Efficient Semitransparent\nSolar Cells Enabled by Introducing <i>N</i>‑Ethylbenzylamine\nAdditives into Thin Layer of Halide\nPerovskites

Semitransparent perovskite solar cells (ST-PSCs) have\nopened up\nnew applications in tandem devices and building-integrated photovoltaics.\nDecreasing the thickness of the perovskite film makes it feasible\nto fabricate semitransparent perovskite layers. However, the formation\nof high-quality thin perovskite films has been a challenge during\nthe film manufacturing process since the crystallization dynamics\nof thinner (<200 nm) films are different from that of thick films.\nIn this article, we demonstrate a feasible method to fabricate a thinner\nlayer of highly crystalline perovskites with low defect density for\nefficient ST-PSCs by introducing N-Ethylbenzylamine (EBA) to modify\nhalide perovskites through Lewis acid–base interaction. As\na result, a semitransparent solar cell based on EBA-treated perovskite\nwith a film thickness of only ∼190 nm exhibits a high power\nconversion efficiency (PCE) of 14.77%, an average visible transmittance\n(AVT) of 13.2%, and an excellent light utilization efficiency (LUE)\nof 1.95%, which is the highest value in the ST-PSCs with Au as the\nelectrode. Our findings highlight the effectiveness of the EBA additive\nin improving the photovoltaic performance of ST-PSCs, offering valuable\ninsights into developing efficient and transparent photovoltaic technologies.