Triple-halide wide-band gap perovskites with suppressed phase segregation for efficient tandems

Wide-band gap metal halide perovskites are promising semiconductors to pair with silicon in tandem solar cells to pursue the goal of achieving power conversion efficiency (PCE) greater than 30% at low cost. However, wide-band gap perovskite solar cells have been fundamentally limited by photoinduced...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2020-03, Vol.367 (6482), p.1097-1104
Main Authors: Xu, Jixian, Boyd, Caleb C, Yu, Zhengshan J, Palmstrom, Axel F, Witter, Daniel J, Larson, Bryon W, France, Ryan M, Werner, Jérémie, Harvey, Steven P, Wolf, Eli J, Weigand, William, Manzoor, Salman, van Hest, Maikel F A M, Berry, Joseph J, Luther, Joseph M, Holman, Zachary C, McGehee, Michael D
Format: Article
Language:English
Subjects:
Bromine
Carrier mobility
Chlorine
Current carriers
Efficiency
Electrons
Energy conversion efficiency
Energy gap
Fabrication
Halide perovskites
Halides
Illumination
Iodine
Luminous intensity
MATERIALS SCIENCE
Maximum power
Metal halides
Open circuit voltage
Perovskites
Photovoltaic cells
power conversion efficiency
semiconductors
Silicon
Solar cells
SOLAR ENERGY
tandem solar cells
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Summary:Wide-band gap metal halide perovskites are promising semiconductors to pair with silicon in tandem solar cells to pursue the goal of achieving power conversion efficiency (PCE) greater than 30% at low cost. However, wide-band gap perovskite solar cells have been fundamentally limited by photoinduced phase segregation and low open-circuit voltage. We report efficient 1.67-electron volt wide-band gap perovskite top cells using triple-halide alloys (chlorine, bromine, iodine) to tailor the band gap and stabilize the semiconductor under illumination. We show a factor of 2 increase in photocarrier lifetime and charge-carrier mobility that resulted from enhancing the solubility of chlorine by replacing some of the iodine with bromine to shrink the lattice parameter. We observed a suppression of light-induced phase segregation in films even at 100-sun illumination intensity and less than 4% degradation in semitransparent top cells after 1000 hours of maximum power point (MPP) operation at 60°C. By integrating these top cells with silicon bottom cells, we achieved a PCE of 27% in two-terminal monolithic tandems with an area of 1 square centimeter.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.aaz5074