Correlation of elastic and optoelectronic properties near structural phase transition in organic-inorganic lead iodide perovskite single crystals
| Autor: | Oleg E. Tereshchenko, I. V. Zhevstovskikh, M. N. Sarychev, Olga I Semenova, N. S. Averkiev, V. A. Golyashov |
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| Rok vydání: | 2020 |
| Předmět: |
Photocurrent
Phase transition Photoluminescence Materials science business.industry Exciton 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Phase (matter) 0103 physical sciences Optoelectronics General Materials Science 010306 general physics 0210 nano-technology business Elastic modulus Perovskite (structure) |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal. 33(4) |
| ISSN: | 1361-648X |
| Popis: | The experimental evidence of the influence of the structural phase transition on the elastic and optoelectronic properties of CH3NH3PbI3 single crystals has been reported. A peak in the attenuation for longitudinal and shear ultrasonic waves and a step-like anomaly in their velocity have been found near the structural the orthorhombic-to-tetragonal phase transition (160 K). The narrow hysteresis observed in the temperature dependences of the elastic properties confirms that this is the first-order phase transition. A redshift of the absorption threshold (of about 110 meV) has been revealed both in the photocurrent (PC) and in the photoluminescence (PL) spectra with increasing temperature from 140 to 160 K. In the orthorhombic phase of CH3NH3PbI3 single crystals, the fine exciton structure in the PC spectrum has been found with an exciton binding energy of 19–25 meV. The peculiarities of the PC and PL spectra near the phase transition temperature (160 K) have been observed within a wider temperature range in contrast to the elastic anomalies that can be explained by the complex structure of the near-surface region. It may be essential for the further development of optoelectronic devices based on hybrid halide perovskites. |
| Databáze: | OpenAIRE |
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