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Extended Short-Wavelength Infrared Photoluminescence and Photocurrent of Nonstoichiometric Silver Telluride Colloidal Nanocrystals
Nano Letters ( IF 9.6 ) Pub Date : 2021-09-15 , DOI: 10.1021/acs.nanolett.1c02407
Gahyeon Kim 1 , Dongsun Choi 1 , So Young Eom 1 , Haemin Song 1 , Kwang Seob Jeong 1
Affiliation  

Demands on nontoxic nanomaterials in the short-wavelength infrared (SWIR) have rapidly grown over the past decade. Here, we present the nonstoichiometric silver chalcogenide nanocrystals of AgxTe (x > 2) and Ag2Te/Ag2S CQDs with a tunable bandgap across the SWIR region. When the atomic percent of the metal and chalcogenide elements are varied, the emission frequency of the excitonic peak is successfully extended to 2.7 μm. Surprisingly, the AgxTe CQD film responds to the SWIR light with a responsivity of 2.1 A/W at 78 K. Also, the Ag2S shell growth over the Ag2Te core enhances not only the emission intensity but also the structural rigidity, preventing crystal morphology deformation under the electron beam. The origin of the enhancement in the emission intensity and air stability of AgxTe and Ag2Te/Ag2S CQDs is carefully investigated by X-ray photoelectron spectroscopy (XPS). The optical properties and infrared photocurrent of AgxTe CQDs will provide new opportunities for solution-based SWIR applications.

中文翻译:

非化学计量碲化银胶体纳米晶体的扩展短波红外光致发光和光电流

在过去十年中,对短波红外 (SWIR) 无毒纳米材料的需求迅速增长。在这里,我们提出了非化学计量的银硫属化物纳米晶体 Ag x Te ( x > 2) 和 Ag 2 Te/Ag 2 S CQD,在 SWIR 区域具有可调带隙。当金属和硫属元素化物元素的原子百分比发生变化时,激子峰的发射频率成功地扩展到 2.7 μm。令人惊讶的是,Ag x Te CQD 薄膜对 SWIR 光的响应在 78 K 时的响应率为 2.1 A/W。此外,Ag 2 S 壳层在 Ag 2Te 核不仅增强了发射强度,还增强了结构刚度,防止了电子束下的晶体形貌变形。通过 X 射线光电子能谱 (XPS) 仔细研究了Ag x Te 和 Ag 2 Te/Ag 2 S CQD的发射强度和空气稳定性增强的原因。Ag x Te CQD的光学特性和红外光电流将为基于溶液的 SWIR 应用提供新的机会。
更新日期:2021-10-13
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