SIMULATIONS OF OPTIMAL SOLAR CELL ARCHITECTURE AND MATERIAL PARAMETERS FOR SILICON HETEROJUNCTION CELLS ON QUASI-MONO SUBSTRATE: STRATEGIES FOR OBTAINING EFFICIENCIES OVER 20

摘要

In a race for a cost reduction, applicability of quasi-mono silicon wafers for fabrication of high-efficiency silicon heterojunction (SHJ) devices is inspected. We present numerical simulations of influence of the bulk lifetime (τ_(eff)) on solar cell output parameters, which are verified by cell results for both front emitter (FE) and rear emitter (RE) configurations. FE outperforms RE configuration in a range of lifetime from 200 μs to 1000 μs mainly due to the enhanced short-circuit current J_(sc), while at τ_(eff) = 1200 μs efficiencies are getting almost equal for both configurations. We conclude bulk lifetime of 1 ms as a requirement for fabrication of SHJ with efficiencies over 20% which is in good agreement with results of finished cells.