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Multiple exciton generation in chiral carbon nanotubes: Density functional theory based computation

机译:手性碳纳米管中的多个激子生成:密度函数理论基于计算

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We use a Boltzmann transport equation (BE) to study time evolution of a photo-excited state in a nanoparticle including phonon-mediated exciton relaxation and the multiple exciton generation (MEG) processes, such as exciton-to-biexciton multiplication and biexciton-to-exciton recombination. BE collision integrals are computed using Kadanoff-Baym-Keldysh many-body perturbation theory based on density functional theory simulations, including exciton effects. We compute internal quantum efficiency (QE), which is the number of excitons generated from an absorbed photon in the course of the relaxation. We apply this approach to chiral single-wall carbon nanotubes (SWCNTs), such as (6,2) and (6,5). We predict efficient MEG in the (6,2) and (6,5) SWCNTs within the solar spectrum range starting at the 2E(g) energy threshold and with QE reaching similar to 1.6 at about 3E(g), where E-g is the electronic gap. Published by AIP Publishing.
机译:我们使用Boltzmann传输方程(BE)来研究纳米颗粒中的光激发态的时间演变,包括声子介导的激子弛豫和多个激子生成(MEG)过程,例如Exciton-to-Biexciton乘法和Biexciton-to - XCiton重组。 基于密度泛函理论模拟,使用Kadanoff-Baym-Keldysh多体扰动理论来计算碰撞积分,包括激子效果。 我们计算内部量子效率(QE),这是在松弛过程中由吸收的光子产生的激子的数量。 我们将这种方法应用于手性单壁碳纳米管(SWCNT),例如(6,2)和(6,5)。 我们在太阳谱范围内的(6,2)和(6,5)和(6,5)SWCNT中的高效MEG在2E(g)能量阈值开始,并且Qe在约3e(g)下类似于1.6的Qe,其中例如是 电子差距。 通过AIP发布发布。

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