A novel MoS2-based hybrid film as the back electrode for high-performance thin film solar cells

MoS2, a representative two-dimensional transition metal dichalcogenide, gains significant interest due to its unique layered structure and electronic structure. In this work, a novel MoS2-based hybrid thin film was constructed by disordered stacking of MoS2-NMP hybrid particles, which were mainly composed of MoS2(NMP)(3) molecules stacking in a nearly-parallel manner through S center dot center dot center dot H-C hydrogen bonds. Interestingly, it presents a higher work function (5.42 eV) than Au (5.32 eV), and a unique thicknessdependent conductivity with p-type semiconductor characteristic. Using it as the back contact of CdTe solar cells, the efficiency was improved by 2.6% compared to the traditional cells, mainly from the great improvement in short-circuit current density (J(sc)). This significant improvement in solar performance was ascribed to the matchable energy levels at the CdTe/MoS2-based thin film interface and its unique thickness-dependent conductivity. This work opens a new direction for the extensive applications of TMD-based materials.Guangdong Innovative and Entrepreneurial Research Team Program [2013N080]; Peacock Plan [KYPT20141016105435850]; KYPT20141016105435850 [(2012)780, ZDSY20130331145131323]; International Postdoctoral Exchange Fellowship Program [53 Document of OCPC]SCI(E)ARTICLE3823415-23421