在电子传输层中掺杂二氧化钛纳米粒子来提高反式钙钛矿太阳电池的效率

基于CH3NH3PbX3 (X=Cl, Br, or I)材料的钙钛矿太阳电池由于其简单的制作工艺和较高的光电转化效率在近年来吸引了大量的研究。该文报道了在电子传输层（PCBM层）中掺杂二氧化钛纳米粒子从而提高了反式结构钙钛矿太阳电池的性能。通过掺杂二氧化钛纳米粒子，使电子传输层的能级和钙钛矿层的能级更加匹配，从而改善了电子的传输和收集并抑制了正负电荷复合，提高了钙钛矿太阳电池的短路电流密度和填充因子。光电转化效率从原来的12.1%提高到了13.5%。我们的结果表明，在PCBM层掺杂二氧化钛纳米粒子是一种简单有效的提高钙钛矿太阳电池的性能的方法。

IMPROVEMENT OF INVERTED PEROVSKITE SOLAR CELLS USING TITANIUM OXIDE NANO-PARTICLES DOPED ELECTRON TRANSPORT LAYER

CH3NH3PbX3 (X=Cl, Br, or I) based perovskite solar cells have attracted great attention due to the simple processing and high performance. In this work, we investigated the effect of doping titanium oxide nano-particles (TiO2 NPs) into the electron transport layer (PCBM) of inverted perovskite solar cells. By using TiO2 NPs, the work functions of perovskite solar cells were more matched, improving the electron transportation and collection. We improved the power conversion efficiency of perovskite solar cells from 12.1% to 13.5%, with enhanced short circuit current density and fill factor. The improved perovskite solar cells showed almost no hysteresis. Our results indicate that, doping titanium oxide nano-particles (TiO2 NPs) into PCBM layer is a simple and effective way for developing high performance perovskite solar cells.