Abstract

Relieving unwanted strain Although the α-phase of formamidinium lead iodide (FAPbI 3 ) has a suitable bandgap for use in solar cells, it must be stabilized with additional cations. These compositions can adversely affect the bandgap and produce lattice strain that creates trap sites for charge carriers. Kim et al. found that substituting small, equimolar amounts of cesium and methylenediammonium cations for formamidinium reduced the lattice strain and trap densities. The enhancement in open-circuit voltage led to a certified power conversion efficiency of 24.4%, and encapsulated devices retained 90% of their initial efficiency after 400 hours of maximal power point operating conditions. Science , this issue p. 108

Keywords

FormamidiniumIodideHalidePerovskite (structure)Energy conversion efficiencyCaesiumBand gapMaterials scienceChemistryIodineAnalytical Chemistry (journal)Inorganic chemistryOptoelectronicsCrystallography

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Publication Info

Year
2020
Type
article
Volume
370
Issue
6512
Pages
108-112
Citations
1251
Access
Closed

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Cite This

Gwisu Kim, Hanul Min, Kyoung Su Lee et al. (2020). Impact of strain relaxation on performance of α-formamidinium lead iodide perovskite solar cells. Science , 370 (6512) , 108-112. https://doi.org/10.1126/science.abc4417

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DOI
10.1126/science.abc4417