Temperature Dependence of the Urbach Energy in Lead Iodide Perovskites

Martin Ledinsky, Tereza Schönfeldová, Jakub Holovský, Erkan Aydin, Zdeňka Hájková, Lucie Landová, Neda Neyková, Antonín Fejfar, Stefaan De Wolf

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

To gain insight into the properties of photovoltaic and light-emitting materials, detailed information about their optical absorption spectra is essential. Here, we 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.
Original languageEnglish (US)
Pages (from-to)1368-1373
Number of pages6
JournalThe Journal of Physical Chemistry Letters
Volume10
Issue number6
DOIs
StatePublished - Mar 6 2019

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