期刊
SOLAR RRL
卷 6, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202200484
关键词
hole transport layers; monolayer graphene; NiOx; perovskite solar cells
资金
- National Natural Science Foundation of China [U1732126, 52072182, 51872145]
- China Postdoctoral Science Foundation [2019M650120, 2020M671554]
- National Synergetic Innovation Center for Advanced Materials (SICAM)
- Ministry of Education in Saudi Arabia [526]
The study focused on transferring a defect-free monolayer graphene sheet onto the NiOx film surface as a template for van der Waals epitaxial growth of perovskite films, which enhanced the crystallinity, reduced the energy level offset, and accelerated charge transfer of the devices, leading to an improved power conversion efficiency of the inverted planar perovskite solar cells.
Inverted planar perovskite solar cells (PSCs) have intrigued great promise in negative hysteresis, simple fabrication process, and flexible substrate implementation, in which the shared hole transport materiel is NiOx. However, the low-temperature solution processing of the NiOx film is usually accompanied by defect formation, which deteriorates the perovskite quality and device performance. Meanwhile, the energy-level offset between the NiOx and perovskite films is relatively large, limiting the interfacial charge transport. To suppress those setbacks, a defect-free monolayer graphene sheet is transferred onto the NiOx film surface as a template for van der Waals epitaxial growth of perovskite films for the first time, leading to enhancing crystallinity with a large grain size of perovskite layer, 0.20 eV energy level offset drop, and accelerating charge transfer for the devices. Finally, the power conversion efficiency of 19.21% without hysteresis is achieved, exceeding 18.35% of the control device.
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