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Effective Carrier Collection in Bifacial Silicon Heterojunction Solar Cells by Band-Offset Reduction
Duy Phong Pham(강사),Hyeong Gi Park(박형기),Youngkuk Kim(김영국),Junsin Yi(이준신) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
Bifacial silicon heterojunction (SHJ) solar cells have been attracted due to potential high performance. Because of bifacial illumination, wide-gap hydrogenated nano-crystalline silicon oxide (nc-SiOx:H) materials should be used as front and back surface filed to enhancing significantly the light into the absorber. In this work, we reduced the band-offset at the p/i interface of bifacial SHJ cells using buffer layers. With ultra-thin hydrogenated amorphous silicon oxide (a-SiOx:H) buffer layer, the band-offset at the p/i interface was significantly decreased resulting in effective hole carrier collection. A considerable enhancement in the open-circuit voltage (Voc) and fill factor (FF) was obtained. These were confirmed by experiment and simulation results. An experiment high efficiency of 23% at one side illumination with Voc of 729 mV, FF of 80% and short-circuit current density of 39.5 mA/cm<sup>2</sup> was obtained.