TY - JOUR
T1 - Light-induced lattice expansion leads to high-efficiency perovskite solar cells
AU - Tsai, Hsinhan
AU - Asadpour, Reza
AU - Blancon, Jean Christophe
AU - Stoumpos, Constantinos C.
AU - Durand, Olivier
AU - Strzalka, Joseph W.
AU - Chen, Bo
AU - Verduzco, Rafael
AU - Ajayan, Pulickel M.
AU - Tretiak, Sergei
AU - Even, Jacky
AU - Alam, Muhammad Ashraf
AU - Kanatzidis, Mercouri G.
AU - Nie, Wanyi
AU - Mohite, Aditya D.
N1 - Funding Information:
Funding: The work at LANL was supported by the Laboratory Directed Research and Development (LDRD) Directed Research (DR) project. The XPS analyses were done in Shared Equipment Authority (SEA) and were supported by Rice University. The GIWAXS maps were done at sector 8-ID-E of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract DE-AC02-06CH11357. Work at Northwestern was supported by the U.S. Department of Energy, Office of Science (grant SC0012541, structure characterization). A.D.M. acknowledges support by Office of Energy Efficiency and Renewable Energy grant DE-FOA-0001647-1544 for this work. Author contributions: W.N., H.T., and A.D.M. conceived the idea, designed experiments, and co-wrote the manuscript. H.T. fabricated and characterized the thin films and devices and analyzed data under the supervision of W.N. and A.D.M. C.C.S. and M.G.K. performed crystallography analysis of the powder diffraction and calculated the molecular structures. J.-C.B. conducted the optical spectroscopy measurements on the thin film and analyzed the data. R.A. performed device modeling simulations and analyzed simulation data with M.A.A., who conceived and supervised the device modeling. J.W.S. helped with GIWAXS experiment setup, and O.D. analyzed the GIWAXS data. B.C., R.V., and P.M.A. helped with XPS experiments and analyses. S.T. and J.E. were involved in discussion. All authors have read the manuscript and agree to its contents. Competing interests: None declared. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the supplementary materials.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
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U2 - 10.1126/science.aap8671
DO - 10.1126/science.aap8671
M3 - Article
C2 - 29622649
AN - SCOPUS:85045020499
VL - 360
SP - 67
EP - 70
JO - Science
JF - Science
SN - 0036-8075
IS - 6384
ER -