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Experimental Observation of Strong Exciton Effects in Graphene Nanoribbons.
Nano Letters ( IF 9.6 ) Pub Date : 2020-03-31 , DOI: 10.1021/acs.nanolett.9b04816 Alexander Tries 1, 2 , Silvio Osella 3 , Pengfei Zhang 4 , Fugui Xu 4 , Charusheela Ramanan 1 , Mathias Kläui 2 , Yiyong Mai 4 , David Beljonne 5 , Hai I Wang 1
Nano Letters ( IF 9.6 ) Pub Date : 2020-03-31 , DOI: 10.1021/acs.nanolett.9b04816 Alexander Tries 1, 2 , Silvio Osella 3 , Pengfei Zhang 4 , Fugui Xu 4 , Charusheela Ramanan 1 , Mathias Kläui 2 , Yiyong Mai 4 , David Beljonne 5 , Hai I Wang 1
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Graphene nanoribbons (GNRs) with atomically precise width and edge structures are a promising class of nanomaterials for optoelectronics, thanks to their semiconducting nature and high mobility of charge carriers. Understanding the fundamental static optical properties and ultrafast dynamics of charge carrier generation in GNRs is essential for optoelectronic applications. Combining THz spectroscopy and theoretical calculations, we report a strong exciton effect with binding energy up to ∼700 meV in liquid-phase-dispersed GNRs with a width of 1.7 nm and an optical band gap of ∼1.6 eV, illustrating the intrinsically strong Coulomb interactions between photogenerated electrons and holes. By tracking the exciton dynamics, we reveal an ultrafast formation of excitons in GNRs with a long lifetime over 100 ps. Our results not only reveal fundamental aspects of excitons in GNRs (strong binding energy and ultrafast exciton formation etc.) but also highlight promising properties of GNRs for optoelectronic devices.
中文翻译：
石墨烯纳米带强激子效应的实验观察。
具有原子精确的宽度和边缘结构的石墨烯纳米带（GNR）由于其半导体性质和电荷载流子的高迁移率而成为光电子领域的一类有前景的纳米材料。了解GNR中基本的静态光学性质和电荷载流子产生的超快动力学对于光电应用至关重要。结合THz光谱和理论计算，我们报告了在宽1.7 nm，光学带隙为〜1.6 eV的液相分散GNR中，结合能高达〜700 meV的强激子效应，这说明了固有的强库仑相互作用在光生电子和空穴之间。通过跟踪激子动力学，我们揭示了GNR中激子的超快形成，其寿命超过100 ps。
更新日期：2020-03-24
中文翻译：
石墨烯纳米带强激子效应的实验观察。
具有原子精确的宽度和边缘结构的石墨烯纳米带（GNR）由于其半导体性质和电荷载流子的高迁移率而成为光电子领域的一类有前景的纳米材料。了解GNR中基本的静态光学性质和电荷载流子产生的超快动力学对于光电应用至关重要。结合THz光谱和理论计算，我们报告了在宽1.7 nm，光学带隙为〜1.6 eV的液相分散GNR中，结合能高达〜700 meV的强激子效应，这说明了固有的强库仑相互作用在光生电子和空穴之间。通过跟踪激子动力学，我们揭示了GNR中激子的超快形成，其寿命超过100 ps。
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