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arXiv 1607.07652cond-mat.mtrl-sci
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重卤素功能化石墨烯的强一维局域化和各向异性电子空穴质量

Strong 1D localization and highly anisotropic electron-hole masses in heavy-halogen functionalized graphenes

Lukas Eugen Marsoner Steinkasserer, Alessandra Zarantonello, Beate Paulus

摘要:

虽然石墨烯的卤化为构建化学和物理上多样化的系统提供了一条迷人的途径,但它们在光化学中的应用却受到了通常过大的光学间隙的阻碍。本文研究了部分溴化和氯化对石墨烯和含氟石墨烯的结构和光电性能的影响。我们发现溴化和氯化的氟石墨烯衍生物与石墨烯一样稳定,即使在高温下也很可能耐用。系统的能带结构的详细调查揭示了显着的一维本地化的载流子,以及强烈的电子-空穴不对称的有效质量。最后,使用$G_0W_0$和BSE,我们研究了上述材料的光学吸收光谱,其第一个吸收峰被示出为接近光伏应用的最佳峰位置($\approx 1.5$ eV)。

英文摘要:

While halogenation of graphene presents a fascinating avenue to the construction of a chemically and physically diverse class of systems, their application in photovoltaics has been hindered by often prohibitively large optical gaps. Herein we study the effects of partial bromination and chlorination on the structure and optoelectronic properties of both graphane and fluorographene. We find brominated and chlorinated fluorographene derivatives to be as stable as graphane making them likely to be durable even at elevated temperatures. A detailed investigation of the systems band structure reveals significant 1D localization of the charge carriers as well as strongly electron-hole asymmetric effective masses. Lastly using $G_0W_0$ and BSE, we investigate the optical adsorption spectra of the aforementioned materials whose first adsorption peak is shown to lie close to the optimal peak position for photovoltaic applications ($\approx 1.5$ eV).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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