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Surface Termination of Solution‐Processed CH 3 NH 3 PbI 3 Perovskite Film Examined using Electron Spectroscopies
Author(s) -
Mirzehmet Abduheber,
Ohtsuka Tomoki,
Abd. Rahman Syed A.,
Yuyama Tomoki,
Krüger Peter,
Yoshida Hiroyuki
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202004981
Subject(s) - x ray photoelectron spectroscopy , perovskite (structure) , ultraviolet photoelectron spectroscopy , materials science , perovskite solar cell , spectroscopy , photoemission spectroscopy , electron spectroscopy , analytical chemistry (journal) , chemistry , crystallography , layer (electronics) , nanotechnology , chemical engineering , physics , quantum mechanics , chromatography , engineering
Abstract The interfaces of a perovskite solar cell significantly influence the charge processes in the cell, which contributes to the device performance with direct implication for surface potential, electronic structure, and chemical reactivity. The properties of the interface are strongly affected by the surface termination. In this work, the combination of ultraviolet photoelectron spectroscopy (UPS) and metastable‐atom electron spectroscopy is demonstrated, to examine the surface termination of a solution‐processed CH 3 NH 3 PbI 3 perovskite film. The results show that the surface of the CH 3 NH 3 PbI 3 perovskite film is terminated with a layer consisting of CH 3 NH 3 and I. The interface energy level alignment for both occupied and unoccupied levels between CH 3 NH 3 PbI 3 and C60 is also examined using UPS and low‐energy inverse photoelectron spectroscopy. It turns out that an ideal energy level alignment is established for the electron collection and hole block at the perovskite and C60 interface.