钛掺杂钙钛矿制备高效率钙钛矿太阳能电池（英文）

Ti^(4+) Doped Perovskite for Efficient Perovskite Solar Cells by Grain Boundary Passivation

采用钛离子掺杂钙钛矿薄膜的方法修饰钙钛矿晶界缺陷。研究表明钛离子富集在晶界处,有效地钝化了晶界缺陷,同时有助于连续、平整、高质量薄膜的形成。经过钛离子掺杂后的钙钛矿太阳能电池电流(JSC)达到22.3 mA·cm^(-2),开路电压(VOC)达1.1 V,填充因子(FF)高达72.4%,光电转换效率(PCE)优化至17.4%,远高于未掺杂钙钛矿太阳能电池。

The grain boundaries defect is solved by titanium ion(Ti^4+)doping.Ti4+has small radius which is proved to form at the grain boundary of polycrystalline perovskite.By control doping of titanium ion,grain size become more uniform,which leads to more continuous perovskite thin film.Studies suggest that the defects in grain boundary of polycrystalline perovskite are passivated by doping Ti4+,which results in the trap states concentration greatly decrease.And experimental test clearly exhibits more excellent performance of short-circuit current density(JSC=22.3 mA·cm^-2),open-circuit voltage(VOC=1.10 V),fill factor(FF=72.4%)and photovoltaic conversion efficiency(PCE=17.4%)with low amount Ti4+doping compared with pure planar heterojunction perovskite solar cells(AM1.5).