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세라미스트 = Ceramist, v.23 no.2, 2020년, pp.145 - 165
박소정 (서울대학교 재료공학부) , 지수근 (서울대학교 재료공학부) , 김진영 (서울대학교 재료공학부)
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Halide perovskites are promising photovoltaic materials due to their excellent optoelectronic properties like high absorption coefficient, low exciton binding energy and long diffusion length, and single-junction solar cells consisting of them have shown a high certified efficiency of 25.2%. Despite...
| 핵심어 | 질문 | 논문에서 추출한 답변 |
|---|---|---|
| 할라이드페로브스카이트의 구조는 무엇인가 | 2 % 의 공인 인증 광전변환 효율(PCE)을 기록하고 있다1). 할라이드페로브스카이트는 ABX3의 화학식을 가지며, BX6 팔면체가 A로 이루어진 육면체의 꼭짓점을 공유하는 3차원 결정구조를 이루고 있다. 일반적으로 A-site는 메틸암모늄(Methylammonium+), 포름아마디늄(Formamidinium+), Cs(Cesium+)과 같은 유기 및 무기 양이온으로 이루어져 있으며, 단일 조성 또는 위의 양이온 들을 적절한 비율로 혼합하여 사용한다. | |
| 할라이드 페로브스카이트(perovskite)의 특성은 무엇인가 | 할라이드 페로브스카이트(perovskite)는 높은 광흡수 계수(absorption coefficient), 낮은 엑시톤(exciton) 결합 에너지, 긴 전하확산거리(diffusion length)와 같은 우수한 광전기적 특성을 가진다. 이처럼 우수한 물질 특성을 기반으로 페로브스카이트 태양전지에 대한 연구가 활발히 이루어지고 있고, 현재 페로브스카이트 단일 광흡수층 태양전지는 25. | |
| 페로브스카이트의 A-site는 어떻게 이루어져 있는가 | 할라이드페로브스카이트는 ABX3의 화학식을 가지며, BX6 팔면체가 A로 이루어진 육면체의 꼭짓점을 공유하는 3차원 결정구조를 이루고 있다. 일반적으로 A-site는 메틸암모늄(Methylammonium+), 포름아마디늄(Formamidinium+), Cs(Cesium+)과 같은 유기 및 무기 양이온으로 이루어져 있으며, 단일 조성 또는 위의 양이온 들을 적절한 비율로 혼합하여 사용한다. 그리고 B-site는 금속 양이온 자리로 납(Pb2+), 주석(Sn2+) 이사용 되고, X-site는 아이오딘(I-), 브로민(Br-), 염소(Cl-)와 같은 할로겐 음이온이 위치하고 있다. |
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