期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 11, 页码 13254-13263出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c22993
关键词
perovskite solar cells; hole-transporting materials; dopant-free; dibenzofulvene-bridged indacenodithiophene core; fill factor
资金
- National Key Research and Development Program of China [2018YFB0704100]
- Leading Talents of Guangdong Province Program [2016LJ06N507]
- Research and Development Program of Guangdong Province for Key Areas [2019B010941001]
- Shenzhen Basic Research Fund [CYJ20170817110652558]
- Natural Science Foundation Project of Jilin Province [20180101181JC, 20180623042TC]
- Project of Human Resources and Social Security Department of Jilin Province [2017956]
- Project of Jilin Province Development and Reform Commission [2019C044]
Inspired by spiro-OMeTAD, two novel HTMs, IT-C6 and IT-C8, based on butterfly-shaped triarylamine groups, were synthesized. IT-C6 exhibited higher glass-transition temperature and overall better performance compared to IT-C8. The inverted devices using these HTMs showed high fill factors and promising potential for future applications.
Inspired by the structural advantages of spiro-OMeTAD, which is the most commonly used hole-transporting material (HTM), two rationally designed HTMs with butterfly-shaped triarylamine groups based on dibenzofulvene-bridged indacenodithiophene (IDT) core (attaching hexyl and octyl chains) have been synthesized, namely, IT-C6 and IT-C8, respectively. Shorter alkyl-chain-based IT-C6 exhibits a marked increase in glass-transition temperature (T-g) of 105 degrees C, whereas IT-C8 shows a T-g of 95 degrees C. Moreover, it is demonstrated that IT-C6 exhibits a higher hole-transporting mobility, more suitable band energy alignment, better interfacial contact, and passivation effect. The inverted devices of employed HTM based on IT-C6 obtained a champion PCE of 18.34% with a remarkable fill factor (FF) of 82.32%, whereas the IT-C8-based device delivered an inferior PCE of 16.94% with an FF up to 81.20%. Both HTMs embodied inverted devices present high FF values greater than 81%, which are among the highest reported values of small molecular HTM-based PSCs. This work reveals that cutting off the symmetrical spiro-core and subsequently combining IDT (attaching tailored alkyl chains) with the spiro-linkage fluorine to construct the orthogonal molecular conformation is a significant principle for the design of promising dopant-free HTMs.
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