Defect density and dielectric constant in perovskite solar cells
2014; American Institute of Physics; Volume: 105; Issue: 15 Linguagem: Inglês
10.1063/1.4897329
ISSN1520-8842
AutoresMehran Samiee, Siva Konduri, Ganapathy Balaji, Ranjith Kottokkaran, Hisham A. Abbas, Andrew R. Kitahara, Pranav Joshi, Liang Zhang, Max Noack, Vikram L. Dalal,
Tópico(s)Conducting polymers and applications
ResumoWe 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.
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