期刊
CHEMICAL SCIENCE
卷 7, 期 8, 页码 5007-5012出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6sc00973e
关键词
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资金
- Shenzhen Science and Technology Research Grant [JCYJ20140509093817690]
- Shenzhen Key Laboratory of Organic Optoelectromagnetic Functional Materials of Shenzhen Science and Technology Plan [ZDSYS20140509094114164]
- Shenzhen Peacock Program [KQTD2014062714543296]
- Nanshan Innovation Agency Grant [KC2015ZDYF0016A]
- Guangdong Key Research Project [2014B090914003, 2015B090914002]
- National Basic Research Program of China (973 Program) [2015CB856505]
Three new spirofluorene-based hole transport materials, Spiro-S, Spiro-N, and Spiro-E, are synthesized by replacing the para-methoxy substituent in 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (Spiro-MeOTAD) with methylsulfanyl, N,N-dimethylamino and ethyl groups. Their properties as hole transport materials in perovskite solar cells are investigated. The impact of replacing the para-methoxy substituent on bulk properties, such as the photophysical properties, HOMO/LUMO energy level, hole extraction properties and morphologies of perovskite thin films are investigated. Their optoelectronic and charge-transport properties and performance in perovskite solar cells are compared with the current benchmarked and structurally-related hole transport material (HTM) Spiro-MeOTAD. Surprisingly, the methylsulfanyl substituted spirofluorene shows the highest power conversion efficiency of 15.92% among the investigated spirofluorenes, which is an over 38% increase in PCE compared with that of Spiro-MeOTAD under similar device fabrication conditions.
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