Performance Study Of Perovskite Solar Cells With PVK As Hole Transport Layer

In the past decades,organic-metal halide perovskite solar cells(PSC)have attracted tremendous attention due to their excellent performance.Remarkably,the PCE of PSC has rapidly increased from3.8% in 2009 to over 25.7%.Carrier transmission between the hole transport layers(HTLs)and the perovskite light-absorption material is one of the keys to ensure efficient solar cell operation.Therefore,in addition to using component design and morphology optimization of chalcogenide semiconductors to improve device efficiency and stability,the study of charge transport materials can also have a significant impact on device performance.Based on this,this thesis uses polymeric ptype materials as cavity transport media to achieve the dual advantage of reducing the cost of the battery and improving its resistance to degradation.The details of the study are as follows:(1)The conjugated polymers poly(9-vinylcarbazole)(PVK)was used as a hole transport material for the fabrication of the trans-perovskite solar cells solar cells.Firstly,the film formation conditions of PVK were optimized based on the PVK solvent concentration and preparation process.In addition,considering that the perovskite precursor solution may cause damage to PVK films,explored different storage environments as well as PVK covalent cross-linking strategies and investigated their effects on PSC device performance.(2)(N,N’-Di-[(1-naphthalenyl)-N,N’-diphenyl]-1,1’-biphenyl)-4,4’-diamine)(NPB)is introduced into PVK as the HTL of PSC to improve the interfacial contact between HTL and perovskite and the matching of the highest occupied molecular orbital(HOMO).Improve the interface contact between HTL and perovskite and the matching of maximum occupation of molecular track(HOMO).The experimental results show that the surface of NPB-doped PVK HTL films is smoother and more hydrophilic,which is favorable to the film formation of chalcogenide.High-quality perovskite films with larger grain size and smaller defect density were achieved,thus improving the performance of PSC.(3)The solvent of PVK: NPB HTL was optimized to simultaneously improve the quality of perovskite layer and the energy level matching between the HOMO of HTL and the perovskite layer.The addition of CB as a solvent for HTL in DMF improved the film quality of HTL and obtained perovskite films with larger grain size and lower defect density,while further regulating the valence band energy level alignment between HTL and perovskite films.This work was carried out to provide a theoretical basis for the realization of efficient PSCs based on PVK-HTL.