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硒化镉-碲化镉异质结纳米棒：碲化镉段在调节电荷转移过程中的作用

CdSe-CdTe Heterojunction Nanorods: Role of CdTe Segment in Modulating the Charge Transfer Processes.

作者信息

Subila Kurukkal Balakrishnan, Sandeep Kulangara, Thomas Elizabeth Mariam, Ghatak Jay, Shivaprasad Sonnada Math, Thomas K George

机构信息

School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Vithura, Maruthamala (PO), Thiruvananthapuram 695551, India.

Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur (PO), Bangalore 560064, India.

出版信息

ACS Omega. 2017 Aug 30;2(8):5150-5158. doi: 10.1021/acsomega.7b00995. eCollection 2017 Aug 31.

DOI:10.1021/acsomega.7b00995
PMID:31457790
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6641699/
Abstract

Heterojunction nanorods having dissimilar semiconductors possess charge transfer (CT) properties and are proposed as active elements in optoelectronic systems. Herein, we describe the synthetic methodologies for controlling the charge carrier recombination dynamics in CdSe-CdTe heterojunction nanorods through the precise growth of CdTe segment from one of the tips of CdSe nanorods. The location of heterojunction was established through a point-by-point collection of the energy-dispersive X-ray spectra using scanning transmission electron microscopy. The possibilities of the growth of CdTe from both the tips of CdSe nanorods and the overcoating of CdTe over CdSe segment were also ruled out. The CT emission in the heterojunction nanorods originates through an interfacial excitonic recombination and was further tuned to the near-infrared region by varying the two parameters: the aspect ratio of CdSe and the length of CdTe segment. These aspects are evidenced from the emission lifetime and the femtosecond transient absorption studies.

摘要

具有不同半导体的异质结纳米棒具有电荷转移（CT）特性，并被提议作为光电子系统中的活性元件。在此，我们描述了通过从CdSe纳米棒的一个尖端精确生长CdTe段来控制CdSe-CdTe异质结纳米棒中电荷载流子复合动力学的合成方法。使用扫描透射电子显微镜通过逐点收集能量色散X射线光谱确定了异质结的位置。从CdSe纳米棒的两个尖端生长CdTe以及在CdSe段上包覆CdTe的可能性也被排除。异质结纳米棒中的CT发射源于界面激子复合，并通过改变两个参数进一步调谐到近红外区域：CdSe的纵横比和CdTe段的长度。这些方面从发射寿命和飞秒瞬态吸收研究中得到了证明。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/be7a64f59998/ao-2017-00995u_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/5ddf81c7fa23/ao-2017-00995u_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/724dc05e3a5b/ao-2017-00995u_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/a09c896e6051/ao-2017-00995u_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/24b2a47b28f8/ao-2017-00995u_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/bdb03c2288c2/ao-2017-00995u_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/be7a64f59998/ao-2017-00995u_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/5ddf81c7fa23/ao-2017-00995u_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/724dc05e3a5b/ao-2017-00995u_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/a09c896e6051/ao-2017-00995u_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/24b2a47b28f8/ao-2017-00995u_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/bdb03c2288c2/ao-2017-00995u_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8b4d/6641699/be7a64f59998/ao-2017-00995u_0005.jpg

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