Journal
SOLAR RRL
Volume 5, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100404
Keywords
BMIMBF4; carbon electrodes; CsPbI2Br solar cells; surface passivation
Funding
- Japan Society for the Promotion of Science [20K15381]
- National Natural Science Foundation of China [51972293, 51772039]
- Research Centre for Solar Light Energy Conversion, Kyushu Institute of Technology
- [15K05597]
- Grants-in-Aid for Scientific Research [20K15381] Funding Source: KAKEN
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In this study, the use of BMIMBF4 successfully addressed the energy-level mismatch issue between CsPbI2Br and carbon electrodes, resulting in improved power conversion efficiency of C-PSCs and enhanced stability.
Carbon-based hole transport material (HTM)-free CsPbI2Br perovskite solar cells (C-PSCs) have garnered considerable attention due to their super thermal stability. The energy-level mismatch between the CsPbI2Br perovskite and carbon electrodes, however, results in major energy loss and reduced power conversion efficiency (PCE) of C-PSCs. Herein, 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) is used to manage the energy level, reduce defect densities, and improve the interface quality between CsPbI2Br and carbon electrodes. Preliminary results demonstrate that the BMIMBF4 modifier can passivate the surface defects of the perovskite film and reduce the energy-level mismatch between the CsPbI2Br layer and the carbon electrode. A PCE of 14.03% is achieved by introducing BMIMBF4 which is improved by 23% compared with the control device (11.37%). Moreover, stability whether in the case of C-PSCs or CsPbI2Br films-is also improved.
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