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Issue 33, 2018
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Improving the exciton dissociation of polymer/fullerene interfaces with a minimal loading amount of energy cascading molecular dopant

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Abstract

In this work, a novel star-shaped conjugated small molecule, 2,2′,2′′-((benzo[1,2-b:3,4-b′:5,6-b′′]trithiophene-2,5,8-triyltris(3-(2-ethylhexyl)thiophene-5,2-diyl))tris(methanylylidene))trimalono-nitrile (BTTCN), with a benzotrithiophene donor unit as the core structure and the electron-withdrawing dicyano groups as the end-cappers, was designed and synthesized. It was used as the third component to construct ternary polymer solar cells (PSCs) based on a typical polymer/fullerene binary host (PTB7-Th:PC71BM). The results manifested that BTTCN served as an energy cascading interlayer to improve the exciton dissociation and transport of the active layer by doping with only a minimal amount of BTTCN that aided to construct a cascade energy level alignment. In contrast to the binary blends, the as-prepared PSCs with 3 wt% BTTCN dopant showed enhanced short-circuit current densities (JSC), which resulted in an enhanced power conversion efficiency (PCE) from 8.72% to 9.43%.

Graphical abstract: Improving the exciton dissociation of polymer/fullerene interfaces with a minimal loading amount of energy cascading molecular dopant

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Publication details

The article was received on 03 Apr 2018, accepted on 20 Jul 2018 and first published on 20 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA03043J
J. Mater. Chem. A, 2018,6, 15977-15984

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    Improving the exciton dissociation of polymer/fullerene interfaces with a minimal loading amount of energy cascading molecular dopant

    Y. Wang, W. Xu, J. Yi, C. Zuo, Y. Gong, Y. Liu, W. Lai and W. Huang, J. Mater. Chem. A, 2018, 6, 15977
    DOI: 10.1039/C8TA03043J

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