Abstract
Research on low-temperature electron transport materials in perovskite solar cells has been pursued to expand their application on flexible and tandem device architectures. The traditional TiO2 electron transport material has low electron mobility, resulting in sever charge accumulation at the interface. Here, PCBM is applied as buffer layer to increase the electron extraction rate and suppress charge accumulation, as well as modify the interface of the electron transport layer. The authors find that perovskite layer exhibits better morphology with PCBM buffer layer, and the solar cell presents improved performance, which makes the low-temperature prepared TiO2 film a promising electron transport material for perovskite solar cells.
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