Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Efficient surface treatment based on an ionic imidazolium hexafluorophosphate for improving the efficiency and stability of perovskite solar cells
Surface defects have been a primary limitation for perovskite solar cells (PSCs). Herein, the introduction of 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) into the perovskite surface with the help of isopropanol (IPA) solvent can passivate the surface defects. The surface reconstruction of perovskite caused by IPA makes it easier for [BMIM]+ to passivate uncoordinated Pb2+ defects, [PF]6? to more easily replace and compensate unstable I?/Br? ions and I?/Br? vacancies. This forms large perovskite grains and island-like Cs0.05(MA0.12FA0.88)0.95Pb(I0.88Br0.12)3-x(PF6)x interlayers, which significantly reduces the defect-states density and inhibits recombination, and the energy barrier for the perovskite and the hole transport layer is also lowered. As a result, the open-circuit voltage was elevated from 1.112 to 1.181 V, and the efficiency for solar cells was also increased from 19.01% to 21.51%. In addition, the surface treatment of the hydrophobic BMIMPF6 can isolate the erosion of moisture and obtain better stability.
» Author: Weichun Pan, Jianming Lin, Jihuai Wu, Xiaobing Wang, Guodong Li, Yitian Du, Wenjing Li, Weihai Sun, Zhang Lan
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
