Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The analysis of double injection current transients is one of the most often used technique for the estimation of charge carriers mobilities and recombination rates in the bulk heterojunction solar cells. From the current transients charge carriers mobilities could be estimated and from the saturation current value – reduction coefficient of Langevin recombination. Due to the complex multilayered structure of the perovskite solar cell interpretation double injection current transients is problematic. Appling charge carriers extraction by linearly increasing voltage (CELIV) method also encounters certain problems: the distribution of electrical field is not clear, moreover, due to the built in potential and difference in HOMO and LUMO levels the redistribution of photogenerated charge carriers takes place and estimation of recombination rate and mechanism is complicated or impossible. Separate measurements in the perovskite solar cells layers could give errors in mobility values due to different thicknesses and crystallinities.
In this work we analysing how in the case of double injection, charge carriers, electrical field are distributed and how recombination is influencing current transient. The modelling of the double injection current transients demonstrated that charge carriers accumulate in the perovskite layer and distributions are influenced by the transient times and recombination coefficient. The saturation current is mainly determined by the space charge limited current and influence of recombination is quite weak. Slow increase of the current towards saturation is observed experimentally and could be linked to trapping of charge carriers. For the estimation of recombination rate in perovskite layer we used CELIV technique after end of injection.
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