A two-layer structured PbI2 thin film for efficient planar perovskite solar cells
A two-layer structured PbI2 thin film for efficient planar perovskite solar cells
复制标题
用于高效平面钙钛矿太阳能电池的双层结构 PbI2 薄膜
作者：
Ying Chao;Shi Chengwu;Wu Ni;Zhang Jincheng;Wang Mao
在本文中，一个两层结构的PbI 2薄膜构造的旋涂程序使用0.80 M的PbI 2的DMF溶液和随后的近距离真空热蒸发使用PbI 2粉末作为源。底部PbI 2薄膜是紧凑的，具有片状外观，平行于FTO衬底，并且可以容易地转化为紧凑的钙钛矿薄膜，以抑制TiO 2导带的电子和螺-OMeI价带的空穴的电荷复合。顶部PbI 2薄膜是多孔的，具有纳米片阵列，垂直于FTO衬底，并且可以容易地转化为多孔钙钛矿薄膜，以改善从钙钛矿到螺-OMeO 2的空穴迁移以及钙钛矿/螺-OMeO 2界面处的电荷分离。基于两层结构的PbI 2薄膜的平面钙钛矿太阳能电池表现出11.64%的光电转换效率，沿着具有0.90 V的开路电压、19.29 mA cm-2的短路光电流密度和0.67的填充因子。
In this paper, a two-layer structured PbI2 thin film was constructed by the spin-coating procedure using a 0.80 M PbI2 solution in DMF and subsequent close-spaced vacuum thermal evaporation using PbI2 powder as a source. The bottom PbI2 thin film was compact with a sheet-like appearance, parallel to the FTO substrate, and can be easily converted to a compact perovskite thin film to suppress the charge recombination of the electrons of the TiO2 conduction band and the holes of the spiro-OMeTAD valence band. The top PbI2 thin film was porous with nano-sheet arrays, perpendicular to the FTO substrate, and can be easily converted to a porous perovskite thin film to improve the hole migration from the perovskite to spiro-OMeTAD and the charge separation at the perovskite/spiro-OMeTAD interface. The planar perovskite solar cells based on the two-layer structured PbI2 thin film exhibited a photoelectric conversion efficiency of 11.64%, along with an open-circuit voltage of 0.90 V, a short-circuit photocurrent density of 19.29 mA cm−2 and a fill factor of 0.67.