Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.041
Publication date: 21st November 2018
Methylammonium lead triiodide perovskite (MAPbI3) semiconductor displays outstanding photovoltaic and light emitting properties. Recently a new property was uncovered, revealing striking features of the transient photoluminescence in perovskite layers [1]. The application of bias voltage can eliminate the luminescence in lateral interdigitated electrode devices under light soaking. Using a wide-field PL imaging microscope it was observed that the PL is progressively suppressed showing a sharp advancing front that moves advances from the positive electrode at a slow velocity of order of 10 mm s-1. We present a model of ion-induced doping modification governed by local saturation effect `[Li, C.; Guerrero, A.; Hüttner, S.; Bisquert, J. Nat. Commun. 2018.] We have shown that the dominant electrical current flowing across the symmetrical electrodes, is an electronic current. The applied voltage induces an ion movement and influences the majority carrier density turning the material more intrinsic-like and thus the total current changes with time (decreases for p-doped material). The excess iodine vacancies lead to redox reactions as for example in which interstitial Pb2+ is reduced to Pb(0), leading to severe nonradiative recombination that suppresses PL. Significantly, we show that the electron and hole concentration alters with the drift of vacancies under application of an electric field. This insight leads to a direct determination of the diffusion coefficient of iodine vacancies from the measured current and provides detailed information and control on the effect of ionic conduction over the electrooptical properties of hybrid perovskite materials. We also show the identification of the impedance of ionic diffusion by measuring single crystal samples [2].
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