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arXiv 2004.05390cond-mat.mtrl-sci
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磷化硼作为\emph{p}型透明导体:通过电子-声子耦合的光吸收和传输

Boron phosphide as a \emph{p}-type transparent conductor: optical absorption and transport through electron-phonon coupling

Viet-Anh Ha, Bora Karasulu, Ryo Maezono, Guillaume Brunin, Joel Basile Varley, Gian-Marco Rignanese, Bartomeu Monserrat, Geoffroy Hautier

摘要:

磷化硼是一种具有高空穴迁移率的透明导电材料。这一承诺源于其低空穴有效质量。然而,BP具有相对小的2 eV间接带隙,这将影响其透明度。在这项工作中,我们计算研究了间接间隙的光吸收和声子限制的电子输运,以量化磷化硼作为\emph{p}型透明导体的潜力。我们发现,在可见光谱中,声子介导的间接光吸收很弱,并且在室温下,声子限制的空穴迁移率非常高(约900 cm $^2$ /Vs)。这种特殊的流动性来自低空穴有效质量和极声子模式的非常弱的散射的组合。我们合理化的弱散射的磷化硼相比,氧化物的离子键。我们认为这可能是\emph{p}型透明导电应用的非氧化物的一般优点。使用我们计算的属性,我们评估的透明导体的品质因数磷化硼,并表明,它超过了一个数量级,建立\emph{p}型透明导体,确认这种材料的潜力。

英文摘要:

Boron phosphide has recently been identified as a potential high hole mobility transparent conducting material. This promise arises from its low hole effective masses. However, BP has a relatively small 2 eV indirect band gap which will affect its transparency. In this work, we computationally study both optical absorption across the indirect gap and phonon-limited electronic transport to quantify the potential of boron phosphide as a \emph{p}-type transparent conductor. We find that phonon-mediated indirect optical absorption is weak in the visible spectrum and that the phonon-limited hole mobility is very high (around 900 cm$^2$/Vs) at room temperature. This exceptional mobility comes from a combination of low hole effective mass and very weak scattering by polar phonon modes. We rationalize the weak scattering by the less ionic bonding in boron phosphide compared to oxides. We suggest this could be a general advantage of non-oxides for \emph{p}-type transparent conducting applications. Using our computed properties, we assess the transparent conductor figure of merit of boron phosphide and shows that it exceeds by one order of magnitude that of established \emph{p}-type transparent conductors, confirming the potential of this material.

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