Co/Eu co-doped electron transport layer enhances charge extraction and light absorption for efficient carbon-based HTM-free perovskite solar cells
- 25 March 2021
- journal article
- research article
- Published by Hindawi Limited in International Journal of Energy Research
- Vol. 45 (4), 5224-5234
- https://doi.org/10.1002/er.6137
Abstract
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.Funding Information
- Natural Science Foundation of Beijing Municipality (2202030)
- Project 211 (B14003)
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