期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 23, 页码 21211-21217出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b01090
关键词
polymer photodetector; photomultiplication; nonfullerene acceptor; detectivity; external quantum efficiency
资金
- Space Core Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2014M1A3A3A02034707]
- National Research Foundation (NRF) of Korea [NRF-2016M1A2A2940911]
Here, a smart strategy for decreasing the active layer thickness of the organic photodiode down to 70 nm is demonstrated by utilizing a trap-assisted photomultiplication mechanism with the optimized chemical composition. Despite the presence of a high dark current, dramatically enhanced external quantum efficiency (EQE) via photomultiplication can allow significantly reduced active layer thickness, yielding high detectivity comparable to that of conventional Si. To achieve this, a spatially confined and electrically isolated optical sensitizer, 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno [1,2-b:5,6-b'] dithiophene-2,7-diyl)bis(methanylylidene))bis (3-oxo-2,3-dihydro-1H-indene-2,1-diylidene)) dimalononitrile (IDIC) was introduced strategically between a hole transport active layer and a cathode. A nonfullerene acceptor, IDIC, turned out to be a much more efficient sensitizer than the conventional fullerene-based acceptors, as confirmed by the effective lowering of the Schottky barrier under illumination, as well as the highest EQE exceeding 130 000%. Due to its favorable electronic structure as well as two-dimensional molecular structure, a high detectivity over 10(12) Jones was successfully demonstrated while maintaining the active layer thickness as 70 nm.
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