AI Article Synopsis
- * At room temperature, two phonon modes in the tetragonal phase split into four distinct modes when cooled to the orthorhombic phase, indicating a phase transition that we analyze using the Lorentz model.
- * Our findings show that the calculated carrier mobility from low-temperature phonon modes aligns well with previous experimental measurements, suggesting a connection between these phonon modes and the efficiency of perovskite solar cells.
Article Abstract
We study the temperature-dependent phonon modes of the organometallic lead iodide perovskite CH3NH3PbI3 thin film across the terahertz (0.5-3 THz) and temperature (20-300 K) ranges. These modes are related to the vibration of the Pb-I bonds. We found that two phonon modes in the tetragonal phase at room temperature split into four modes in the low-temperature orthorhombic phase. By use of the Lorentz model fitting, we analyze the critical behavior of this phase transition. The carrier mobility values calculated from the low-temperature phonon mode frequencies, via two theoretical approaches, are found to agree reasonably with the experimental value (∼2000 cm(2) V(-1) s(-1)) from a previous time-resolved THz spectroscopy work. Thus, we have established a possible link between terahertz phonon modes and the transport properties of perovskite-based solar cells.
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| http://dx.doi.org/10.1021/acs.jpclett.5b02223 | DOI Listing |
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