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Size-dependent phase transition in methylammonium lead iodide perovskite microplate crystals

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms11330· OSTI ID:1270965
 [1];  [2];  [3];  [4];  [3];  [3];  [5];  [2]
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry; Univ. of California, Los Angeles, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry, CA Nanosystems Inst.
  3. Univ. of California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering
  4. Univ. of California, Los Angeles, CA (United States). Dept. of Chemistry and Biochemistry
  5. Univ. of California, Los Angeles, CA (United States). CA Nanosystems Inst., Dept. of Materials Science and Engineering

Methylammonium lead iodide perovskite has attracted considerable recent interest for solution processable solar cells and other optoelectronic applications. The orthorhombic-to-tetragonal phase transition in perovskite can significantly alter its optical, electrical properties and impact the corresponding applications. Here, we report a systematic investigation of the size-dependent orthorhombic-to-tetragonal phase transition using a combined temperature-dependent optical, electrical transport and transmission electron microscopy study. Our studies of individual perovskite microplates with variable thicknesses demonstrate that the phase transition temperature decreases with reducing microplate thickness. The sudden decrease of mobility around phase transition temperature and the presence of hysteresis loops in the temperature-dependent mobility confirm that the orthorhombic-to-tetragonal phase transition is a first-order phase transition. Lastly, our findings offer significant fundamental insight on the temperature-and size-dependent structural, optical and charge transport properties of perovskite materials, and can greatly impact future exploration of novel electronic and optoelectronic devices from these materials.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0008055
OSTI ID:
1270965
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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