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106-2專題演講-1070425

演講活動
張貼人:李明芳公告日期:2018-02-12
  
Time2018/4/25 (Wed.) 14:20~16:20
SpeakerProf.謝馬利歐(Mario Hofmann)
國立台灣大學物理學系/Department of Physics, National Taiwan University
TitleFabrication and optoelectronic application of graphene heterojunctions
AbstractGraphene is a single-atom thin carbon material that has captured the attention of researchers in fundamental and applied sciences for the last decade. Graphene’s unique properties, such as strong light-matter interaction and high carrier mobility, show great promise for optoelectronic devices. However, the absence of a bandgap and fast carrier relaxation make light emission and conversion in graphene very challenging. We here demonstrate the potential of graphene heterojunctions for such applications. First, challenges in the synthesis of graphene will be described and we will introduce our latest advances in optimizing the graphene quality through novel synthesis and transfer processes. We will then show the tunability of graphene’s carrier concentration by doping and the impact this process has on carrier transport. The demonstrated ability to control graphene’s fundamental properties makes it ideally suited for the integration in heterojunctions and we will present several examples of graphene enabled optoelectronic heterojunction devices.
First, we produce graphene-based ultrathin solid-state dye-sensitized solar cells with thicknesses between 5 nm and 100 nm, which represents some of the thinnest solar cells produced to date and allows us to extract the scaling limits of solar cells.
Furthermore, light emission in graphene/dielectric/p-GaN heterojunctions is discussed. Efficient and stable light emission was achieved through carrier tunneling from the graphene injector into prominent states of a luminescent material. Graphene’s unique properties enable fine control of the band alignment in the heterojunction and vertical tunneling-injection light-emitting transistors (VtiLET) were produced where electrostatic gating allows adjustment of the light emission process. This advance enables arbitrary color light emission from one single emitter.
PlaceRoom S101, Gongquan Campuses, NTNU
最後修改時間:2018-03-07 PM 2:49

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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
  • BOSON CLUB
  • 公用場地與儀器設施預約系統
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