Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 8, Pages 3655-3663Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta11800k
Keywords
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Funding
- National Natural Science Foundation of China [91733301, 61674109]
- National Key R&D Program of China [2016YFA0202400]
- Natural Science Foundation of Jiangsu Province [BK20170059]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2018KF07]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project of The State Administration of Foreign Experts Affairs of China
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2,2,7,7-Tetrakis-(N, N-di-p-methoxyphenylamine) 9,9-bifluorene (Spiro-OMeTAD) is a widely employed hole-transporting layer (HTL) in typical n-i-p structure perovskite solar cells (PSCs). And the p-type dopants of bis(trifluoromethane) sulfonimide lithium salt (Li-TFSI) and tert-butylpyridine (tBP) have to be utilized to improve the hole mobility and film conductivity of Spiro-OMeTAD. However, the incorporation of these additives will cause the issue of deliquescence, strongly speeding up the degradation of the Spiro-OMeTAD layer and thus of the perovskite layer. Herein, we developed a modified Spiro-OMeTAD layer using MoS2 with the 2H semiconducting phase and flower-like microstructure. The addition of MoS2 played an important role in improving the hole mobility and enhancing the film stability of Spiro-OMeTAD. The resulting PSCs based on the MoS2-modified Spiro-OMeTAD HTL delivered a champion power conversion efficiency as high as 20.18%. More importantly, the incorporation of MoS2 could suppress the Li+ migration in the HTL owing to the strong adsorption ability and large specific surface area of flower-like MoS2 nanoparticles. As a result, the fabricated PSC without encapsulation exhibited promising stability by retaining almost 85% of the initial PCE even after 300 h exposure to air while the reference device only retained about 30% of its initial PCE.
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