Cited 0 time in
Cited 0 time in
Ternary diagrams of the phase, optical bandgap energy and photoluminescence of mixed-halide perovskites
- Ternary diagrams of the phase, optical bandgap energy and photoluminescence of mixed-halide perovskites
- Kim, Se-Yun; Lee, Ho-Chang; Nam, Yujin; Yun, Yeonghun; Lee, Si Hong; Kim, Dong Hoe; Noh, Jun Hong; Lee, Joon-Hyung; Kim, Dae-Hwan; Lee, Sangwook; Heo, Young-Woo
- DGIST Authors
- Kim, Dae-Hwan
- Issue Date
- Acta Materialia, 181, 460-469
- Article Type
- Author Keywords
- Mixed halide perovskite; Ternary phase diagram; Lattice constant; Bandgap energy; Photoluminescence
- Halide perovskites attract enormous attention as promising light absorption and emission materials for photovoltaics and optoelectronic applications. Here we report ternary diagrams of the phase, optical bandgap energy (Eg) and photoluminescence intensity of methylammonium lead halide (MAPbX3, where X = I, Br and Cl) perovskites, with three vertices of MAPbI3, MAPbBr3 and MAPbCl3. All the compositions were synthesized via a facile mechanochemical reaction at room temperature, to ensure the desired stoichiometries of the final products. Through structural study on MAPbX3, the phase diagram comprising a single phase region and two multi-phase regions was obtained. In the single phase region, the a-axis lattice constant increases almost linearly with increasing the average size of the X site ions. Interestingly, Eg decreases almost linearly with increasing the average size of the X site ions, giving negligible deviation from Vegard's law. As the result, a certain bandgap value, in the range of 1.55 - 2.9 eV, can be easily designed with infinite numbers of compositions. For the last, the ternary diagram of the photoluminescence intensity reveals the effective compositions for red, green and blue light emission. The comprehensive structural and optical information reported in this study is useful for designing halide perovskites for various applications. In addition, our approach for compositional mapping various characteristics using a solid-state reaction is an efficient and robust way to studying halide perovskites. © 2019 Acta Materialia Inc.
- Elsevier BV
- Related Researcher
There are no files associated with this item.
- Division of Energy Technology1. Journal Articles
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.