Surface Electronic Structure of Hybrid Organo Lead Bromide Perovskite Single Crystals

Takashi Komesu, Xin Huang, Tula R. Paudel, Yaroslav B. Losovyj, Xin Zhang, Eike F. Schwier, Yohei Kojima, Mingtian Zheng, Hideaki Iwasawa, Kenya Shimada, Makhsud I. Saidaminov, Dong Shi, Ahmed L. Abdelhady, Osman Bakr, Shuai Dong, Evgeny Y. Tsymbal, Peter A. Dowben

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

The electronic structure and band dispersion of methylammonium lead bromide, CH3NH3PbBr3, has been investigated through a combination of angle-resolved photoemission spectroscopy (ARPES) and inverse photoemission spectroscopy (IPES), as well as theoretical modeling based on density functional theory. The experimental band structures are consistent with the density functional calculations. The results demonstrate the presence of a dispersive valence band in MAPbBr3 that peaks at the M point of the surface Brillouin zone. The results also indicate that the surface termination of the CH3NH3PbBr3 is the methylammonium bromide (CH3NH3Br) layer. We find our results support models that predict a heavier hole effective mass in the region of -0.23 to -0.26 me, along the Γ (surface Brillouin center) to M point of the surface Brillouin zone. The surface appears to be n-type as a result of an excess of lead in the surface region. © 2016 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)21710-21715
Number of pages6
JournalThe Journal of Physical Chemistry C
Volume120
Issue number38
DOIs
StatePublished - Sep 12 2016

Fingerprint

Dive into the research topics of 'Surface Electronic Structure of Hybrid Organo Lead Bromide Perovskite Single Crystals'. Together they form a unique fingerprint.

Cite this