Perovskite‐based solar cells currently are one of the most rapidly developing fields in solar photovoltaics. Chemical doping of perovskites with foreign atoms is a promising way to tailor material properties toward improving the performance and stability of solar cells. Herein, efficiency enhancement of planar MAPbI₃ perovskite solar cells by doping them with 0.1–5% Sr²⁺ is discussed. A small amount (<1%) of Sr²⁺ added to the perovskite improves the V_oc by ≈80 mV and consequently increases the power conversion efficiency (PCE) from 16.8% to 17.8%. Using transient photoluminescence, transient photocurrent, and time‐delayed collection field measurements, it is demonstrated that Sr²⁺ additives reduce the trap density and increase the perovskite photoluminescence lifetime. However, reaching ≈1% concentration, Sr²⁺ additives create additional carrier traps, which cause fast photoluminescence quenching and slow carrier recombination.

中文翻译：

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Sr2 +掺杂抑制MAPbI3钙钛矿中电子的俘获

基于钙钛矿的太阳能电池目前是太阳能光伏领域中发展最快的领域之一。用外来原子对钙钛矿进行化学掺杂是一种有前途的方式，可以调整材料的性能，以改善太阳能电池的性能和稳定性。本文讨论了通过掺杂0.1-5％Sr ²⁺来提高平面MAPbI ₃钙钛矿太阳能电池的效率。添加到钙钛矿中的少量Sr 2 ⁺（<1％）可使V _oc升高约80 mV，从而将功率转换效率（PCE）从16.8％提高到17.8％。使用瞬态光致发光，瞬态光电流和延时收集场测量，证明了Sr ²⁺添加剂降低了陷阱密度并增加了钙钛矿的光致发光寿命。但是，Sr ²⁺添加剂的浓度达到≈1％时，会形成额外的载流子陷阱，从而导致快速的光致发光猝灭和缓慢的载流子重组。