All Publications

  • Defect-Induced Band-Edge Reconstruction of a Bismuth-Halide Double Perovskite for Visible-Light Absorption JOURNAL OF THE AMERICAN CHEMICAL SOCIETY Slavney, A. H., Leppert, L., Bartesaghi, D., Gold-Parker, A., Toney, M. F., Savenije, T. J., Neaton, J. B., Karunadasa, H. I. 2017; 139 (14): 5015-5018


    Halide double perovskites have recently been developed as less toxic analogs of the lead perovskite solar-cell absorbers APbX3 (A = monovalent cation; X = Br or I). However, all known halide double perovskites have large bandgaps that afford weak visible-light absorption. The first halide double perovskite evaluated as an absorber, Cs2AgBiBr6 (1), has a bandgap of 1.95 eV. Here, we show that dilute alloying decreases 1's bandgap by ca. 0.5 eV. Importantly, time-resolved photoconductivity measurements reveal long-lived carriers with microsecond lifetimes in the alloyed material, which is very promising for photovoltaic applications. The alloyed perovskite described herein is the first double perovskite to show comparable bandgap energy and carrier lifetime to those of (CH3NH3)PbI3. By describing how energy- and symmetry-matched impurity orbitals, at low concentrations, dramatically alter 1's band edges, we open a potential pathway for the large and diverse family of halide double perovskites to compete with APbX3 absorbers.

    View details for DOI 10.1021/jacs.7b01629

    View details for Web of Science ID 000399353800009

    View details for PubMedID 28353345

  • Chlorine in PbCl2-Derived Hybrid-Perovskite Solar Absorbers CHEMISTRY OF MATERIALS Pool, V. L., Gold-Parker, A., McGehee, M. D., Toney, M. F. 2015; 27 (21): 7240-7243
  • Chloride in Lead Chloride-Derived Organo-Metal Halides for Perovskite-Absorber Solar Cells CHEMISTRY OF MATERIALS Unger, E. L., Bowring, A. R., Tassone, C. J., Pool, V. L., Gold-Parker, A., Cheacharoen, R., Stone, K. H., Hoke, E. T., Toney, M. F., McGehee, M. D. 2014; 26 (24): 7158-7165

    View details for DOI 10.1021/cm503828b

    View details for Web of Science ID 000347139700031