▎ 摘　　要

Because graphene is hydrophilic in nature, it is very difficult to synthesize a stable well-dispersed graphene in ethanol without using dispersing agents. To improve the dispersion of graphene in ethanol, one possible strategy is to add different oxidizing agents to graphene. This leads to the formation of graphene dispersions in ethanol, and they have great stability. However, ultrasonication is required to bring about the synthesis of stable graphene dispersions in ethanol. In this paper, the surface-modified graphene was synthesized by two methods, which improved the dispersion of graphene in ethanol. In these methods, the modified graphene was incorporated into the carbon electrode in order to improve the conductivity of carbon electrode in perovskite solar cells. Thus, battery efficiency was improved significantly in solar cells by following this innovative strategy. We studied the conductivity effects of surface-modified graphene using different drying methods. Compared to the carbon electrode (without added graphene), the resistivity of grapheneincorporated carbon electrode significantly decreased from 1.130E-03 Omega.m to 8.429E-05 Omega.m when the carbon electrode was successfully subjected to carboxylation reaction; moreover, the resistivity of graphene-incorporated carbon electrode reduced to 1.163E-04 Omega.m when the electrode was successfully subjected to hydroxylation reaction. The value of R-Ct decreased sharply when we add modified graphene. The results indicate that when carbon electrode incorporated modified graphene, the resistivity became low and the electron transport properties of the electrode improved sharply. However, the efficiency of carboxylated graphene is much better than that of hydroxylated graphene.