期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 123, 期 37, 页码 22767-22774出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b05931
关键词
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资金
- French Ministry of Higher Education and Research
- Region Centre, France
- CEDRE project [37335YM]
- French Government (Programme d'Investissement d'Avenir) [ANR-IEED-002-01]
- European Union [722651]
- LANEF framework [ANR-10-LABX-51-01]
New three-dimensional hole-transporting materials (HTMs) based on either 9,9'-spirobifluorene (SBF) or spiro-[cyclopenta[1,2-b:5,4-b']dithiophene-4,9'-fluorene] (SDTF) core have been synthesized. All three HTMs, namely, SBFCz2, SDTFCz2, and SDTCz2F, are end-capped with two peripheral 3,6-dimethoxydiphenylaminyl-carbazole (CzDMPA) units. The HTMs behave as molecular glasses with glass transition temperature (T-g) close to or higher than that of the reference HTM Spiro-OMeTAD. Thermal and optoelectronic properties strongly depend upon the nature of the bridging core unit between the two CzDMPA units. The two fluorene-bridged molecules SBFCz2 and SDTFCz2 exhibit similar properties. On the contrary, SDTCz2F, where the CzDMPA units are bridged to the cyclopentadithiophene ring, displays lower highest occupied molecular orbital/lowest unoccupied molecular orbital energy levels and smaller band gaps. Upon doping of the HTM layer in perovskite solar cells, in spite of a much lower hole mobility, SDTCz2F leads to the highest power conversion efficiency (16.4% compared to 14.5 and 14.3% for SBFCz2 and SDTFCz2, respectively).
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