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We employ simulation based approach for enhancing the efficiency of Cu2ZnSnS4(CZTS) based solar cells. Initial benchmarking of simulation with theexperimentally reported solar cell in literature is performed by incorporatinga suitable defect model. We then explore the effects of: (a) conduction bandoffset (CBO) at CZTS/CdS junction, (b) back surface field (BSF) due to anadditional layer with higher carrier density, and (c) high work function backcontact. Efficiency is observed to improve by about 70% upon optimizing theabove three parameters. We also observe that utilizing BSF in the configurationcan reduce the high work function requirement of the back contact. A workfunction of 5.2 eV (e.g., using Ni), a BSF layer (e.g., using SnS), and a CBOof 0.1 eV (e.g., using ZnS) constitute an optimal configuration.

Role of contact work function, back surface field and conduction band offset in CZTS solar cell