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Small-molecular Iridium complex based organic solar cells with improved photovoltaic performance through device optimization

Abstract

Small-molecular Iridium complex based organic solar cells (OSCs) show inferior power conversion efficiencies (PCEs) to pure organic/polymer analogues. To further improve the performance of such OSCs, we reported a bilayer device structure, which was fabricated by sequentially spin-coating a p-type polymer semiconductor (poly[4,4’-bis(2-butyloctoxycarbonyl-[2,2’-bithiophene]-5,5-diyl)-alt-(2,2’bithiophene-5,5’diyl)]) (PDCBT) layer and a bulk-heterojunction (BHJ) layer with cyclometalated Ir complex (TBzIr) as donor and PC71BM as acceptor. Compared to the original TBzIr:PC71BM BHJ device, the bilayer PDCBT/ TBzIr:PC71BM structure exhibited identical high open circuit voltages of 0.92 V, both increased short circuit current from 9.25 to 11.14 mA cm-2 and fill factor from 0.46 to 0.61. The p-type PDCBT layer is inserted to afford extra light absorption, assist the upper BHJ blends to form optimized morphologies, as well as provide supplementary donor-acceptor interfaces to facilitate exciton dissociation. Therefore, the PCE could be significantly improved from 3.91% for TBzIr:PC71BM to 6.17% for PDCBT/TBzIr:PC71BM. To our best knowledge, this is the highest efficiency ever reported for small-molecular Ir complex based organic solar cells.

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Supplementary files

Article information


Submitted
14 Feb 2020
Accepted
11 Mar 2020
First published
11 Mar 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Small-molecular Iridium complex based organic solar cells with improved photovoltaic performance through device optimization

Y. Tao, T. Yang, X. Gao, Y. He and H. Wang, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/D0TC00779J

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