期刊
NANO ENERGY
卷 82, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105701
关键词
Inverted perovskite solar cells; Dopant-free hole transporting Materials; Dicyanofluoranthene; Flexible devices
类别
资金
- Natural Science Foundation of China [21975085]
- APRC Grant of the City University of Hong Kong [9380086, 9610421]
- Innovation and Technology Support Programme [ITS/497/18FP, GHP/021/18SZ]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- Office of Naval Research [N00014-20-1-2191]
- ECS grant from the Research Grants Council of Hong Kong [CityU 21301319]
- Natural Science Foundation of Guangdong Province [2019A1515010761]
- Guangdong Major Project of Basic and Applied Basic Research [2019B030302007]
Low cost, highly efficient dopant-free hole transporting materials (HTMs) are essential for the commercialization of perovskite solar cells. A facile synthetic route was designed to prepare two new HTMs with low lab synthetic costs, enabling optimization of photophysical and charge transporting properties. BTF6, with metamethoxyl substitutions, exhibited significantly better device efficiency compared to BTF5, due to its matched energy levels with perovskites and enhanced hole mobility.
Low cost, highly efficient dopant-free hole transporting materials (HTMs) are highly desirable for the commercialization of perovskite solar cells (PVSCs). Herein, a facile synthetic route is designed to prepare two new D-A-D-type HTMs (BTF5 and BTF6) with low lab synthetic costs by making dicyanofluoranthene as the key intermediate. The rational structure modifications of donor subunits enable a significant optimization of photophysical, charge transporting properties and final device performance for resulting HTMs. BTF6 with metamethoxyl substitutions exhibits more matched energy levels with perovskites and much enhanced hole mobility in comparison to BTF5 with para-methoxyl substitutions, thereby leading to significantly distinct device efficiencies as dopant-free HTMs in inverted PVSCs, 20.34% for BTF6 vs. 11.42% for BTF5. In addition, the unsatisfactory crystallinity of perovskite films atop BTF5 is found to be another major reason for its significantly poor device efficiency. More encouragingly, it is further demonstrated that BTF6 can be suitable for fabricating dopant-free flexible PVSCs towards a promising PCE over 18% with a low hysteresis, which is the highest value for flexible devices based on small molecule HTMs, and even can be comparable to the best PCEs reported from self-doped PEDOT:PSS.
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