基于柠檬酸钠掺杂SnO_(2)的钙钛矿太阳能电池

Perovskite Solar Cells Based on Sodium Citrate Doped SnO_(2)

针对商用SnO_(2)水分散液易发生颗粒团聚的问题和提升SnO_(2)薄膜电学和表面性能的需求,提出了一种利用小分子螯合剂对SnO_(2)进行优化的策略。该策略选用低成本的螯合剂柠檬酸钠(SC:Sodium Citrate)对SnO_(2)传输层进行掺杂,制备的器件结构为ITO/SnO_(2)+SC/FA_(1-x)MA_(x)PbI_(3)/Spiro-OMeTAD/Au的PSCs。在引入浓度经过优化的SC后,PSCs的开路电压和填充因子最高可达1.135 V和78.23%,能量转换效率为21.53%,与未引入SC的器件相比获得了明显提升。对薄膜和器件进行表征后发现,SC的掺杂可提升SnO_(2)薄膜的电学和表面性能,进而改善了钙钛矿的结晶。对集成的器件进行表征发现缺陷密度降低,载流子复合引起的电压和填充因子损失减少,电荷传输的效率得到明显改善。

Currently,SnO_(2)(Tin Dioxide) has become the most commonly used material for the electron transport layer in high-performance PSCs(Perovskite Solar Cells).A strategy for optimizing SnO_(2) using a small-molecule chelator is proposed to address the problem of agglomeration-prone commercial SnO_(2) aqueous dispersions and the need to enhance the electrical and surface properties of SnO_(2) films.The PSCs with the device structure of ITO/SnO_(2)+SC/FA_(1-x)MA_(x)PbI_(3)/Spiro-OMeTAD/Au are prepared by doping the SnO_(2) transport layer with a low-cost chelator,SC(Sodium Citrate).After the introduction of SC with an optimized concentration,the open-circuit voltage and fill factor of PSCs can reach up to 1.135 V and 78.23%,respectively,with a power conversion efficiency of 21.53%.This represents a significant improvement compared to the devices without the introduction of SC.The characterization of the films and devices revealed that the doping of SC could enhance the electrical and surface properties of the SnO_(2) films,which in turn improves perovskite crystallization.As a result,defects in the device are reduced,recombination loss is lowered,and charge transport is promoted.