Browsing by Author "Liu, Shengzhong (Frank)"

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    High efficiency planar-type perovskite solar cells with negligible hysteresis using EDTA-complexed SnO2
    Yang, Dong; Yang, Ruixia; Wang, Kai; Wu, Congcong; Zhu, Xuejie; Feng, Jiangshan; Ren, Xiaodong; Fang, Guojia; Priya, Shashank; Liu, Shengzhong (Frank) (Springer Nature, 2018-08-13)
    Even though the mesoporous-type perovskite solar cell (PSC) is known for high efficiency, its planar-type counterpart exhibits lower efficiency and hysteretic response. Herein, we report success in suppressing hysteresis and record efficiency for planar-type devices using EDTA-complexed tin oxide (SnO2) electron-transport layer. The Fermi level of EDTA-complexed SnO2 is better matched with the conduction band of perovskite, leading to high open-circuit voltage. Its electron mobility is about three times larger than that of the SnO2. The record power conversion efficiency of planar-type PSCs with EDTA-complexed SnO2 increases to 21.60% (certified at 21.52% by Newport) with negligible hysteresis. Meanwhile, the low-temperature processed EDTA-complexed SnO2 enables 18.28% efficiency for a flexible device. Moreover, the unsealed PSCs with EDTA-complexed SnO2 degrade only by 8% exposed in an ambient atmosphere after 2880 h, and only by 14% after 120 h under irradiation at 100 mW cm−2.