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1091-專題演講-1091111-連德軒(交大電子)

演講活動
張貼人:李明芳公告日期:2020-08-18
  
Time1091111 (Wed.) 14:20~16:20
SpeakerProf.連德軒(LIEN, Der-Hsien (Danny))
國立交通大學電子工程學系暨電子研究所/Department of Electronics Engineering& Institute of Electronics, National Chiao Tung University
TitleOptoelectronic properties of the 2D excitonic system
AbstractAs semiconductors’ thickness approaches the monolayer limit, excitonic quasiparticles could be observed at room temperature due to the strong Coulomb interaction between space-confined charge carriers. 2D layered semiconductors in monolayer form (e.g., transition metal dichalcogenide monolayers) provide an ideal platform to investigate the transport properties of excitons and their complexes because surface issues in 2D monolayers are not as severe as in bulk semiconductors. I will show that such thickness-determined excitonic systems are promising for optoelectronic applications due to their near-unity photoluminescence (PL) quantum yields (QYs), a key figure of merit dictating the maximum efficiency achievable in light-emitting diodes, lasers, and solar cells. I will discuss the comprehensive recombination mechanisms of excitons in monolayers and showed that the non-radiative recombination pathways can be fully suppressed by electrostatic gating, despite the presence of native defects. This research reveals that room-temperature excitons are robust and bright regardless of monolayer quality, indicating the potential of achieving highly efficient excitonic devices. To deal with the injection inefficiency caused by Schottky contacts, I will show an AC carrier injection architecture, a device concept that is capable of efficiently injecting carriers in various excitonic systems, including monolayer semiconductors, with demonstrations of bright light-emitting devices from infrared to ultraviolet regimes
PlaceB101, Gongquan Campuses, NTNU

最後修改時間:2020-11-06 PM 2:38

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單位簡介

本系的重點研究領域包括:凝態物理、光電與奈米科學、高能與粒子物理、軟凝態物理與生物物理、原分子光學物理、及物理科學教育等。本系前身為臺灣省立師範學院理化系物理組,成立於民國三十五年(1946年)本校創校之始。民國五十一年(1962年)本系獨立成系,民國六十三年(1974年)成立物理研究所碩士班,民國八十年(1991年)成立研究所博士班。長久以來,本系肩負著培育臺灣中等學校物理科師資的重任,但也不忘在物理學術研究上求新求進步。至今本系培育出的學術人才已有一位中研院院士及近百位中研院研究員及大學教授,各行各業的高科技人材更是不勝枚舉。民國八十三年師資培育法改制後,本系已升級為尖端學術研究、科技應用研發、及中學師資培育三者齊備的系所。

  • 國立臺灣師範大學物理系系友會
  • 系友會線上小額捐款
  • 徐有庠盃-臺灣青年學生物理辯論競賽
  • 國際物理奧林匹亞競賽
  • 公用場地與儀器設施預約系統
  • 學生實習專區
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