期刊
CHEMSUSCHEM
卷 12, 期 1, 页码 224-230出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201802234
关键词
electron transport; energy conversion; perovskites; solar cells
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning
- Ministry of Education, Korea (Basic Science Research Program) [2014R1A5A1009799, 2018R1D1A1B07047645]
- Global Frontier R&D Program on Center for Multiscale Energy System [2012M3A6A7054855]
- National Research Foundation of Korea [2012M3A6A7054855, 2018R1D1A1B07047645] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A design strategy is proposed for electron-transporting materials (ETMs) with homochiral asymmetric-shaped groups for highly efficient non-fullerene perovskite solar cells (PSCs). The electron transporting N,N '-bis[(R)-1-phenylethyl]naphthalene-1,4,5,8-tetracarboxylic diimide (NDI-PhE) consists of two asymmetric-shaped chiral (R)-1-phenylethyl (PhE) groups that act as solubilizing groups by reducing molecular symmetry and increasing the free volume. NDI-PhE exhibits excellent film-forming ability with high solubility in various organic solvents [about two times higher solubility than the widely used fullerene-based phenyl-C-61-butyric acid methyl ester (PCBM) in o-dichlorobenzene]. NDI-PhE ETM-based inverted PSCs exhibit very high power conversion efficiencies (PCE) of up to 20.5 % with an average PCE of 18.74 +/- 0.95 %, which are higher than those of PCBM ETM-based PSCs. The high PCE of NDI-PhE ETM-based PSCs may be attributed to good film-forming abilities and to three-dimensional isotropic electron transporting capabilities. Therefore, introducing homochiral asymmetric-shaped groups onto charge-transporting materials is a good strategy for achieving high device performance.
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