Influence of a UV-ozone treatment on amorphous SnO2 electron selective layers for highly efficient planar MAPbI3 perovskite solar cells
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第24期
论文作者：Kyungeun Jung Du Hyeon Kim Jaemin Kim Sunglim Ko Jae Won Choi Ki Chul Kim Sang-Geul Lee Man-Jong Lee
文章页码：195 - 202
摘 要：The effect of ultraviolet-ozone（UVO） irradiation on amorphous（am） Sn O2 and its impact on the photoconversion efficiency of MAPb I3-based perovskite solar cells were investigated in detail. UVO treatment was found to increase the amount of chemisorbed oxygen on the am-Sn O2 surface, reducing the surface energy and contact angle. Physicochemical changes in the am-Sn O2 surface lowered the Gibbs free energy for the densification of perovskite films and facilitated the formation of homogeneous perovskite grains. In addition, the Fermi energy of the UVO-treated am-Sn O2 shifted upwards to achieve an ideal band offset for MAPb I3, which was verified by theoretical calculations based on the density functional theory. We achieved a champion efficiency of 19.01 % with a statistical reproducibility of 17.01 ± 1.34 %owing to improved perovskite film densification and enhanced charge transport/extraction, which is considerably higher than the 13.78 ± 2.15 % of the counterpart. Furthermore, UVO-treated, am-Sn O2-based devices showed improved stability and less hysteresis, which is encouraging for the future application of up-scaled perovskite solar cells.
Kyungeun Jung1，Du Hyeon Kim2，Jaemin Kim3，Sunglim Ko3，Jae Won Choi4，Ki Chul Kim4，Sang-Geul Lee5，Man-Jong Lee2,1
1. Department of Advanced Technology Fusion, Konkuk University2. Department of Chemistry, Konkuk University3. Department of Mechanical Design and Production Engineering, Konkuk University4. Division of Chemical Engineering, Konkuk University5. Daegu Center, Korea Basic Science Institute
摘 要：The effect of ultraviolet-ozone（UVO） irradiation on amorphous（am） Sn O2 and its impact on the photoconversion efficiency of MAPb I3-based perovskite solar cells were investigated in detail. UVO treatment was found to increase the amount of chemisorbed oxygen on the am-Sn O2 surface, reducing the surface energy and contact angle. Physicochemical changes in the am-Sn O2 surface lowered the Gibbs free energy for the densification of perovskite films and facilitated the formation of homogeneous perovskite grains. In addition, the Fermi energy of the UVO-treated am-Sn O2 shifted upwards to achieve an ideal band offset for MAPb I3, which was verified by theoretical calculations based on the density functional theory. We achieved a champion efficiency of 19.01 % with a statistical reproducibility of 17.01 ± 1.34 %owing to improved perovskite film densification and enhanced charge transport/extraction, which is considerably higher than the 13.78 ± 2.15 % of the counterpart. Furthermore, UVO-treated, am-Sn O2-based devices showed improved stability and less hysteresis, which is encouraging for the future application of up-scaled perovskite solar cells.
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