▎ 摘　　要

Present investigation establishes simple 2D tunnelling nanostructure created by an assembly of ferromagnetic g-C4N3 electrodes separated by insulating graphene sheet; as a potential spincaloritronic device. The system shows large departure in up and down spin component of Seebeck coefficient and spin thermoelectric figure of merit is 10(3) times larger than charge part. Emergence of spin polarized Seebeck coefficient may be attributed to intrinsic ferromagnetism of g-C4N3 and spin-injection from ferromagnetic electrode to insulating graphene. This widely varying spin polarized Seebeck coefficient is attributed to large negative slope of logarithmic transmission coefficient of spin up channel compared to spin down counterpart.