Abstract
The band alignments at the interface of ZnO/HC(NH2)2PbI3 (FAPbI3) heterojunction were measured by X-ray photoelectron spectroscopy. Core levels of Pb 5d and Zn 3d were utilized to align the valence-band offset (VBO). The VBO was determined to be 1.86±0.30eV, and the conduction-band offset (CBO) was concluded to be 0.05±0.30eV, manifesting that the ZnO/FAPbI3 heterojunction has a type-I band alignment. The data of the band alignment of ZnO/FAPbI3 heterojunction may benefit the design and development of novel perovskite solar cells (PSCs).
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