Abstract
Herein, a zero-dimensional graphene quantum dots (GQD) anchored on reduced graphene oxide (rGO) sheets were synthesized by hydrothermal method. CuS and GQD anchored rGO sheet (GRGS/CuS) composite was prepared by simple spin coating and thermal sulfidation techniques and used as counter electrode (CE) material for CdS quantum dot sensitized solar cell (QDSSC). The morphological studies of GRGS/CuS composite revealed the presence of spherical graphene quantum dots and microflower structured CuS on rGO sheet matrix. This microflower morphology provided more reactive sites for the electrolyte reduction and GQD/rGO in the composite acted as an effective conducting matrix to transport the charge carriers. The synergistic effect of GQD/rGO and CuS in the composite resulted in reduced charge transfer resistance and multi fold times increased the power conversion efficiency of GRGS/CuS composite than the bare counter electrodes. This work has opened up new opportunities to use GRGS/CuS composite material as a promising counter electrode, since it has the potential to enhance the performance of solar cells.
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