Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 2, Pages 366-373Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b03323
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Funding
- NSFC [61675017, 61975006]
- BNSF [4192049]
- FRFCU [2019YJS204]
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Broad response organic photodetectors (OPDs) with a photomultiplication (PM) effect are achieved with one absorber layer and one multiplication layer. The response range of the PM-OPDs is primarily determined by materials in the absorber layer, and the external quantum efficiency (EQE) of the PM-OPDs is mainly controlled by the multiplication layer. Here, double-layered PM-OPDs were designed with an ITO/ZnO/PM6:Y6/PC71BM:P3HT (100:5, w/w)/Au structure, where PM6:Y6 is employed as an absorber layer and PC71BM:P3HT is used as a multiplication layer. The optimal PM-OPDs exhibit a broad response covering 350-950 nm. Meanwhile, the optimal PM-OPDs exhibit the largest EQE value of similar to 1200% and a maximum specific detectivity (D*) of similar to 6.8 x 10(-12) cm Hz(1/2) W-1 under a 10 V bias. This double-layered approach may be a smart strategy for realizing PM-OPDs with an easily adjustable response range.
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