插层半导体的长期结构演变,Advanced Functional Materials

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插层半导体的长期结构演变
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-03-01 , DOI: 10.1002/adfm.201605038
Annabel R. Chew ₁ , Jose J. Fonseca _{2,

3} , Oscar D. Dubon _{2,

3} , Alberto Salleo ₁

Affiliation

插入的分子可以显着改变层状半导体的电子能带结构，从而显着改变材料的光学性能。在层状单硫属化物碲化镓（GaTe）中，由于层间扩散和氧的化学吸附，暴露于空气中会导致其带隙降低近1 eV。然而，在Te端表面上的化学吸附对GaTe结构的影响尚不为人所知。为了更好地了解嵌入的GaTe的结构与性质之间的关系，已对暴露于环境条件下的GaTe脱落晶体进行了系统的，长期的X射线衍射研究。可以观察到，结构变化不仅限于先前观察到的晶格膨胀的短期增加。在剥落后的几个月甚至几年的过程中，氧吸附物继续修饰GaTe的结构，导致明显的紊乱和晶粒重新定向。据估计，插入的氧气使每两个晶粒中的约一个略微移位，这表明晶粒镶嵌性显着增加，同时仍保持原始的{−2 0 1}面外纹理。将这些结构转变与观察到的电学和光学性质的变化相关联，将能够使使用吸附剂的资本化，从而在这些层状材料中工程化新的性质。据估计，插入的氧气使每两个晶粒中的约一个略微移位，这表明晶粒镶嵌性显着增加，同时仍保持原始的{−2 0 1}面外纹理。将这些结构转变与观察到的电学和光学性质的变化相关联，将能够使使用吸附剂的资本化，从而在这些层状材料中工程化新的性质。据估计，插入的氧气使每两个晶粒中的约一个略微移位，这表明晶粒镶嵌性显着增加，同时仍保持原始的{−2 0 1}面外纹理。将这些结构转变与观察到的电学和光学性质的变化相关联，将能够使使用吸附剂的资本化，从而在这些层状材料中工程化新的性质。

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Long‐Term Structural Evolution of an Intercalated Layered Semiconductor

Intercalated molecules can dramatically modify the electronic band structure of layered semiconductors, significantly altering the optical properties of the material. In the layered monochalcogenide Gallium Telluride (GaTe), exposure to air induces a nearly 1 eV reduction of its band gap due to the interlayer diffusion and chemisorption of oxygen. The effect of oxygen chemisorption at the Te‐terminated surfaces on the structure of GaTe, however, is much less known. To better understand the structure–property relationship of intercalated GaTe, a systematic, long‐term, X‐ray diffraction study has been performed on GaTe exfoliated crystals exposed to ambient conditions. It is observed that the structural changes are not limited to a previously observed short‐term increase in lattice expansion. Over the course of months and even years after exfoliation, the oxygen adsorbates continue to modify the structure of GaTe, inducing significant disorder and grain reorientation. It is estimated that approximately one out of every two grains is slightly displaced by the intercalating oxygen, demonstrating a significant increase in grain mosaicity, while still maintaining the original {−2 0 1} out‐of‐plane texture. Correlating these structural transformations to observed changes in electrical and optical properties will enable capitalization of the use of adsorbates to engineer novel properties in these layered materials.

更新日期：2017-03-01

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