Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface

被引：75

作者：

Chen, Shi ^{[1
]}

Goh, Teck Wee ^{[1
]}

Sabba, Dharani ^{[2
,3
]}

Chua, Julianto ^{[2
,3
]}

Mathews, Nripan ^{[2
,3
]}

Huan, Cheng Hon Alfred ^{[1
,4
]}

Sum, Tze Chien ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore

[2] Nanyang Technol Univ, ERIN, Energy Res Inst, Singapore 637553, Singapore

[3] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[4] Inst High Performance Comp, Singapore 138632, Singapore

来源：

APL MATERIALS | 2014年 / 2卷 / 08期

基金：

新加坡国家研究基金会;

关键词：

ORGANOMETAL HALIDE PEROVSKITES; SENSITIZED SOLAR-CELLS; COPPER PHTHALOCYANINE; ELECTRONIC-STRUCTURE; PHOTOEMISSION-SPECTROSCOPY; ORGANIC HETEROJUNCTION; PHOTOVOLTAIC CELLS; HIGH-EFFICIENCY; DEPOSITION; LENGTHS;

D O I：

10.1063/1.4889844

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The energy level alignment at the CH3NH3PbI3/copper phthalocyanine (CuPc) interface is investigated by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). XPS reveal a 0.3 eV downward band bending in the CuPc film. UPS validate this finding and further reveal negligible interfacial dipole formation - verifying the viability of vacuum level alignment. The highest occupied molecular orbital of CuPc is found to be closer to the Fermi level than the valance band maximum of CH3NH3PbI3, facilitating hole transfer from CH3NH3PbI3 to CuPc. However, subsequent hole extraction from CuPc may be impeded by the downward band bending in the CuPc layer. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

引用

页数：7

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