Perovskite solar cells (PSCs) are becoming a promising candidate for next-generation photovoltaic cells due to their attractive power conversion efficiency (PCE). Plasmonic enhancement is regarded as an optical tuning approach for further improving the PCE of single-junction PSCs toward Shockley-Queisser limit. Herein, we introduce molecularly isolated gold nanorods (Au NRs), bearing relatively stronger scattering ability and localized surface plasmonic resonance (LSPR) effect, in the rear side of perovskites in PSCs, for promoting light harvesting and for electrical enhancement. Owing to the larger refractive index and better matched energy level alignment, the 4-mercaptobenzoic acid molecules coated on Au NRs prove to play important dual roles: isolating the metallic Au NRs from contacting with perovskite, and facilitating more efficient charge separation and transport across the interface under the synergetic LSPR effect of Au NRs. Our work highlights the capability of the plasmonic approach by nanorods and by molecular isolation, extending nanoparticle-based plasmonic approaches, toward highly efficient plasmon-enhanced PSCs.

钙钛矿太阳能电池 (PSC) 因其具有吸引力的功率转换效率 (PCE) 而成为下一代光伏电池的有希望的候选者。等离子体增强被认为是一种光学调谐方法，可进一步提高单结 PSC 的 PCE 向 Shockley-Queisser 极限。在此，我们在 PSC 中钙钛矿的背面引入了分子分离的金纳米棒 (Au NR)，它具有相对较强的散射能力和局部表面等离子体共振 (LSPR) 效应，用于促进光收集和电增强。由于更大的折射率和更好的匹配能级排列，涂在 Au NRs 上的 4-巯基苯甲酸分子被证明具有重要的双重作用：隔离金属 Au NRs 与钙钛矿接触，并在 Au NR 的协同 LSPR 效应下促进更有效的电荷分离和跨界面传输。我们的工作强调了通过纳米棒和分子分离的等离子体方法的能力，将基于纳米粒子的等离子体方法扩展到高效的等离子体增强 PSC。