通过溶液中无机配体交换法合成p型PbS量子点墨水用于高效稳定太阳能电池

Traditional p-type colloidal quantum dot(CQD)hole transport layers(HTLs)used in CQD solar cells(CQDSCs)are com-monly based on organic ligands exchange and the layer-by-layer(LbL)technique.Nonetheless,the ligand detachment and com-plex fabrication process introduce surface defects,compromising device stability and efficiency.In this work,we propose a solu-tion-phase ligand exchange(SPLE)method utilizing inorganic ligands to develop stable p-type lead sulfide(PbS)CQD inks for the first time.Various amounts of tin(II)iodide(SnI2)were mixed with lead halide(PbX2;X=I,Br)in the ligand solution.By pre-cisely controlling the SnI₂ concentration,we regulate the transition of PbS QDs from n-type to p-type.PbS CQDSCs were fabri-cated using two different HTL approaches:one with 1,2-ethanedithiol(EDT)-passivated QDs via the LbL method(control)and another with inorganic ligand-passivated QD ink(target).The target devices achieved a higher power conversion efficiency(PCE)of 10.93%,compared to 9.83%for the control devices.This improvement is attributed to reduced interfacial defects and enhanced carrier mobility.The proposed technique offers an efficient pathway for producing stable p-type PbS CQD inks using inorganic ligands,paving the way for high-performance and flexible CQD-based optoelectronic devices.