One-step fabrication of ultrathin layered 1T@2H phase MoS2 with high catalytic activity based counter electrode for photovoltaic devices

摘要

The metallic phase of molybdenum disulfide(M-MoS2)and semiconductor phase of molybdenum disulfide(S-MoS2)was synthesized by hydrothermal method,using cetyltrimethylammonium bromide(CTAB)as a surfactant.The structural and elemental composition confirmed the formation of M-MoS2 and S-MoS2.From the morphological analysis layered nanosheets with an inter-layered distance of 0.62 nm for M-MoS2 and 0.95 nm for S-MoS2 was observed.Fourier-transform infrared(FT-IR)spectral analysis was used to investigate the existence of CTAB functional group.The peak at 885 cm-1 attributed to the CH3 bond which confirmed the presence of CTAB in the S-MoS2.The anodic and cathodic peak separation(Epp)values of the counter electrode(CE)has showed at 468.28 mV(M-MoS2)and 540.87 mV(S-MoS2).The M-MoS2 thin film shows higher catalytic activity when compared to S-MoS2 due to more active sites and electronic conductivity.The power conversion efficiency of M-MoS2 CE based device exhibits higher efficiency compared to S-MoS2 CE based device.