Air Stable, High‐Efficiency, Pt‐Based Halide Perovskite Solar Cells with Long Carrier Lifetimes. Issue 8 (29th May 2020)

• Record Type: Journal Article
• Authors: Schwartz, Dakota; Murshed, Rubaiya; Larson, Harry; Usprung, Benedikt; Soltanmohamad, Sina; Pandey, Ramesh; Barnard, Edward S.; Rockett, Angus; Hartmann, Thomas; Castelli, Ivano E.; Bansal, Shubhra
• Is Part Of: Physica status solidi. Volume 14:Issue 8(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-05-29
• Subjects: air‐stable solar cells -- Cs2PtI6 -- halide perovskite solar cells -- Pb‐free perovskites -- device stability; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202000182
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : The search for Pb‐free perovskite materials continues with limited success to find a suitable replacement for Pb with outstanding optoelectronic properties. Herein, Pb‐free inorganic halide perovskite Cs2 PtI6 with excellent absorption coefficient, long minority carrier lifetime, and optical bandgap of 1.4 eV is reported. Atmospheric precursor‐based solution processing results in high‐quality Cs2 PtI6 with absorption coefficient of 4 × 10 5 cm − 1 for photon energies of >1.5 eV and high minority carrier lifetimes of >2 μs indicating low defect density in the material. Superstrate n–i–p solar cells processed with the structure F:SnO2 /CdS/Cs2 PtI6 /carbon/Cu show promising device efficiency of 13.88%. These planar devices processed under atmospheric conditions show low V oc deficit (<0.3 V) without any hysteresis in forward and reverse scans indicating low trap densities. Pt offers an excellent model system for the replacement of Pb due to high atomic number, oxidation resistance, and stability. Cs2 PtI6 is an atmospherically stable phase under AM1.5G at 65 °C for 1000 h. Abstract : Cs2 PtI6 with bandgap of 1.4 eV is shown to be promising Pb‐free material for perovskite solar cells. These thin films show a carrier lifetime of >2 μs, absorption coefficient of 4 × 10 5 cm − 1, and superior thermal and atmospheric stability. A superstrate planar n–i–p device with an efficiency of 13.88% and low V oc deficit is demonstrated by solution processing.