Bulletin of the Korea Photovoltaic Society (한국태양광발전학회지)

Korea Photovoltaic Society (한국태양광발전학회)
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안티모니 셀레나이드 태양전지의 연구 개발 동향: 에너지 밴드 정렬 최적화

  • 신병하 (한국과학기술원 신소재공학과) ;
  • 지승환 (한국과학기술원 신소재공학과) ;
  • Published : 2023.10.31
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Abstract

지구상에 풍부하며 저독성 소재인 안티모니 셀레나이드(Sb2Se3)는 재료가 갖는 우수한 광전자적 특성과 장기 내구성으로 차세대 태양전지 소자로 크게 주목 받고 있다. 또한, 비교적 짧은 연구기간 동안 빠른 성장 속도를 보여줬으며, 2014년 2.26%에서 8년의 연구기간 동안 약 5배인 2022년 10.57%를 달성하였다. 하지만, 여전히 기존의 칼코지나이드계 박막 태양전지인 CdTe(22.1%) 및 Cu(In,Ga)Se2(23.35%)가 달성한 효율에 비해 낮은 변환 효율을 보이고 있으며, 이는 계면에서 발생하는 캐리어 재결합으로 인한 개방전압 손실 문제가 주 원인으로 대두되고 있다. 따라서, Sb2Se3 광 흡수층에 인접한 전자 및 정공 수송층 사이에 적절한 밴드 정렬을 구축하여 캐리어 재결합 손실을 줄이는 것이 고효율 Sb2Se3 태양전지를 구현하기 위한 핵심 전략 중 하나이다. 본 원고에서는 Sb2Se3 광 흡수층의 기본적인 특성과 Sb2Se3 태양전지의 최근 연구 성과에 대해 간략하게 설명하고자 하며, 특히 전자 및 정공 수송층 적용을 통한 에너지 밴드 정렬 최적화에 관련된 내용을 중점적으로 소개하고자 한다. 또한, Sb2Se3 박막 태양전지 성능의 병목 현상을 극복하기 위한 잠재적인 연구 방향에 대해서도 논하고자 한다.

Keywords

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