MODIFICATION OF RHEOLOGY ALLOWS HIGH EFFICIENT INVERTED PLANAR PEROVSKITE SOLAR CELL VIA SLOT-DIE PROCESS
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초록
내용
In recent years, high-efficiency perovskite solar cells (PSCs) are tremendous attention as one of the most promising and encouraging energy sources. However, the sensitive nucleation growth and crystallization process of PSCs still limits the fabrication of large-area PSCs with high efficiency. In this study, we have tried to use a cost-effective additive acting as a rheological modifier to tailor the viscosity of perovskite precursors, which allowed to control nucleation growth and crystallization process of the perovskite film without post-treatment. This approach made straightforwardly deposition in one step slot-die technique at the ambient environment, resulting in a uniform and large grain size of perovskite films with high-throughput processing. By modification of rheology of perovskite precursor, we obtained high power conversion efficiency (PCE) of 19.47% and retained over 90% efficiency of more than 1000 h.