Surface Electronic Structure of Hybrid Organo Lead Bromide Perovskite Single Crystals

被引：59

作者：

Komesu, Takashi ^{[1
]}

Huang, Xin ^{[1
,2
]}

Paudel, Tula R. ^{[1
]}

Losovyj, Yaroslav B. ^{[3
]}

Zhang, Xin ^{[1
]}

Schwier, Eike F. ^{[4
]}

Kojima, Yohei ^{[5
]}

Zheng, Mingtian ^{[5
]}

Iwasawa, Hideaki ^{[4
]}

Shimada, Kenya ^{[4
]}

Saidaminov, Makhsud I. ^{[6
]}

Shi, Dong ^{[6
]}

Abdelhady, Ahmed L. ^{[6
]}

Bakr, Osman M. ^{[6
]}

Dong, Shuai ^{[2
]}

Tsymbal, Evgeny Y. ^{[1
]}

Dowben, Peter A. ^{[1
]}

机构：

[1] Univ Nebraska, Dept Phys & Astron, Jorgensen Hall,855 North 16th St, Lincoln, NE 68588 USA

[2] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

[3] Indiana Univ, Dept Chem, A421C 800 E Kirkwood Ave, Bloomington, IN 47405 USA

[4] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7390046, Japan

[5] Hiroshima Univ, Grad Sch Sci, Higashihiroshima 7398526, Japan

[6] KAUST, KAUST Solar Ctr, Div Phys Sci & Engn, Thuwal 239556900, Saudi Arabia

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2016年 / 120卷 / 38期

基金：

美国国家科学基金会;

关键词：

OPTICAL-PROPERTIES; SOLAR-CELLS; CH3NH3PBX3; X; DIFFUSION; EFFICIENT; SPECTROSCOPY; DEPENDENCE; TRANSPORT; DYNAMICS; LENGTHS;

D O I：

10.1021/acs.jpcc.6b08329

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 MAPbBr(3) that peaks at the (M) over bar 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 m(e) along the (Gamma) over bar (surface Brillouin center) to (M) over bar 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.

引用

页码：21710 / 21715

页数：6

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