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Significant Enhancement of Responsivity of Organic Photodetectors upon Molecular Engineering

Abstract

Organic photodetectors (OPDs) have been widely studied to achieve high performance for light detection. Photocurrent, one key parameter determining the responsivity of photodetectors, is rarely investigated to enhance the performance. Herein, three small molecules are systematically designed, synthesized for OPDs. Through introducing S…O noncovalent conformational locks and changing side chains, the physicochemical properties of materials especially the light absorption range and blend film morphology are effectively tuned, leading to enhanced photocurrent and thus higher responsivity (from 0.07 A/W to 0.29 A/W at -0.5 V bias), which is among the highest values for OPDs. The mechanisms are systematically investigated with different techniques including the ultrafast transient absorption, vertical phase segregation, and charge transport mobility, which is consistent with the photodetectors’ performances. This contribution presents an efficient strategy to enhance the responsivity and shed lights on understanding the structure-property relationship of organic semiconductors for OPDs

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Publication details

The article was received on 30 Jan 2019, accepted on 11 Apr 2019 and first published on 11 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC00576E
Citation: J. Mater. Chem. C, 2019, Accepted Manuscript

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    Significant Enhancement of Responsivity of Organic Photodetectors upon Molecular Engineering

    L. Lv, J. Yu, X. Sui, J. Wu, X. Dong, G. Lu, X. Liu, A. Peng and H. Huang, J. Mater. Chem. C, 2019, Accepted Manuscript , DOI: 10.1039/C9TC00576E

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