期刊
JOURNAL OF POWER SOURCES
卷 360, 期 -, 页码 157-165出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.06.013
关键词
Inverted planar perovskite solar cell; Non-wetting hole transport material; Ultraviolet-ozone modification; Solution process
资金
- Hong Kong Innovation and Technology Commission [ITS/186/16]
- National Natural Science Foundation of China [61574120]
- Guangdong province Natural Science Foundation of China [2015A030313001]
- CityU Applied Research Grant [9667127]
Non-wetting hole transport materials (HTMs) have great potential in facilitating large-sized perovskite crystal growth and enhancing device stability by opposing moisture ingress, However, the severe non wetting issue limits the wide application of these materials in low-temperature solution-processed inverted planar perovskite solar cells (PVSCs), and corresponding devices are rarely reported. Here, a facile ultraviolet-ozone (UVO) modification method is demonstrated to overcome this issue. By carefully controlling the UVO modification time, the surface wettability of poly-TPD can be tuned without affecting the bulk properties of the film, hence perovskite films with desired grain size and excellent coverage can be deposited via a one-step spin-coating method. Benefiting from the high-quality perovskite, well-matched energy level alignment and hydrophobic property of poly-TPD, the resulting PVSCs show a champion power conversion efficiency of 18.19% with significantly enhanced stability as compared to the PEDOT:PSS counterparts. Moreover, the UVO modification approach also demonstrates its validity when being extended to other hydrophobic HTMs. This work not only provides a general strategy to broaden the selection pool of HTMs for solution-processed inverted planar PVSCs, but also may triggers the exploration of more advanced strategies to make non-wetting HTMs applicable in solution-processed inverted planar PVSCs. (C) 2017 Elsevier B.V. All rights reserved.
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