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NTIS 바로가기태양광발전학회 = Bulletin of the Korea Photovoltaic Society, v.3 no.2, 2017년, pp.27 - 41
최재영 (동아대학교 신소재공학과) , 김인호 (한국과학기술연구원 전자재료연구단)
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핵심어 | 질문 | 논문에서 추출한 답변 |
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실리콘 태양전지에서 웨이퍼의 두께가 얇아지게 될 경우 장점은 무엇인가? | 현재 상용 태양전지의 두께는 160~200 µm이나, 웨이퍼링의 기술 발전을 통해 그 두께가 지속적으로 낮아질 것으로 전망된다. 웨이퍼의 두께가 얇아지게 될 경우, 실리콘 재료 사용량 저감으로 인한 원가 절감 효과 이외에 광여기 된 전하가 전극까지 이동해야 하는 경로가 짧아지게 되어 재결합 손실이 줄어들게 되며, 이에 따라 광전압이 향상될 수 있는 장점이 생긴다. 이렇게 두께가 얇은 초박형 웨이퍼(< 50 um)는 경량화 및 기계적 유연성이 현재 상용화된 태양전지에 비해 우수하여, 곡면의 구조물에도 응용이 가능하여 건물외벽, 전기 자동차, 무인 비행기와 같은 새로운 분야에도 적용이 가능할 것으로 기대가 된다(그림 1). | |
결정질 실리콘의 반사율을 낮추기 위해 무엇을 적용하는가? | 5)은 공기에 비해 상대적으로 높아 가시광선 및 근적외선 대역에서 반사율이 30% 이상으로 매우 높다. 이를 낮추기 위해 보통 단일 박막 또는 다층박막을 이용하여 무반사 코팅을 적용한다. 실리콘 웨이퍼 후면에 이상적인 반사판(R=100%)을 배치하였다고 가정하자. | |
현재 상용 태양전지의 두께는 몇 µm인가? | 따라서 발전단가를 높이기 위해, 고효율화와 함께 실리콘의 재료 사용량을 낮추려는 노력이 함께 진행되고 있다. 현재 상용 태양전지의 두께는 160~200 µm이나, 웨이퍼링의 기술 발전을 통해 그 두께가 지속적으로 낮아질 것으로 전망된다. 웨이퍼의 두께가 얇아지게 될 경우, 실리콘 재료 사용량 저감으로 인한 원가 절감 효과 이외에 광여기 된 전하가 전극까지 이동해야 하는 경로가 짧아지게 되어 재결합 손실이 줄어들게 되며, 이에 따라 광전압이 향상될 수 있는 장점이 생긴다. |
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