Cation Exchange Enabled Cu Dopants Location Tailoring and Photoelectric Properties Regulation in CdS Nanosheets.

Cation Exchange Enabled Cu Dopants Location Tailoring and Photoelectric Properties Regulation in CdS Nanosheets.
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CdS 纳米片中启用阳离子交换的铜掺杂剂位置调整和光电特性调节

DOI:
10.1021/acs.jpclett.1c00850
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发表时间:
2021-04
期刊:
The journal of physical chemistry letters
影响因子:
--
通讯作者:
Meng Xu
Meng Xu
中科院分区:
其他
文献类型:
--
作者:
Changsheng Song;Jiajia Liu;Shuman Jia;Bing Bai;Hongpan Rong;Jiatao Zhang;Meng Xu

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低维半导体纳米结构中掺杂相关的点缺陷工程对调节其光学和电子性能具有重要意义。杂价掺杂剂的取代或间隙位置至关重要,但尚未得到有效控制。在此,我们仔细控制CuxS二维纳米片与配体配位Cd2+阳离子之间的反向阳离子交换动力学,以控制CdS纳米片(NSs)中的Cu掺杂位点。通过球面像差校正透射电镜(SACTEM)和x射线吸收光谱(XAS)配位研究直接证实了取代型和间隙型铜掺杂物的存在。密度泛函理论(DFT)计算及其实验电导率和掺杂发光性能证明了由于不同铜掺杂的位置而产生的巨大差异。这些发现对掺杂剂在纳米结构宿主半导体中的位置调控提供了更深入的见解。
Doping-related point defect engineering in low-dimensional semiconductor nanostructures is important to regulate their optical and electronic properties. The substitutional or interstitial location of heterovalent dopants is critical and has not been controlled effectively yet. Herein, we carefully control the kinetics of reverse cation exchange between CuxS 2D nanosheets and ligand-coordinated Cd2+ cations to control the Cu doping sites in CdS nanosheets (NSs). The substitutional and interstitial Cu dopants were directly confirmed by spherical aberration-corrected TEM (SACTEM) and their X-ray absorption spectroscopy (XAS) coordination investigation. Density functional theory (DFT) calculations and their experimental conductivities and dopant luminescence performance demonstrated the dramatic differences that are due to the location of different Cu dopants. These findings provide deeper insights on dopants' location regulation in a nanostructured host semiconductor.
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