Performance Research Of Perovskite Solar Cell Based On Solvent-free Silver Nanowire Top Electrode

The transparent top electrode is one of the key components of semitransparent solar cells.The silver nanowires(Ag NWs)network prepared by the solution process has the advantages of excellent transparency,conductivity,mechanical flexibility,and the electrode preparation cost is generally lower than that of the electrodes deposited by vacuum thermal evaporation and sputtering methods.The general concern.When preparing solution-based Ag NWs electrodes by printing,the extremely low concentration of Ag NWs dispersion system and the sensitivity of perovskite films to solvents make it a great challenge to prepare Ag NWs top electrodes using solution methods on perovskite solar cell devices.However,there are few reports in the literature on translucent perovskite batteries with dispersant-free Ag NWs top electrodes.In order to avoid the influence of the solvent in Ag NWs on the device preparation process,it is better to study the interfacial layer between Ag NWs and perovskite batteries.The influence of this is conducive to large-area printing and production of solar cells.Therefore,the complete dry transfer method of spraying Ag NWs electrodes on different substrates is studied,and ITO/PEDOT: PSS/PVSK/PCBM/PEI/Ag NWs is used as the device structure of the perovskite battery,which specifically includes the following two aspects Systematic research content:(1)Using rigid quartz glass as the substrate research object,study the performance changes of solar cell after spraying Ag NWs dry transfer.First,the Ag NWs electrode was sprayed on clean quartz glass,and the OTS self-assembly layer was hydrophobized to solve the damage of the perovskite solar cell thin film layer,and then the OTS surface was hydrophobized.The spraying of Ag NWs was optimized,and finally,the top electrode of Ag NWs was successfully laminated with polyethyleneimine(PEI),which realized 100%solvent-free transfer of Ag NWs electrode,and successfully prepared the perovskite solar cell device.The choice of PEI as the interface layer has three-in-one advantages,including the adhesion of the top electrode,surface modification to achieve air-stabilized low work function,and suppression of chemical corrosion of metal electrodes in perovskite-type solar cells.The lamination operation is completed at a pressure of 8 MPa under very mild room temperature conditions.The optimal power conversion efficiency of the optimized solar cell with laminated transparent top electrode is 12.73%,which is about 83.5% of the highest PCE obtained from the device with opaque Al electrode.It is found that the average value of the PEI thickness between the Ag NWs and the adjacent PC61 BM layer plays a key role in adjusting the performance of the solar cell.The mechanism of PEI movement under pressure under the action of external pressure has been studied.(2)Using flexible polyethylene terephthalate(PET)as the substrate research object,study the performance changes of solar cell after spraying Ag NWs dry transfer.First,by increasing the amount of Ag NWs sprayed,ethanol immersion cleaning and annealing of the PEI layer and other optimization measures,the defects of the device during the transfer were eliminated,and the device was successfully fabricated with an efficiency of 11.31%.However,although the method of cleaning and pressurization reduces the contact resistance of Ag NWs,it increases the internal contact of Ag NWs itself.In addition,PET itself has better contact with Ag NWs,so there is still a lot of Ag NWs remaining on PET.In order to reduce the contact force between the Ag NWs and the PET surface,the perhydropolysilazane(PHPS)solution method and the inductively coupled enhanced plasma deposition system(ICP-PECVD)deposition method were used to prepare a layer of Si O2 on the surface of the PET.The complete transfer of Ag NWs is achieved,and the device efficiency is increased to 12.63%,which is equivalent to the device efficiency of the rigid substrate Ag NWs transfer.Finally,through-hole top electrodes of Ag NWs were fabricated on the PET substrate by a UV laser etching machine and a screen printer,and the diameter of the through-hole and the UV laser processing technology were optimized.The perovskite solar cell device was successfully prepared.The performance of the device is intact,but the efficiency needs to be improved.