Jump to main content
Jump to site search


Roadmap and roadblocks for the band gap tunability of metal halide perovskites

Author affiliations

Abstract

Solar cells based on metal-halide perovskite semiconductors inspire high hopes for efficient low cost solar cell technology. This material class exhibits a facile tunability of the band gap making them interesting for multi-junction device technology. We here compare and highlight trends in the band gap tunability and device performance metrics in reported metal halide perovskite alloys of a wide compositional range from low band gap compounds, such as FA0.75Cs0.25Sn0.5Pb0.5I3 with an absorption onset of 1.2 eV, to high bandgap compounds, such as CsPbBr3 with an absorption onset close to 2.4 eV. In between, metal halide perovskites can seemingly be seamlessly tuned by compositional engineering. However, mixed bromide–iodide compounds with band gaps above 1.7 eV often exhibit photo-induced phase segregation inducing domains with lower band gaps that emit photons of low energy. This effect also reduces the photoluminescence quantum yield and hence the maximum open circuit voltage achievable in devices. This highlight summarizes general trends for metal halide perovskites with respect to their absorption onset. Furthermore recent progress as well as possible roadblocks for the band gap tunability of metal halide perovskites are highlighted as this is of particular importance for the development of multifunction solar cell technology.

Graphical abstract: Roadmap and roadblocks for the band gap tunability of metal halide perovskites

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 12 Jan 2017, accepted on 29 Mar 2017 and first published on 29 Mar 2017


Article type: Highlight
DOI: 10.1039/C7TA00404D
Citation: J. Mater. Chem. A, 2017, Advance Article
  •   Request permissions

    Roadmap and roadblocks for the band gap tunability of metal halide perovskites

    E. L. Unger, L. Kegelmann, K. Suchan, D. Sörell, L. Korte and S. Albrecht, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA00404D

Search articles by author