Journal
ORGANIC ELECTRONICS
Volume 100, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2021.106325
Keywords
Hole-transporting material; Substituted fluorene; End group engineering; Sulfonyldibenzene core; Perovskite solar cell
Funding
- National Natural Science Foundation of China [NSFC: 51733010, 21672267, 51973239, 52073316]
- Science and Technology Planning Project of Guangdong [2015B090913003, 2015B090915003]
- Fundamental Research Funds for the Central Universities
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The research developed a new hole-transporting material CS-06 with deep HOMO level, high hole mobility, and glass transition temperature, which can improve the efficiency and stability of perovskite solar cells.
High-performance hole-transporting materials (HTMs) play an essential role in improving efficiency and stability of perovskite solar cells (PSCs). Herein, we developed a new sulfonyldibenzene core based HTM named CS-06, which contains substituted fluorene-terminated moieties as end groups in molecular structure. It is found that, the substituted fluorene-terminated end groups render CS-06 with a deep HOMO level, high hole mobility and glass transition temperature, which are beneficial for improving hole extraction and decreasing recombination probabilities at HTM/perovskite interface. The champion device based on CS-06 can yield a power conversion efficiency of 21.10%, superior to devices based on its analog CS-04 (19.73%) as reference. This work provides an effective way to develop efficient HTMs through rational end group design to boost the photovoltaic performance of PSCs.
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