期刊
ORGANIC ELECTRONICS
卷 48, 期 -, 页码 61-67出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2017.05.012
关键词
Interfacial layer; Polyacetylene-based polyelectrolyte; Inverted polymer solar cells
资金
- Korean Government grants [NRF_2015R1A2A2A01003743, NRF_2016H1D5A1910319, NRF_2014R1A1A3051165, NRF-2014H1C1A1066748, Program_2009-0093819]
- National Research Foundation of Korea [2016H1D5A1910319, 2009-0093819] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Here we report that poly(N-dodecyl-2-ethynylpyridiniumbromide) (PDEPB) interlayers between electron-collecting zinc oxide (ZnO) layers and bulk heterojunction (BHJ) layers act as a universal interfacial layer for improving the performances of inverted-type polymer: fullerene solar cells. Three different BHJ layers, poly(3-hexylthiophene) (P3HT):[6,6]-phenyl-C-61-butyric acid methyl ester (PC61BM), poly[(4,8-bis(2-ethylhexyloxy)-benzo[1,2-b: 4,5-b'] dithiophene)-2,6-diyl-alt-(N-2-ethylhexylthieno[3,4c] pyrrole-4,6-dione)-2,6-diyl]] (PBDTTPD): PC61BM, and poly[4,8-bis[(2-ethylhexyl) oxy] benzo[1,2-b: 4,5b'] dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b]-thiophenediyl] (PTB7) and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM), were employed so as to prove the role of the PDEPB interlayers. Results showed that the power conversion efficiency (PCE) of polymer: fullerene solar cells with the three different BHJ layers increased in the presence of the PDEPB interlayers prepared from 0.5 mg/ml solutions. The improved PCE was attributed to the conformal coating of the PDEPB layers on the ZnO layers (by atomic force microscopy measurement), lowered work functions of ZnO induced by the PDEPB layers (by Kelvin probe measurement), and reduced interface resistance (by impedance spectroscopy measurement), as supported by the noticeable change in the atom environments of both the ZnO and PDEPB layers (by X-ray photoelectron spectroscopy measurement). (C) 2017 Elsevier B.V. All rights reserved.
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