期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 45, 期 4, 页码 5224-5234出版社
WILEY
DOI: 10.1002/er.6137
关键词
carbon; charge extraction; Co; Eu; ETL; PSCs
资金
- Beijing Natural Science Foundation [2202030]
- National Foundation of China [41422050303]
- Program of Introducing Talents of Discipline to Universities [B14003]
- Fundamental Research Funds for Central Universities [FRF-GF-19-001A, FRF-GF-19-002B]
A bimetal Co/Eu co-doping strategy was proposed to modify the electron transportation layer (ETL) in carbon-based hole-transport materials (HTM)-free perovskite solar cells (C-PSCs), resulting in significant enhancement of photovoltaic parameters and power conversion efficiencies (PCEs) from 11.12% to 14.06% while maintaining superior device stability. This approach provides possibilities for further exploration of high-efficiency C-PSCs by optimizing ETL with suitable doping.
Carbon-based hole-transport materials (HTM)-free perovskite solar cells (C-PSCs) have received increasing attention in photovoltaic fields thanks to the low priced and superior stability. Nevertheless, the C-PSCs still suffer from low power conversion efficiencies (PCEs) in comparison with conventional PSCs. Here, we report a bimetal Co/Eu co-doping strategy to modify the electron transportation layer (ETL), simultaneously improving the charge extraction and light absorption and thus the performance of HTM-free C-PSCs. Systematic experiments suggest that (i) Co doping passivates the electronic trap-states in TiO2 ETL, improving the charge transport properties; (ii) Eu doping enhances the photoresponse of PSCs. Combining them together in ETL, all the photovoltaic parameters of C-PSCs are appreciably enhanced, leading to a PCE leap from 11.12 to 14.06% while keeping a superior device stability. These results may provide possibilities for the exploration of high-efficiency C-PSCs by further optimizing ETL with suitable doping.
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