Defect density and dielectric constant in perovskite solar cells

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 conduc...

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Bibliographic Details
Published in:Applied physics letters 2014-10, Vol.105 (15)
Main Authors: Samiee, Mehran, Konduri, Siva, Ganapathy, Balaji, Kottokkaran, Ranjith, Abbas, Hisham A., Kitahara, Andrew, Joshi, Pranav, Zhang, Liang, Noack, Max, Dalal, Vikram
Format: Article
Language:English
Subjects:
Applied physics
CAPACITANCE
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Conduction bands
CRYSTAL DEFECTS
Defects
DENSITY
Energy gap
EV RANGE
PERMITTIVITY
PEROVSKITE
Perovskites
Photovoltaic cells
QUANTUM EFFICIENCY
SATURATION
SOLAR CELLS
VALENCE
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Summary: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 × 1011/s. Quantum efficiency data indicate a bandgap of 1.58 eV. Urbach energies of valence and conduction band are estimated to be ∼16 and ∼18 meV. Measurement of saturation capacitance indicates that the relative dielectric constant is ∼18.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4897329