- Number
- 20
- Start Page
- 7822
- End Page
- 7830
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/141816
- DOI
- 10.1039/d2tc01297a
- ISSN
- 2050-7526
- Abstract
- Photomultiplication-type organic photodetectors (PM-OPDs) have attracted enormous interest owing to their high sensitivity toward weak light and, especially, due to their excellent parasitic stability when using a single polymer as the active layer. Herein, three different polymers, DCP1-3, were synthesized with different amounts of PC61BM pendants as intramolecular traps, and they were successfully applied to high-stability PM-OPDs. Photogenerated electrons will be trapped by suspended PC61BM in the polymers to induce interfacial band-bending for hole tunneling injection, and the injected holes can be efficiently transported along the channels of the polymer under bias. The thickness of the ultrathin PFN-Br interfacial layer was optimized to decrease the dark current density. An EQE of 19100% at 365 nm was obtained for DCP3-based PM-OPDs using PFN-Br as the interfacial layer under a bias of 20 V. The optimized PM-OPDs exhibit excellent stability, with no photocurrent decay after 70 days of storage in a nitrogen-filled glove box, which is attributed to the locking of donor and acceptor segments through covalent links in the polymer. The optimized PM-OPDs can be employed to measure the heart rate (HR) of humans under different pulsatile conditions, indicating the promising application prospects of PM-OPDs with a single polymer as the active layer.
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