Dharani Sabba, Dewi Herlina Arianita, Prabhakar Rajiv Ramanujam, Baikie Tom, Shi Chen, Yonghua Du, Mathews Nripan, Boix Pablo P, Mhaisalkar Subodh G
School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore.
Nanoscale. 2014 Nov 21;6(22):13854-60. doi: 10.1039/c4nr04007d.
Organic-inorganic lead halide perovskites have been widely used as absorbers on mesoporous TiO2 films as well as thin films in planar heterojunction solar cells, yielding very high photovoltaic conversion efficiencies. Both the addition of chloride and sequential deposition methods were successfully employed to enhance the photovoltaic performance. Here, both approaches are combined in a sequential method by spincoating PbCl2 + PbI2 on a mesoporous TiO2 film followed by the perovskite transformation. The role of Cl in determining the optical, electrical, structural and morphological properties is correlated with the photovoltaic performance. The highest photovoltaic efficiency of 14.15% with the V(oc), FF and J(sc) being 1.09 V, 0.65 and 19.91 mA cm(-2) respectively was achieved with 10 mol% of PbCl2 addition due to an increase of the film conductivity induced by a better perovskite morphology. This is linked to an improvement of the hysteresis and reproducibility of the solar cells.
有机-无机铅卤化物钙钛矿已被广泛用作介孔TiO2薄膜以及平面异质结太阳能电池薄膜中的吸收剂，产生了非常高的光伏转换效率。氯化物的添加和顺序沉积方法都成功用于提高光伏性能。在此，通过在介孔TiO2薄膜上旋涂PbCl2 + PbI2，然后进行钙钛矿转化，将这两种方法以顺序法结合起来。Cl在决定光学、电学、结构和形态性质方面的作用与光伏性能相关。由于更好的钙钛矿形态导致薄膜电导率增加，添加10 mol%的PbCl2时实现了最高光伏效率14.15%，V(oc)、FF和J(sc)分别为1.09 V、0.65和19.91 mA cm(-2)。这与太阳能电池滞后现象和重现性的改善有关。
