P-type silicon heterojunction (SHJ) solar cells with a-SiC∶H(n) emitters were studied by numerical computer simulation in this paper.The influence of interface states,conduction band offset,and front contact on the performance of a-SiC∶H(n)/c-Si(p) SHJ solar cells was investigated systematically.It is shown that the open circuit voltage (Voc) and fill factor (F F) are very sensitive to these parameters.In addition,by analyzing equilibrium energy band diagram and electric field distribution,the influence mechanisms that interface states,conduction band offset,and front contact impact on the carrier transport,interface recombination and cell performance were studied in detail.Finally,the optimum parameters for the a-SiC∶H(n)/c-Si(p) SHJ solar cells were provided.By employing these optimum parameters,the efficiency of SHJ solar cell based on p-type c-Si was significantly improved.