Light-induced lattice expansion leads to high-efficiency perovskite solar cells

Hsinhan Tsai, Reza Asadpour, Jean Christophe Blancon, Constantinos C. Stoumpos, Olivier Durand, Joseph W. Strzalka, Bo Chen, Rafael Verduzco, Pulickel M. Ajayan, Sergei Tretiak, Jacky Even, Muhammad Ashraf Alam, Mercouri G. Kanatzidis, Wanyi Nie, Aditya D. Mohite

Research output: Contribution to journalArticlepeer-review

420 Citations (Scopus)


Light-induced structural dynamics plays a vital role in the physical properties, device performance, and stability of hybrid perovskite-based optoelectronic devices. We report that continuous light illumination leads to a uniform lattice expansion in hybrid perovskite thin films, which is critical for obtaining high-efficiency photovoltaic devices. Correlated, in situ structural and device characterizations reveal that light-induced lattice expansion benefits the performances of a mixed-cation pure-halide planar device, boosting the power conversion efficiency from 18.5 to 20.5%.The lattice expansion leads to the relaxation of local lattice strain, which lowers the energetic barriers at the perovskite-contact interfaces, thus improving the open circuit voltage and fill factor. The light-induced lattice expansion did not compromise the stability of these high-efficiency photovoltaic devices under continuous operation at full-spectrum 1-sun (100 milliwatts per square centimeter) illumination for more than 1500 hours.

Original languageEnglish
Pages (from-to)67-70
Number of pages4
Issue number6384
Publication statusPublished - 2018
Externally publishedYes


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