Surface Termination of Solution-Processed CH3NH3PbI3 Perovskite Film Examined Using Electron Spectroscopies

[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 CH3NH3PbI3 perovskite film. The results show that the surface of the CH3NH3PbI3 perovskite film is terminated with a layer consisting of CH3NH3 and I. The interface energy level alignment for both occupied and unoccupied levels between CH3NH3PbI3 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.

https://opac.ll.chiba-u.jp/da/curator/900121227/

https://opac.ll.chiba-u.jp/da/curator/900121227/accepted manuscript(Habir Adv Mater 2020).pdf

Wiley

Journal Article

Advanced Materials

33

3

2004981

2021-01-19

https://doi.org/10.1002/adma.202004981

eng

https://doi.org/10.1002/adma.202004981

author

This is the peer reviewed version of the following article:Mirzehmet, A., Ohtsuka, T., Abd. Rahman, S. A., Yuyama, T., Krüger, P., Yoshida, H., Surface Termination of Solution-Processed CH3NH3PbI3 Perovskite Film Examined using Electron Spectroscopies. Adv. Mater. 2021, 33, 2004981, which has been published in final form at https://doi.org/10.1002/adma.202004981 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.