This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1038/s41467-020-20066-7 in citations.
Please use the identifier: http://hdl.handle.net/2128/27249 in citations.
Strain-activated light-induced halide segregation in mixed-halide perovskite solids
Strain-activated light-induced halide segregation in mixed-halide perovskite solids
Light-induced halide segregation limits the bandgap tunability of mixed-halide perovskites for tandem photovoltaics. Here we report that light-induced halide segregation is strain-activated in MAPb(I1−xBrx)3 with Br concentration below approximately 50%, while it is intrinsic for Br concentration ov...
Saved in:
Personal Name(s): | Zhao, Yicheng |
---|---|
Miao, Peng / Elia, Jack / Hu, Huiying / Wang, Xiaoxia / Heumueller, Thomas / Hou, Yi / Matt, Gebhard J. / Osvet, Andres / Chen, Yu-Ting / Tarragó, Mariona / de Ligny, Dominique / Przybilla, Thomas / Denninger, Peter / Will, Johannes / Zhang, Jiyun / Tang, Xiaofeng / Li, Ning / He, Chenglin / Pan, Anlian / Meixner, Alfred J. / Spiecker, Erdmann / Zhang, Dai / Brabec, Christoph J. (Corresponding author) | |
Contributing Institute: |
Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien; IEK-11 |
Published in: | Nature Communications, 11 (2020) 1, S. 6328 |
Imprint: |
[London]
Nature Publishing Group UK
2020
|
DOI: |
10.1038/s41467-020-20066-7 |
Document Type: |
Journal Article |
Research Program: |
Solar cells of the next generation |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/27249 in citations.
Light-induced halide segregation limits the bandgap tunability of mixed-halide perovskites for tandem photovoltaics. Here we report that light-induced halide segregation is strain-activated in MAPb(I1−xBrx)3 with Br concentration below approximately 50%, while it is intrinsic for Br concentration over approximately 50%. Free-standing single crystals of CH3NH3Pb(I0.65Br0.35)3 (35%Br) do not show halide segregation until uniaxial pressure is applied. Besides, 35%Br single crystals grown on lattice-mismatched substrates (e.g. single-crystal CaF2) show inhomogeneous segregation due to heterogenous strain distribution. Through scanning probe microscopy, the above findings are successfully translated to polycrystalline thin films. For 35%Br thin films, halide segregation selectively occurs at grain boundaries due to localized strain at the boundaries; yet for 65%Br films, halide segregation occurs in the whole layer. We close by demonstrating that only the strain-activated halide segregation (35%Br/45%Br thin films) could be suppressed if the strain is properly released via additives (e.g. KI) or ideal substrates (e.g. SiO2). |