Research Of Perovskite Solar Cell Modified By GO/PEG Interface

As a new type of solar cells,perovskite solar cell has attracted attention.During just seven years,its efficiency quickly broke through 20%.For perovskite solar cells,reducing the cost of the device,improving the energy conve rsion efficiency and the stability of the device can be the key to its future commercial application.So it is the hot topic to look for cheap and stable materials in pe rovskite solar cell components in the present study of perovskite solar cell.Graphene oxide,a hole-transporting material,has been widely applied in organic solar cells to replace PODOT: PSS.But there are few studies on its application in perovskite solar cells.This article concentrated on using graphene oxide and alcohol soluble polymer PEG composite to replace PEDOT: PSS.The main contents in this work are as follows:Graphene oxide was prepared with the improved Hummers,characterized by SEM,XRD.The graphene oxide film was obtained by spin coating.The influence of the graphene oxide on the perovskite solar cells film was studied.The result showed that the graphene oxide film has no effect on optical transmission properties.Compared to the bare ITO,the quality and crystallization of perovskite film on the ITO modified by graphene oxide were better.Comparing the different concentration of graphene oxide film,it was found that when the graphene oxide solution was 15 mg/ml,the solar cell efficiency was the highest 7.96%.The GO/PEG composite materials was made by blending the graphe ne oxide and PEG.The influence of GO/PEG on the perovskite solar cells film was studied.Analyzing the optical transmission of PEG and GO/PEG film,we found that the light transmission of glass with PEG and GO/PEG decreased about 5% in the visible light region.On the PEG or GO/PEG film,perovskite film had smooth surface and uniform grain sizes.After exposed in air,perovskite film decomposed more slowly than on graphene oxide film.GO/PEG as the hole transport layer,the photoelectric conversion efficie ncy of the device was significantly higher than that with the single material.When the concentration of GO in the composite was less than 15 mg/ml,the efficiency of the device increased with the increase of the concentration.Due to the agglomeration and stacking of GO,when the concentration increased to 20 mg/ml,both the open-circuit voltage and the short-circuit current were reduced,resulting in a decrease in efficiency.When the concentration of PEG in the composite was less than 0.75 mg/ml,the efficiency of the device increased with the increase of the concentration.Due to the increase of the thickness of the hole layer,when the concentration increased from 0.75 to 1.25 mg/ml,the short-circuit current decreased,which made efficiency decrease.When 15 mg/ml GO combined with 0.75 mg/ml PEG serves as the hole transport laye,the highest photoelectric conversion efficiency of 9.43% can be obtained.