Imperial College London
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ProfessorAronWalsh

Faculty of Engineering, Department of Materials

Chair in Materials Design
 
 
 
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Contact

 

+44 (0)20 7594 1178a.walsh Website

 
 
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Location

 

2.10Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Simenas:2020:10.1038/s41467-020-18938-z,
author = {Simenas, M and Balciunas, S and Wilson, JN and Svirskas, S and Kinka, M and Garbaras, A and Kalendra, V and Gagor, A and Szewczyk, D and Sieradzki, A and Maczka, M and Samulionis, V and Walsh, A and Grigalaitis, R and Banys, J},
doi = {10.1038/s41467-020-18938-z},
journal = {Nature Communications},
title = {Suppression of phase transitions and glass phase signatures in mixed cation halide perovskites},
url = {http://dx.doi.org/10.1038/s41467-020-18938-z},
volume = {11},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Cation engineering provides a route to control the structure and properties of hybrid halide perovskites, which has resulted in the highest performance solar cells based on mixtures of Cs, methylammonium, and formamidinium. Here, we present a multi-technique experimental and theoretical study of structural phase transitions, structural phases and dipolar dynamics in the mixed methylammonium/dimethylammonium MA1-xDMAxPbBr3 hybrid perovskites (0 ≤ x ≤ 1). Our results demonstrate a significant suppression of the structural phase transitions, enhanced disorder and stabilization of the cubic phase even for a small amount of dimethylammonium cations. As the dimethylammonium concentration approaches the solubility limit in MAPbBr3, we observe the disappearance of the structural phase transitions and indications of a glassy dipolar phase. We also reveal a significant tunability of the dielectric permittivity upon mixing of the molecular cations that arises from frustrated electric dipoles.
AU  - Simenas,M
AU  - Balciunas,S
AU  - Wilson,JN
AU  - Svirskas,S
AU  - Kinka,M
AU  - Garbaras,A
AU  - Kalendra,V
AU  - Gagor,A
AU  - Szewczyk,D
AU  - Sieradzki,A
AU  - Maczka,M
AU  - Samulionis,V
AU  - Walsh,A
AU  - Grigalaitis,R
AU  - Banys,J
DO  - 10.1038/s41467-020-18938-z
PY  - 2020///
SN  - 2041-1723
TI  - Suppression of phase transitions and glass phase signatures in mixed cation halide perovskites
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/s41467-020-18938-z
UR  - https://www.ncbi.nlm.nih.gov/pubmed/33037192
UR  - http://hdl.handle.net/10044/1/83868
VL  - 11
ER  -
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