期刊
APPLIED PHYSICS LETTERS
卷 105, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4897329
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资金
- NSF [ECCS-1232067, CBET-1336134]
- Iowa Energy Center
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1336134] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1507291, 1232067] Funding Source: National Science Foundation
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.
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