Relationship between Lattice Strain and Efficiency for Sn-Perovskite Solar Cells

ACS Applied Materials & Interfaces
Kohei NishimuraShuzi Hayase

Abstract

In the composition of Q0.1(FA0.75MA0.25)0.9SnI3, Q is replaced with Na+, K+, Cs+, ethylammonium+ (EA+), and butylammonium+ (BA+), respectively, and the relationship between actually measured lattice strain and photovoltaic performances is discussed. The lattice strain evaluated by the Williamson-hall plot of X-ray diffraction data decreased as the tolerance factor was close to one. The efficiency of the Sn-perovskite solar cell was enhanced as the lattice strain decreased. Among them, EA0.1(FA0.75MA0.25)0.9SnI3 having lowest lattice strain gave the best result of 5.41%. Because the carrier mobility increased with a decrease in the lattice strain, these lattice strains would disturb carrier mobility and decrease the solar cell efficiency. Finally, the results that the efficiency of the SnGe-perovskite solar cells was gradually enhanced from 6.42 to 7.60% during storage, was explained by the lattice strain relaxation during the storage.

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Citations

May 11, 2021·The Journal of Physical Chemistry Letters·Chengbo LiFeng Hao
Sep 18, 2021·Nature Materials·Dongtao LiuWei Zhang
Oct 10, 2021·Advanced Materials·Matteo PitaroMaria Antonietta Loi

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