Publication date: 8th January 2019
Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted great attention due to their excellent photovoltaic performances, such as high absorption coefficient, high charge carrier mobility and long diffusion length, rising up the power conversion efficiency (PCE) up to 23.2% in the recent years [1]. The role of charge selective contacts on the operation mechanisms of PSCs in completely not clearly. This contacts have been demonstrated to be crucial, in particular, in the stability of the device, currently the main challenge of this technology [2]. Impedance Spectroscopy is one of the most useful technique to acquire a wide amount of information about transport and recombination mechanisms [3]. In this work, we investigate the influence of the selective contact thickness through Cyclic Voltammetry (CV) and Impedance Spectroscopy (IS) measurements. We observed that thinker layers improves the behaviour of the cell by blocking the charge transfer trough pin holes; On the other hand, making it too thick can dramatically limit the performance of the solar cells.
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