绝缘氧化物包覆对钙钛矿太阳电池性能及界面电荷复合动力学的影响

采用浸渍法对钙钛矿太阳电池的介孔层TiO₂纳米颗粒进行了SiO₂、ZrO₂、Al₂O₃几种绝缘氧化物包覆,研究了其对电池光伏性能以及界面电荷复合动力学的影响。结果表明, SiO₂包覆之后,电池的填充因子(FF)从67.6%提高到72.3%,光电转换效率提升到13.7%, ZrO₂和Al₂O₃包覆导致电池开路电压提升约50mV,但是短路电流(J_sc)和填充因子略有下降。采用纳秒时间尺度的瞬态吸收光谱技术,从时间分辨的角度分析了钙钛矿电池界面的电子和空穴的复合寿命,对电池性能的变化给出了合理的解释。

Influence of Insulating Oxide Coatings on the Performance of Perovskite Solar Cells and the Interface Charge Recombination Dynamics

Insulating oxides of SiO₂, ZrO₂, and Al₂O₃ were coated using a dipping method on the surface of mesoporous TiO₂ nanoparticles for perovskite solar cells. The effects of the insulating oxide coatings on the performance of the perovskite solar cells and the interface charge recombination dynamics were investigated in detail. The efficiency of devices after SiO₂ coating improved by 13.7% due to their FF (fill factor) increasing from 67.6% to 72.3%. However, the devices with ZrO₂ and Al₂O₃ coatings exhibited an increase in V_oc of up to 50 mV and a decrease in J_sc and FF. Transient absorption spectroscopy on a timescale from nanoseconds to milliseconds was performed to study the interface recombination lifetime between electrons and holes and the changes of the device performances are discussed.