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

Unger, E. L. LU ; Kegelmann, Lukas; Suchan, K. LU ; Sörell, D.; Korte, Lars and Albrecht, Susanne (2017) In Journal of Materials Chemistry A 5(23). p.11401-11409
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Materials Chemistry A
volume
5
issue
23
pages
9 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85021706092
  • wos:000403228200002
ISSN
2050-7488
DOI
10.1039/c7ta00404d
language
English
LU publication?
yes
id
f57dd666-ea70-444e-9e91-9d45e4f626e6
date added to LUP
2017-07-20 08:46:27
date last changed
2018-11-18 04:57:10
@article{f57dd666-ea70-444e-9e91-9d45e4f626e6,
  abstract     = {<p>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 FA<sub>0.75</sub>Cs<sub>0.25</sub>Sn<sub>0.5</sub>Pb<sub>0.5</sub>I<sub>3</sub> with an absorption onset of 1.2 eV, to high bandgap compounds, such as CsPbBr<sub>3</sub> 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.</p>},
  author       = {Unger, E. L. and Kegelmann, Lukas and Suchan, K. and Sörell, D. and Korte, Lars and Albrecht, Susanne},
  issn         = {2050-7488},
  language     = {eng},
  number       = {23},
  pages        = {11401--11409},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of Materials Chemistry A},
  title        = {Roadmap and roadblocks for the band gap tunability of metal halide perovskites},
  url          = {http://dx.doi.org/10.1039/c7ta00404d},
  volume       = {5},
  year         = {2017},
}