Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO22)
DOI: https://doi.org/10.29363/nanoge.nipho.2022.008
Publication date: 11th November 2021
Energetic disorder in crystalline and amorphous solids is composed of static (structural) and dynamic (vibrational) disorder. The latter depends on phonon occupation and hence scales with the temperature. The temperature dependence of energetic disorder can be described within the framework of Einstein solid model. Temperature-dependent inverse slope of the logarithm of absorption spectrum (Urbach energy) is required to determine these components and to obtain the static disorder. With recent advances in the sensitivity of photocurrent spectroscopy methods providing signal to noise ratios exceeding 90 dB, we determined temperature dependent Urbach energy in lead halide perovskites containing different number of cation components. Urbach energies are obtained with a precision of approximately 1 meV dictated by inevitable optical interference. Using a single mode vibrational solid model we obtain static energetic disorder of 7.1±0.6 meV and 7.3±0.3 meV for single and triple cation perovskites respectively and 5.0±1.7 meV for the double cation system. These value are close to but not smaller than that in inorganic compound semiconductors such as III-V compounds. We also reveal the contribution of mid-gap trap states in the sub-gap quantum efficiency spectra with spectral line shapes heavily affected by the optical interference and hence providing no information about the energy or distribution of the trap states in contrast to previous reports.
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