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Control and Study of the Stoichiometry in Evaporated Perovskite Solar Cells

Control and Study of the Stoichiometry in Evaporated Perovskite Solar Cells

Joël Teuscher, Alexey Ulianov, Othmar Müntener, Michael Grätzel, Nicolas Tétreault

ChemSusChem. 2015 Nov;8(22):3847-52.

PMID: 26471762

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7720834	Titanium(IV) iodide		7720-83-4	Price

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