Correlated Electrical and Chemical Nanoscale Properties in Potassium-Passivated, Triple-Cation Perovskite Solar Cells
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Authors
Publication Date
2020-09Journal Title
Advanced Materials Interfaces
ISSN
2196-7350
Publisher
Wiley
Type
Article
This Version
AM
Metadata
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Tennyson, B., Abdi-Jalebi, M., Ji, K., Garrett, J., Gong, C., Pawlicki, A., Ovchinnikova, O., et al. (2020). Correlated Electrical and Chemical Nanoscale Properties in Potassium-Passivated, Triple-Cation Perovskite Solar Cells. Advanced Materials Interfaces https://doi.org/10.1002/admi.202000515
Abstract
Perovskite semiconductors are an exciting class of materials due to their
promising performance outputs in optoelectronic devices. To boost their
efficiency further, researchers introduce additives during sample synthesis, such as KI. However, it is not well understood how KI changes the material
and, often, leaves precipitants. To fully resolve the role of KI, a multiple
microscopy techniques is applied and the electrical and chemical behavior of a Reference (untreated) and a KI-treated perovskite are compared. Upon correlation between electrical and chemical nanoimaging techniques, it is discovered that these local properties are linked to the macroscopic voltage enhancement of the KI-treated perovskite. The heterogeneity revealed in both the local electrical and chemical responses indicates that the additive partially migrates to the surface, yet surprisingly; does not deteriorate the performance locally, rather, the voltage response homogeneously increases. The research presented within provides a diagnostic methodology, which connects the nanoscale electrical and chemical properties of materials, relevant to other perovskites, including multication and Pb-free alternatives.
Sponsorship
University of Maryland All-S.T.A.R. Fellowship
Hulka Energy Research Fellowship
National Science Foundation
US Department of Energy
The Royal Society
Office of Naval Research
Funder references
Royal Society (UF150033)
Engineering and Physical Sciences Research Council (EP/R023980/1)
Engineering and Physical Sciences Research Council (EP/M005143/1)
Identifiers
External DOI: https://doi.org/10.1002/admi.202000515
This record's URL: https://www.repository.cam.ac.uk/handle/1810/306948
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