Abstract
The bifacial passivated emitter and rear-side contact cells (PERCs) are capturing a growing photovoltaic market share, with a trend to replace monofacial device. Here, we reported five different rear pyramidal light trapping structures prepared by acid etching, with the monofacial counterparts as a comparison. The impact of the rear pyramid angles on the efficiency between under front and rear illumination shows an opposite trend due to a wavelength-dependent optical performance. To accurately optimize devices in real outdoor environments, the photovoltaic performance of mofacial and bifacial PERCs at different incident angles is simulated and integrated with an omnidirectional efficiency. Consequently, a significant improvement in bifaciality under omnidirectional incidence is obtained compared to vertical incidence, and a rough surface structure yields the maximum bifacial gain when the albedo is greater than 30 %. Furthermore, the power yield of monofacial and bifacial devices was predicted for every day in 2022.
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