Surface treatment of Mixed-Halide CsPb(BrxI1-x)(3) perovskite quantum dots for thermal stability enhancement
- Authors
- Huynh, Kim Anh; Van Nguyen, Tuan; Bae, Sa-Rang; Do, Ha Huu; Heo, Do Yeon; Quyet Van Le; Jang, Ho Won; Ahn, Sang Hyun; Kim, Soo Young
- Issue Date
- 2월-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Citation
- MATERIALS RESEARCH BULLETIN, v.146
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS RESEARCH BULLETIN
- Volume
- 146
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135234
- DOI
- 10.1016/j.materresbull.2021.111622
- ISSN
- 0025-5408
- Abstract
- In this study, the thermal stability of mixed-halide CsPb(BrxI1-x)(3) perovskite quantum dots was investigated by monitoring its absorption, photoluminescence spectra, and X-ray diffraction. CsPb(Br0.8I0.2)(3) was found to be the most stable composition at a constant temperature of 100 degrees C for up to 96 h, although some agglomeration was observed. In contrast, CsPb(Br0.2I0.8)(3) revealed the most unstable composition under the same conditions as the aggregated iodide-rich domain easily transformed into the yellow-colored, non-luminescent delta-phase. CsPb(Br0.5I0.5)(3) also showed phase segregation, where its original phase separated into bromide-rich and iodide-rich domains. By passivating the surface of mixed-halide perovskite, the particle agglomeration of CsPb(Br0.8I0.2)(3) and phase segregation of CsPb(Br0.5I0.5)(3) were significantly suppressed; however, the prevention of CsPb(Br0.2I0.8)(3) phase transformation was less successful.
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