In this work, we demonstrate that high efficient hybrid organic/inorganic perovskite PHJ solar cell can be fabricated by inserting an ultrathin polyelectrolyte layer, either ethoxylated polye t hyle ni mi ne (PEIE) or poly [3-(6-trimethylammoniumhexyl)thiophene] (P3TMAHT). Both layers are processed from methanol on top of PCBM and beneath the Ag electrode. The power conversion efficiency (PCE) increases from 8.53% to 12.01% (PEIE) and 11.28% (P3TMAHT) for the solution-processed polyelectrolyte- modified interfaces. The creation of a surface dipole between PCBM and Ag electrode opens up an alternative pathway to engineer the interface of hybrid organic/inorganic perovskite PHJ solar cells. It is noteworthy to mention that the identical strategy was successfully demonstrated for organic solar cells.
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