Control and Study of the Stoichiometry in Evaporated Perovskite Solar Cells

Joel Teuscher, Alexey Ulianov, Othmar Muentener, Michael Graetzel, Nicolas Tetreault

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Herein, we present the precise stoichiometric control of methlyammonium lead iodide perovskite thin-films using high vacuum dual-source vapor-phase deposition. We found that UV/Vis absorption and emission spectra were inadequate for assessing precisely the perovskite composition. Alternatively, inductively coupled plasma mass spectrometry (ICP-MS) is used to give precise, reproducible, quantitative measurements of the I/Pb ratio without systematic errors that often result from varying device thicknesses and morphologies. This controlled deposition method enables better understanding of the evaporation and deposition processes; methylammonium iodide evaporation appears omnidirectional, controlled using the chamber pressure and incorporated in the film through interaction with the unidirectionally evaporated PbI2. Furthermore, these thin-films were incorporated into solar cell device architectures with the best photovoltaic performance and reproducibility obtained for devices made with stoichiometric perovskite active layers. Additionally, and particularly pertinent to the field of perovskite photovoltaics, we found that the I-V hysteresis was unaffected by varying the film stoichiometry.
Original languageEnglish (US)
Pages (from-to)3847-3852
Number of pages6
JournalCHEMSUSCHEM
Volume8
Issue number22
DOIs
StatePublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Energy(all)
  • Environmental Chemistry
  • Materials Science(all)
  • Chemical Engineering(all)

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