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Non-equilibrium Ti4+ doping strategy for an efficient hematite electron transport layer in perovskite solar cells

Abstract

Non-equilibrium Ti4+-doped hematite (Ti-Fe2O3) is explored successfully as electron transporting layer (ETL) material for planar perovskite solar cells, which was simply processed by quenching the ETL films at high temperature after thermal annealing. High-temperature quenching can fix Ti4+ dopants in bulk lattices of Ti-Fe2O3 and suppress surficial TiOx segregations on it, which obviously increase the doping density and decrease surficial electron traps in Ti-Fe2O3 ETLs, thereby greatly improving their electron transport property. Hence, the efficiency of planar perovskite solar cells with these desired Ti-Fe2O3 ETLs can be boosted to 17.85% along with the stabilized value of 17.05%, which is much higher than that of cells with Ti-Fe2O3 ETLs prepared by routinely natural cooling and even the previous record efficiency of planar cells based on Fe2O3 ETLs. Our work contributes to enriching the ETL systems of perovskite solar cells and offers a promising candidate for efficient and photo-stable cells.

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Publication details

The article was received on 21 Feb 2018, accepted on 05 Apr 2018 and first published on 06 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00692J
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Non-equilibrium Ti4+ doping strategy for an efficient hematite electron transport layer in perovskite solar cells

    W. Zhu, Q. Zhang, C. Zhang, D. Chen, L. Zhou, Z. Lin, J. Chang, J. Zhang and Y. Hao, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00692J

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