Two-Dimensional Hybrid Organohalide Perovskites from Ultrathin PbS Nanocrystals as Template
- Indian Association for the Cultivation of Science, Kolkata (India)
- Indian Inst. of Science, Bangalore (India)
- Saha Inst. of Nuclear Physics, Kolkata (India)
- Illinois Inst. of Technology, Chicago, IL (United States)
- Indian Association for the Cultivation of Science, Kolkata (India); Indian Inst. of Science, Bangalore (India); Council of Scientific and Industrial Research-Network of Institutes for Solar Energy (CSIR-NISE), New Delhi (India)
Direct conversion of preprocessed binary semiconductor NCs as template holds the key toward the shape control of hybrid perovskites. Here we report on an innovative route for realizing shape-controlled hybrid organohalide perovskite NCs from two-dimensional PbS NCs on solid substrates. Rectangular PbI2 NCs are first synthesized by iodination of PbS NCs. Resultant PbI2 NCs are subsequently transformed into the well-defined rectangular hybrid perovskite NCs upon controlled CH3NH3Br exposure. Structural analyses using X-ray absorption fine structure reveal transition of cubic lattice of PbS to hybrid perovskites with a mixture of cubic and tetragonal phases exhibiting a bimodal distribution of shorter Pb–Br and longer Pb–I bonds around an immediate neighboring lead absorber within the first coordination shell. Furthermore, this direct all anion exchange reaction route opens up new strategies for the fabrication of shape-controlled perovskite NCs on flexible substrates from suitable existing binary NCs as template for optoelectronic applications.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-06CH11357; DMR-086935
- OSTI ID:
- 1393646
- Journal Information:
- Journal of Physical Chemistry. C, Vol. 121, Issue 11; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
Web of Science
High luminescence color gradient by physical mixing of two perovskite nanocrystals
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journal | January 2019 |
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