▎ 摘　　要

NOVELTY - A graphene-polycrystalline silicon composite is an aggregate of several unit crystals formed using polycrystalline silicon, and has a structure in which graphene is arranged at grain boundaries between unit crystals. USE - Graphene-polycrystalline silicon composite is used for forming conductor and substrate (all claimed) for solar cell. ADVANTAGE - The graphene-polycrystalline silicon composite has excellent charge-transfer property and interface-controlling effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for production of graphene-polycrystalline silicon composite, which involves mixing a silicon powder and an oxidized graphene powder in a dispersion solvent, adding a reducing agent to the mixture of silicon powder and oxidized graphene powder for preparing a mixed powder, and sintering the mixed powder. A reduced graphene oxide is coated on the surface of the silicon powder.