Light-Induced Defect Generation in CH3NH3PbI3 Thin Films and Single Crystals

Jörg Rappich, Felix Lang, Viktor V. Brus, Oleksandra Shargaieva, Thomas Dittrich, Norbert H. Nickel

Research output: Contribution to journalArticlepeer-review

Abstract

In a period of only a few years, the power conversion efficiency of organic–inorganic perovskite solar cells has surpassed a value of 24.2%. However, a major drawback is the lack of long-term stability, which is partially related to the dissociation of organic cations under prolonged illumination. This degradation mechanism is not limited to ambient temperatures. At low temperatures (T = 5 K), illumination of methyl ammonium lead iodide (CH3NH3PbI3) thin films with a photon energy of Eph = 3.4 eV results in the formation of localized trap states located about 100 meV within the bandgap. These light-induced defects are metastable, and annealing at T ≥ 15 K removes the localized states. Defect creation is not limited to polycrystalline perovskites but is also observed in single-crystal CH3NH3PbI3. The experimental data are discussed in terms of a two-level model where the metastable state is separated from the annealed state by an energy barrier.

Original languageEnglish
Article number1900216
JournalSolar RRL
Volume4
Issue number2
DOIs
Publication statusPublished - Feb 1 2020
Externally publishedYes

Keywords

  • CHNHPbI
  • light-induced defect generation
  • low temperature
  • perovskite
  • single crystal

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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