Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.259
Publication date: 6th July 2018
The high performance of recently emerged lead halide perovskite-based photovoltaic
devices has been attributed to remarkable carrier properties in this kind of material:
long carrier diffusion length, long carrier lifetime, and low electron-hole recombination
rate. However, the mechanism of the charge separation is still not fully understood. In my talk, it will be demonstrated that the charge separation is induced by the structural fluctuation of the inorganic lattice using first-principles molecular dynamics simulations [1]. On the other hand, charge carrier trapping at defects on surfaces or grain boundaries is detrimental for the performance of perovskite solar cells. In practice, it is one of the main limiting factors for carrier lifetime. Surface defects responsible for carrier trapping are clarified by comprehensive first-principles investigations and it is proposed that PbI2-rich condition is preferred to MAI-rich one, while intermediate condition has possibility to be the best choice [2].
References
[1] H. Uratani and K. Yamashita, J. Phys. Chem. C, 121, 26648−26654 (2017).
[2] H. Uratani and K. Yamashita, J. Phys. Chem. Lett., 8, 742−746 (2017).
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