Defect density and dielectric constant in perovskite solar cells

被引：225

作者：

Samiee, Mehran ^{[1
]}

Konduri, Siva ^{[1
]}

Ganapathy, Balaji ^{[2
]}

Kottokkaran, Ranjith ^{[2
]}

Abbas, Hisham A. ^{[1
]}

Kitahara, Andrew ^{[3
]}

Joshi, Pranav ^{[1
]}

Zhang, Liang ^{[1
]}

Noack, Max ^{[2
]}

Dalal, Vikram ^{[1
]}

机构：

[1] Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA

[2] Iowa State Univ, Microelect Res Ctr, Ames, IA 50011 USA

[3] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 15期

基金：

美国国家科学基金会;

关键词：

LOW-COST; STATES;

D O I：

10.1063/1.4897329

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on measurement of dielectric constant, mid-gap defect density, Urbach energy of tail states in CH3NH3PbIxCl1-x perovskite solar cells. Midgap defect densities were estimated by measuring capacitance vs. frequency at different temperatures and show two peaks, one at 0.66 eV below the conduction band and one at 0.24 eV below the conduction band. The attempt to escape frequency is in the range of 2 X 10(11)/s. Quantum efficiency data indicate a bandgap of 1.58 eV. Urbach energies of valence and conduction band are estimated to be similar to 16 and similar to 18 meV. Measurement of saturation capacitance indicates that the relative dielectric constant is similar to 18. (C) 2014 AIP Publishing LLC.

引用

页数：4

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