Optoelectronic properties of methyl-terminated germanane
Optoelectronic properties of methyl-terminated germanane
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DOI：
10.1063/1.5111011
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发表时间：
2019-07-29
影响因子：
4
通讯作者：
Lhuillier, Emmanuel
中科院分区：
文献类型：
--
作者：
Livache, Clement;Ryan, Bradley J.;Lhuillier, Emmanuel
锗烷是锗的一种二维、强约束形式。它呈现了一个有趣的组合：(i)易于与CMOS技术集成，（ii）低毒性，以及（iii）电子约束，将大块材料的间接带隙转变为具有光致发光特性的直接带隙。然而，对这种材料的光电特性的研究远远少于其结构特性。本文研究了端甲基日耳曼烷薄片阵列的光致发光和输运性质。光致发光似乎有两个贡献，一个来自带边缘，另一个来自陷阱态。激子的动力学范围在1-100ns之间。该材料的导电表现为p型，而光导时间响应可短至100 μ s。
Germanane is a two-dimensional, strongly confined form of germanium. It presents an interesting combination of (i) ease of integration with CMOS technology, (ii) low toxicity, and (iii) electronic confinement which transforms the indirect bandgap of the bulk material into a direct bandgap featuring photoluminescence. However, the optoelectronic properties of this material remain far less investigated than its structural properties. Here, we investigate the photoluminescence and transport properties of arrays of methyl-terminated germanane flakes. The photoluminescence appears to have two contributions, one from the band edge and the other from trap states. The dynamics of the exciton appear to be in the range of 1-100ns. Conduction in this material appears to be p-type, while the photoconduction time response can be made as short as 100 mu s.