Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201902078
Keywords
electrostatic potential; green solvents; hydrogen bonds; organic solar cells; stability
Categories
Funding
- National Natural Science Foundation of China (NSFC) [61775029, 61604035, 51533005]
- Fundamental Research Funds for the Central Universities [ZYGX2016Z010]
- International Cooperation and Exchange Project of Science and Technology Department of Sichuan Province [2019YFH0059, 2018HH0093]
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For comprehensive development of organic solar cells (OSCs), some factors such as environmental stability, low cost, insensitive film thickness, component contents tolerance, and green preparation processes are equally crucial to achieve high power conversion efficiencies (PCEs). In this work, a small molecule 3-(diethylamino)-7-imino-7H-benzo[4,51imidazo[1,2-a]-chromeno[3,2-c]pyridine-6-carbonitrile (DIBC), which is commercially available at low cost, is utilized to realize high-performance ternary OSCs. Demonstrated via Fourier transform infrared and 2D-1HN MR, DIBC can form hydrogen bond interactions with [6,61-phenyl-C-71-butyric acid methyl ester (PC71BM) in solid films. Further electrostatic potential (ESP) calculations indicate that the hydrogen bond interaction enhances the ESP of PC71BM and accelerates charge transport between donor and acceptor. As a result, poly(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-bO]dithiophene-2,6-diylalt-(4-(2-ethylhexyl)-3-fluorothienop,4-bithiophene-)-2-carboxylate-2-6-diyl (PTB7-Th):DIBC:PC71BM-based ternary OSC achieves a maximum efficiency of 12.17%, which is the best result of green solvent processed fullerene OSCs at present. It is noteworthy that the ternary OSCs also show great tolerance to film thickness and blend ratios. These unique properties are attributed to the hydrogen-bond-linked DIBC and PC71BM, which modulates molecule distribution and improves film morphology with an interpenetrating network structure. Furthermore, the DIBC containing device also exhibits good thermal and light radiation stability. These results illustrate that intermolecular hydrogen bond interaction has great potential for realizing high-performance OSCs.
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