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세라미스트 = Ceramist, v.22 no.1, 2019년, pp.36 - 55
장혜연 (충북대학교 신소재공학과) , 남재현 (충북대학교 신소재공학과) , 조병진 (충북대학교 신소재공학과)
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Atomically thin two-dimensional (2D) nanomaterials, including transition metal dichalcogenides (TMDs), graphene, boron nitride, and black phosphorus, have opened up new opportunities for the next generation optoelectronics owing to their unique properties such as high absorbance coefficient, high ca...
| 핵심어 | 질문 | 논문에서 추출한 답변 |
|---|---|---|
| 2D 광 흡수물질 중 하나인 그래핀이 가지고 있는 단점은 무엇인가? | 그래핀(graphene)은 가장 널리 알려진 2D 광 흡수물질 중의 하나이다. 하지만 에너지 밴드 갭이 없어 암전류(dark current)가 상당히 높으며 이는 광 소자의 검출 성능을 크게 저하시킨다. 최근 그래핀과 유사한 honeycomb 구조를 갖고 있으면서도 밴드 갭이 존재하는 전이금속 디칼코게나이드(TMD, Transition MetalDichalcogenides) 소재가 광 검출 소재로 주목받고 있다. | |
| TMD 물질로 무엇이 있는가? | 2D TMD는 MX2 (M: 전이금속, X: 칼코겐) 조성을 갖는 화합물로 층 수, 결정 구조, 원소 조성에 따라 다양한 전기적 또는 광학적 특성을 갖는다. 예를 들면, MoS2, MoSe2, WS2, WSe2, SnS2와 같은 TMD는 높은 캐리어 이동도(mobility)를 갖고 있으며 가시광선 스펙트럼 범위에서 효율적인 광 흡수 특성을 이용한 광전자 소자에 응용이 가능하다.1–4) TMD 소재와 비슷한 에너지 밴드 특성과 에너지 스펙트럼을 가지는 BP(Black Phosphorus)에 대한 광 특성 연구도 활발하게 진행되었다. | |
| 광 흡수물질 중 2D 소재로 헤테로 접합 소자 제작이 가능한 이유는 무엇인가? | 또한, 층 수에 따라 광전자 특성을 쉽게 제어할 수 있을 뿐만 아니라 투명하고유연하지만 기계적 특성이 우수하여 플렉서블 광전자 분야로도 유망하다. 밴드 갭(band gap)이 서로 다른 2D 소재를 활용하면 매우 좁은 영역의 파장의 빛을 선택적으로 검출하거나 또는 매우 넓은 영역의 빛 스펙트럼을 검출하는 것이 모두 구현 가능하며, 특히, 2D 소재의 표면에는 댕글링 본드(dangling bond)가 없고 수직방향으로 약한 반데르발스(van der Waals) 결합으로 이루어져 있기 때문에 격자 매칭에 제한없는 다양한 헤테로 접합(heterojunction) 소자를 제작하는 것이 가능하다. |
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