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Improved Fullerene-Free Polymer Solar Cells Using Rationally Designed Binary Mixed Solution of Electron Extracting Layer

Abstract

In continuation of progressive development of cathode interfacial engineering for successfully improving power conversion efficiency (PCE) of organic solar cells (OSCs), breakthrough attention of combination of two small organic materials named as Alq3 (Aluminum tris(8-hydroxyquinolinate)) and QPhPBr (tetraphenylphosphonium bromide) in one solution act as cathode interfacial layer (CIL) has been performed. Strong electron extracting property of Alq3 mentioned earlier but crucial process of vacuum deposition gain our concept to propose this idea of mixed binary solution processing technique. We successfully delivered the high performance of PCE above 11% with increased Voc (0.860 V), Jsc (19.01 mA/cm2) and FF (67.44%) together using combination of Alq3 with QPhPBr as CIL fabricated using the conventional device structure with PBDB-T:ITIC-Th as the blended active layer. The PCE is of 2.5-folds higher than the reference device of bare Al cathode (4.38% PCE). Moreover, the binary mixed solution of CIL has shown better performance than the Ca/Al based device with the PCE value 1.5-times higher than that value of 7.32% of the Ca/Al device. Their attractive performance has promoted a new challenge for new upcoming bulk-heterojunction OSCs in future prospects.

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Publication details

The article was received on 26 Jun 2018, accepted on 07 Aug 2018 and first published on 08 Aug 2018


Article type: Research Article
DOI: 10.1039/C8QM00311D
Citation: Mater. Chem. Front., 2018, Accepted Manuscript
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    Improved Fullerene-Free Polymer Solar Cells Using Rationally Designed Binary Mixed Solution of Electron Extracting Layer

    M. Gupta, D. Yan, J. Yao and C. Zhan, Mater. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QM00311D

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