Journal
CHEMICAL ENGINEERING JOURNAL
Volume 417, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129184
Keywords
Perovskite solar cell; Electron transport layer; Lattice mismatch; Energy level alignment; Interface engineering
Categories
Funding
- National Natural Science Foundation of China [61704131, 61804111]
- National Key Research and Development Program of China [2018YFB2202900]
- Key Research and Development Program of Shaanxi Province [2020GY-310]
- Fundamental Research Funds for the Central
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This study demonstrates a metal oxide/perovskite heterojunction engineering approach using LiF-doped SnO2 at the interface, which can modulate lattice constants, reduce lattice mismatch, and enhance charge transfer, resulting in improved efficiency and stability of perovskite solar cells.
Organic-inorganic perovskite solar cells (PSCs) have attracted much attentions due to their excellent photoelectric properties and low-cost fabrication. However, the performance of PSCs is seriously affected by the charge recombination at interface. Herein, we conducted a metal oxide/perovskite heterojunction engineering approach by utilizing a highly efficient LiF-doped SnO2 (SnO2:LiF)/perovskite interface. The theoretical and experimental results show that the LiF doping could modulate the lattice constant of SnO2, reduce the lattice mismatch between SnO2 and perovskite and hence reduce the trap states. Furthermore, LiF doping could enhance the conductivity of SnO2 ETL, improve the energy band alignment at interface, and enhance the charge transfer between SnO2 and perovskite. Consequently, the PSC based on SnO2:LiF/perovskite heterojunction achieves a high power conversion efficiency (PCE) of 21.33% with a V-oc of 1.13 V, a J(sc) of 24.00 mA/cm(2) and an FF of 0.78. Meanwhile, the devices exhibit improved stability under continuous AM 1.5G light illumination and high humidity conditions. Our work provides an oxide/perovskite heterojunction avenue to further increase the efficiency and stability of PSCs.
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