Abstract
The attractive optoelectronic properties of MAPbI(3) (MA = CH3NH3), one of the most common halide perovskites, can be complicated by its tetragonal -> cubic structural phase transition just above room temperature. We show that decreasing the ambient pressure can move that phase transition by similar to 40 degrees C (at , similar to 10(-3) mbar). Our report also includes control experiments, which show that desorption of water or oxygen can be excluded as possible causes for the change in phase transition temperature. On the basis of diffraction data, we postulate that an optimum volume is required to initiate a T -> C phase transition. The pressure-induced phase change in effect stabilizes the tetragonal phase for work around room temperature, even if some natural heating occurs.
| Original language | English |
|---|---|
| Pages (from-to) | 1473-1476 |
| Number of pages | 4 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 11 |
| Issue number | 4 |
| Early online date | 30 Jan 2020 |
| DOIs | |
| Publication status | Published - 20 Feb 2020 |
Funding
The authors thank Ministry of New and Renewable Energy, Government of India for the financial support. We also thank IIT-Bombay Central Facility for XRD measurements.
All Science Journal Classification (ASJC) codes
- General Materials Science
- Physical and Theoretical Chemistry