Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 6, Pages 1368-1373Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b00138
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Funding
- Czech Science Foundation - European Structural and Investment Funds [17-26041Y]
- Czech Ministry of Education, Youth and Sports [CZ.02.1.01/0.0/0.0/16_019/0000760, CZ.02.1.01/0.0/0.0/15_003/0000464]
- King Abdullah University of Science and Technology (KAUST) [OSR-CARF URF/1/3079-33-01]
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To gain insight into the properties of photovoltaic and light-emitting materials, detailed information about their optical absorption spectra is essential. Here, we 6- elucidate the temperature dependence of such spectra for methylammonium lead iodide (CH3NH3PbI3), with specific attention to its sub-band gap absorption edge (often termed Urbach energy). On the basis of these data, we first find clear further evidence for the universality of the correlation between the Urbach energy and open-circuit voltage losses of solar cells. Second, we find that for CH3NH3PbI3 the static, temperature-independent, contribution of the Urbach energy is 3.8 +/- 0.7 meV, which is smaller than that of crystalline silicon (Si), gallium arsenide (GaAs), indium phosphide (InP), or gallium nitride (GaN), underlining the remarkable optoelectronic properties of perovskites.
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