多功能乳清酸钝化协助制备高效稳定的钙钛矿太阳能电池

Multifunctional Orotic Acid Passivation for Efficient and Stable Perovskite Solar Cells

空气环境中制备钙钛矿太阳能电池(PSCs)对于发展更高性价比的光伏器件具有重要意义。然而,空气环境制备的钙钛矿层存在大量的阴阳离子缺陷,严重影响器件性能。因此,采用乳清酸(OA)作为添加剂,通过添加剂工程对混合阳离子钙钛矿薄膜缺陷进行有效调控。OA中的羧基能与钙钛矿中未配位的Pb2+键合,吡啶环上的含氮基团与未配位的I-形成氢键,在降低钙钛矿薄膜缺陷态密度的同时增大钙钛矿晶粒尺寸,抑制载流子的非辐射复合。经OA钝化PSCs的光电转换效率(PCE)从19.89%提升到22.09%,在空气环境中放置1000 h还可保持93.85%的初始效率。

It is great significance for the preparation of perovskite solar cells(PSCs)in the ambient air for its commercialization process.However,there are a lot of anion and cation defects appeared in perovskite film during the air environment prepare procedure,which seriously affects the device performance.Hence,orotic acid(OA)was used as additive to regulate the defects in mixed cation perovskite layer through additive engineering.The carboxyl group in OA can bond with the uncoordinated Pb2+in the perovskite,and the nitrogen-containing group on the pyridine ring forms a hydrogen bond with the uncoordinated I−,which can reduce the defect density and increase the grain size of the perovskite film,and inhibiting the non-radiative recombination of carriers.The photoelectric conversion efficiency(PCE)of PSCs passivated by OA increased from 19.89%to 22.09%,and which can keep 93.85%the initial PCE after 1000 hours in the ambient air.