신소재공학부 김형섭 교수 연구팀, 삼성전자 종합기술원과 산화물로부터의 이차원 반도체 소재 형성 기구 최초 규명 > AMSE NEWS

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신소재공학부 김형섭 교수 연구팀, 삼성전자 종합기술원과 산화물로부터의 이차원 반도체 소재 형성 기구 최초 규명

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댓글 38건 조회 6,435회 작성일 21-04-19 14:57

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신소재공학부 김형섭 교수 연구팀,
삼성전자 종합기술원과 산화물로부터의 이차원 반도체 소재 형성 기구 최초 규명


editorImage.do?EwBmEYHoQFkh7AYgawKIDMBeiAuB5AEwDUAlAIQHEAJAdwBlUBVTAOgCsAHAcyA[그림1] 김형섭 교수 (성균관대, 공동교신), 이은하 전문연구원(삼성전자 종합기술원, 공동교신)


신소재공학부 김형섭(공동교신) 교수 연구팀이 삼성전자 종합기술원 이은하(공동교신) 전문연구원팀과 공동연구를 통해 산화몰리브덴(MoO2)으로부터 이차원 소재인 이황화몰리브덴(MoS2) 형성 시 일차원 형태의 매우 규칙적인 중간상 구조가 발현되는 것을 최초로 발견했다고 밝혔다.


최근 차세대 반도체 및 에너지 소자의 다양한 활용을 위해, 산화물의 황화 또는 셀렌화 기반 상변이 기구를 통해 수 나노미터 두께의 반데르발스 갭을 가지는 이차원 구조 소재로 합성하는 연구가 활발히 진행되고 있다. 이러한 상변이는 원자층 수준의 두께를 가지는 순차적인 층별 상변이 현상을 통해 이차원 구조로 발전한다.


연구팀은 산화몰리브덴을 이용한 이황화몰리브덴의 황화 공정 중 발생하는 층별 상변이 과정에서 매우 규칙적으로 배열된 일차원 구조형태의 중간상이 형성되는 것을 고분해능 투과전자현미경을 이용하여 처음으로 발견하였다. 제일원리 계산을 통해 이러한 중간상의 원자구조를 규명하였으며, 삼차원→일차원→이차원 구조로의 변이 과정을 원자수준에서 해석하였다.


editorImage.do?EwBmEYHoQFkh5ArgewBIDEBmBTACgKQDsBVAB0UwA0BbARQEMBRAFQDpTCBzIA

[그림2] (좌) 상변이 모식도, (우) 고분해능 투과전자현미경 사진


또한 연세대학교 물리학과 조만호 교수팀과의 협업을 통해, 이황화몰리브덴의 원자층 수에 따라 전기적 접촉특성을 p형과 n형으로 자유롭게 선택하여 조정할 수 있음을 엑스레이 광전자 분광법(X-ray photoelectron spectroscopy)으로 증명하였으며, 차세대 전자소자에 활용될 수 있을 것으로 전망했다.


공동 연구진은 “화학반응을 이용한 고체의 새로운 상변이 과정을 원자 수준의 직접적인 관찰을 통해 밝힌 것이 의미가 있으며, 향후 다양한 전자소자에 응용이 가능할 것으로 기대된다”고 말했다.


김형섭 교수 연구팀은 본 연구에 앞서 한국연구재단의 기초연구실사업(2014R1A4A1008474)의 지원을 받아 이황화몰리브덴의 합성 연구를 진행한 바 있으며, 그 후속연구로 삼성전자 종합기술원과 함께 이번 연구를 진행했다. 본 연구에는 삼성전자 종합기술원의 이향숙 전문연구원과 조연주 전문연구원이 공동 제1저자로 참여했으며, 연구결과는 재료 분야 세계적 권위 학술지인 Materials Today(Impact Factor=26.416, JCR ranking 상위 2.7%)'에 3.17(수) 온라인 게재되었다.
  ※ 논문명: 3D-to-2D phase transformation through highly ordered 1D crystals from transition-metal oxides to dichalcogenides
  ※ 논문 출처: https://www.sciencedirect.com/science/article/abs/pii/S1369702121000560

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I live and breathe poker, from Texas Hold'em to Omaha and beyond. This blog is my personal journal, dedicated to the most complex and rewarding card game on the planet. I deconstruct hand histories, discuss advanced strategy, and cover the psychological warfare of the poker table. Whether you're a novice or a seasoned shark, you'll find something to sharpen your skills. Let's conquer the game together.

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