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Design and Synthesis of a New Non-Fullerene Acceptor for High-Performance Photomultiplication-Type Organic Photodiodes

Title
Design and Synthesis of a New Non-Fullerene Acceptor for High-Performance Photomultiplication-Type Organic Photodiodes
Authors
Sim, Hye RyunKang, MingyunYu, Seong HoonNam, Geon-HeeLim, BogyuChung, Dae Sung
DGIST Authors
Sim, Hye Ryun; Kang, Mingyun; Yu, Seong Hoon; Nam, Geon-Hee; Lim, Bogyu; Chung, Dae Sung
Issue Date
2021-02
Citation
Advanced Optical Materials, 9(4)
Type
Article
Article Type
Article; Early Access
Author Keywords
high-performance photodiodesnon-fullerene acceptorsorganic photodiodesphotomultiplicationpolymer semiconductors
Keywords
POLYMER PHOTODETECTORS
ISSN
2195-1071
Abstract
Photomultiplication-type organic photodiodes (PM-OPDs) rely on acceptor molecules for both charge separation and efficient gain generation. Herein, a new non-fullerene acceptor is designed and synthesized by introducing thienylenevinylene (TV) groups into the conventional 2,2MODIFIER LETTER PRIME-[[6,6,12,12-tetrakis(4-hexylphenyl)-6,12-dihydrodithieno[2,3-d:2MODIFIER LETTER PRIME,3MODIFIER LETTER PRIME-dMODIFIER LETTER PRIME]-s-indaceno[1,2-b:5,6-bMODIFIER LETTER PRIME]dithiophene-2,8-diyl]bis[methylidyne(3-oxo-1H-indene-2,1(3H)-diylidene)]]bis[propanedinitrile] (ITIC) structure. The resulting TV-ITIC acceptor possesses not only extended pi-conjugation length, which leads to lower energy bandgap as well as deeper lowest unoccupied molecular orbital (LUMO) level, but also enhanced hydrophobic characteristics, owing to the increased volumetric portion of the aliphatic chain, which improves the miscibility with the donor polymer semiconductor, poly(3-hexylthiophene-2,5-diyl) (P3HT). Moreover, pristine TV-ITIC films consist of intrinsically well-ordered anisotropic crystallites, which are confirmed by 2D grazing incidence X-ray diffraction (2D-GIXD) analysis. All of these photophysical properties are beneficial for efficient exciton separation, electron trapping, and charge injection abilities of PM-OPDs compared to those obtained with conventional ITIC. Because of such synergetic contributions of TV-ITIC to the photomultiplication mechanism, the resulting optimized PM-OPD exhibits a high external quantum efficiency (>74,000%) and a large specific detectivity (>10(12) Jones). © 2020 Wiley-VCH GmbH
URI
http://hdl.handle.net/20.500.11750/12824
DOI
10.1002/adom.202001836
Publisher
Wiley
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringPolymer Energy Materials Lab1. Journal Articles


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