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Bi-Assisted CdTe/CdS Hierarchical Nanostructure Growth for Photoconductive Applications.

Heo K, Lee H, Jian J, Lee DJ, Park Y, Lee C, Lee BY, Hong S - Nanoscale Res Lett (2015)

Bottom Line: As a proof of concepts, we grew CdTe/CdS branched nanowires for the fabrication of photodetectors.The hierarchical nanostructure-based photodetectors showed an improved photoresponsivity compared to the single CdTe nanowire (NW)-based photodetector.Our strategy can be a simple but powerful method for the development of advanced optoelectronic devices and other practical applications.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Republic of Korea, kheo@sejong.ac.kr.

ABSTRACT
We developed a method to control the structure of CdTe nanowires by adopting Bi-mixed CdTe powder source to a catalyst-assisted chemical vapor deposition, which allowed us to fabricate CdTe/CdS hierarchical nanostructures. We demonstrated that diverse nanostructures can be grown depending on the combination of the Bi powder and film catalysts. As a proof of concepts, we grew CdTe/CdS branched nanowires for the fabrication of photodetectors. The hierarchical nanostructure-based photodetectors showed an improved photoresponsivity compared to the single CdTe nanowire (NW)-based photodetector. Our strategy can be a simple but powerful method for the development of advanced optoelectronic devices and other practical applications.

No MeSH data available.


Fabrication of CdTe/CdS hierarchical nanostructures. a SEM images of CdTe-coated CdS NWs. b SEM images of CdTe/CdS hierarchical nanostructures. c TEM images of CdTe/CdS hierarchical nanostructures. The inset shows the magnified TEM image of CdTe NWs. d EDS measurement of CdTe/CdS hierarchical nanostructures
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Fig3: Fabrication of CdTe/CdS hierarchical nanostructures. a SEM images of CdTe-coated CdS NWs. b SEM images of CdTe/CdS hierarchical nanostructures. c TEM images of CdTe/CdS hierarchical nanostructures. The inset shows the magnified TEM image of CdTe NWs. d EDS measurement of CdTe/CdS hierarchical nanostructures

Mentions: One of the advantages of the Bi-assisted CdTe nanostructures is that they can be directly utilized as building blocks for various hierarchical nanostructures. We demonstrated the fabrication of hierarchical nanostructures consisting of n-type CdS NWs and p-type CdTe NWs (or films). The detailed fabrication process is described in the “Methods” section. First, when pure CdTe powder source and Bi catalyst were used to grow the secondary nanostructures, we could obtain the CdS NWs coated with CdTe films (Fig. 3a). On the other hand, when we used the mixed powder (CdTe:Bi = 10:1) as a source material and an 8-nm-thick Au film as a catalyst, we could obtain a hierarchical nanostructure composed of CdTe NWs branched on the seeding CdS NWs (CdTe/CdS NWs) as shown in Fig. 3b. Note that this result is consistent with that shown in Fig. 2a, c.Fig. 3


Bi-Assisted CdTe/CdS Hierarchical Nanostructure Growth for Photoconductive Applications.

Heo K, Lee H, Jian J, Lee DJ, Park Y, Lee C, Lee BY, Hong S - Nanoscale Res Lett (2015)

Fabrication of CdTe/CdS hierarchical nanostructures. a SEM images of CdTe-coated CdS NWs. b SEM images of CdTe/CdS hierarchical nanostructures. c TEM images of CdTe/CdS hierarchical nanostructures. The inset shows the magnified TEM image of CdTe NWs. d EDS measurement of CdTe/CdS hierarchical nanostructures
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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Fig3: Fabrication of CdTe/CdS hierarchical nanostructures. a SEM images of CdTe-coated CdS NWs. b SEM images of CdTe/CdS hierarchical nanostructures. c TEM images of CdTe/CdS hierarchical nanostructures. The inset shows the magnified TEM image of CdTe NWs. d EDS measurement of CdTe/CdS hierarchical nanostructures
Mentions: One of the advantages of the Bi-assisted CdTe nanostructures is that they can be directly utilized as building blocks for various hierarchical nanostructures. We demonstrated the fabrication of hierarchical nanostructures consisting of n-type CdS NWs and p-type CdTe NWs (or films). The detailed fabrication process is described in the “Methods” section. First, when pure CdTe powder source and Bi catalyst were used to grow the secondary nanostructures, we could obtain the CdS NWs coated with CdTe films (Fig. 3a). On the other hand, when we used the mixed powder (CdTe:Bi = 10:1) as a source material and an 8-nm-thick Au film as a catalyst, we could obtain a hierarchical nanostructure composed of CdTe NWs branched on the seeding CdS NWs (CdTe/CdS NWs) as shown in Fig. 3b. Note that this result is consistent with that shown in Fig. 2a, c.Fig. 3

Bottom Line: As a proof of concepts, we grew CdTe/CdS branched nanowires for the fabrication of photodetectors.The hierarchical nanostructure-based photodetectors showed an improved photoresponsivity compared to the single CdTe nanowire (NW)-based photodetector.Our strategy can be a simple but powerful method for the development of advanced optoelectronic devices and other practical applications.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Republic of Korea, kheo@sejong.ac.kr.

ABSTRACT
We developed a method to control the structure of CdTe nanowires by adopting Bi-mixed CdTe powder source to a catalyst-assisted chemical vapor deposition, which allowed us to fabricate CdTe/CdS hierarchical nanostructures. We demonstrated that diverse nanostructures can be grown depending on the combination of the Bi powder and film catalysts. As a proof of concepts, we grew CdTe/CdS branched nanowires for the fabrication of photodetectors. The hierarchical nanostructure-based photodetectors showed an improved photoresponsivity compared to the single CdTe nanowire (NW)-based photodetector. Our strategy can be a simple but powerful method for the development of advanced optoelectronic devices and other practical applications.

No MeSH data available.