Efficient rare earth co-doped TiO2 electron transport layer for high-performance perovskite solar cells

[Display omitted] Perovskite solar cells (PSCs) had received great attention as a result of their recent rapid increasing efficiency. However, the stability of PSCs is still a challenge due to the degradation of the perovskite layer caused by the high-energy ultraviolet (UV) irradiation. Inspired by...

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Bibliographic Details
Published in:Journal of colloid and interface science 2019-10, Vol.553, p.14-21
Main Authors: Zhang, Boxue, Song, Zonglong, Jin, Junjie, Bi, Wenbo, Li, Hao, Chen, Cong, Dai, Qilin, Xu, Lin, Song, Hongwei
Format: Article
Language:English
Subjects:
Flexibility
Perovskite solar cells
Pulsed laser deposition
Rare earth doped
Stability
TiO2
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Summary:[Display omitted] Perovskite solar cells (PSCs) had received great attention as a result of their recent rapid increasing efficiency. However, the stability of PSCs is still a challenge due to the degradation of the perovskite layer caused by the high-energy ultraviolet (UV) irradiation. Inspired by the luminescent down converting ability for UV blocking and conversion as well as energy transfer between suitable rare earth (RE) ions, a planar CH3NH3PbI3 perovskite solar cell using Sm3+ and Eu3+ co-doped TiO2 electron transfer layer was designed. By optimizing the Sm3+ and Eu3+ doping concentration, the REs co-doped TiO2 ETL combines the advantages of high electron extraction and lower interfacial recombination caused by REs introduction, a power conversion efficiency of 19.01% was obtained. In addition, benefit from the enhanced ability to convert UV light into visible light of the co-doped ETL, the PSCs can sustain higher than at least 80% of the original efficiency over 25 days of full sunlight irradiation or after 100 h of UV illumination. Moreover, since the low-temperature pulsed laser deposition was adopted in ETL fabrication process, the large area (225 mm2) and flexibility devices were further explored, with PCEs of 12.60% and 15.48%, respectively. This work indicates that Sm3+ and Eu3+ co-doped ETLs are effective and promising method to enhance the photovoltaic performance and UV stability of PSCs, which can be further applied in other PSCs with different ETLs and co-doping types.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2019.06.003