High quality ZnO-TiO                         2                          core-shell nanowires for efficient ultraviolet sensing

Dali Shao; Hongtao Sun; Guoqing Xin; Jie Lian; Shayla Sawyer

doi:10.1016/j.apsusc.2014.06.182

High quality ZnO-TiO ₂ core-shell nanowires for efficient ultraviolet sensing

Dali Shao, Hongtao Sun, Guoqing Xin, Jie Lian, Shayla Sawyer

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

High quality ZnO-TiO ₂ core-shell nanowires (NWs) have been fabricated via a facile two-step method: growth of ZnO nanowires by hydrothermal synthesis and then coating of highly uniform TiO ₂ shell using atomic layer deposition (ALD) technique. The ultraviolet (UV) emission intensity of the ZnO-TiO ₂ core-shell NWs is largely quenched due to an efficient electron-hole separation that reduces the band-to-band recombinations. To the contrary, the absorption of the ZnO-TiO ₂ core-shell NWs in both UV and visible region is enhanced, which is attributed to the antireflection properties of the TiO ₂ shell. An UV photodetector fabricated from the ZnO-TiO ₂ core-shell NWs showed a maximum photoresponsivity as high as 495 A/W at 373 nm under -10 V, which is ∼8 times higher than that of the photodetector fabricated from bare ZnO NWs. In addition, the transient response of the ZnO-TiO ₂ core-shell NWs is improved by 6 times as compared to that of the bare ZnO NWs. The results presented in this work suggest that ZnO-TiO ₂ core-shell NWs may be promising for various optoelectronics applications including: UV photodetectors, optical switches, optical fibers and solar cells.

Original language	English (US)
Pages (from-to)	872-876
Number of pages	5
Journal	Applied Surface Science
Volume	314
DOIs	https://doi.org/10.1016/j.apsusc.2014.06.182
State	Published - Sep 30 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Surfaces, Coatings and Films
Surfaces and Interfaces

Keywords

Heterojunction
Photoresponsivity
UV photodetector

Access to Document

10.1016/j.apsusc.2014.06.182

Cite this

@article{8b05955c583a4ea9ad23957d55bad1f5,

title = " High quality ZnO-TiO 2 core-shell nanowires for efficient ultraviolet sensing ",

abstract = " High quality ZnO-TiO 2 core-shell nanowires (NWs) have been fabricated via a facile two-step method: growth of ZnO nanowires by hydrothermal synthesis and then coating of highly uniform TiO 2 shell using atomic layer deposition (ALD) technique. The ultraviolet (UV) emission intensity of the ZnO-TiO 2 core-shell NWs is largely quenched due to an efficient electron-hole separation that reduces the band-to-band recombinations. To the contrary, the absorption of the ZnO-TiO 2 core-shell NWs in both UV and visible region is enhanced, which is attributed to the antireflection properties of the TiO 2 shell. An UV photodetector fabricated from the ZnO-TiO 2 core-shell NWs showed a maximum photoresponsivity as high as 495 A/W at 373 nm under -10 V, which is ∼8 times higher than that of the photodetector fabricated from bare ZnO NWs. In addition, the transient response of the ZnO-TiO 2 core-shell NWs is improved by 6 times as compared to that of the bare ZnO NWs. The results presented in this work suggest that ZnO-TiO 2 core-shell NWs may be promising for various optoelectronics applications including: UV photodetectors, optical switches, optical fibers and solar cells.",

keywords = "Heterojunction, Photoresponsivity, UV photodetector",

author = "Dali Shao and Hongtao Sun and Guoqing Xin and Jie Lian and Shayla Sawyer",

note = "Funding Information: The authors gratefully acknowledge support from National Security Technologies through NSF Industry/University Cooperative Research Center Connection One . The authors also acknowledge the National Science Foundation Smart Lighting Engineering Research Center ( EEC-0812056 ) and a NSF career award DMR 1151028.",

year = "2014",

month = sep,

day = "30",

doi = "10.1016/j.apsusc.2014.06.182",

language = "English (US)",

volume = "314",

pages = "872--876",

journal = "Applied Surface Science",

issn = "0169-4332",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - High quality ZnO-TiO 2 core-shell nanowires for efficient ultraviolet sensing

AU - Shao, Dali

AU - Sun, Hongtao

AU - Xin, Guoqing

AU - Lian, Jie

AU - Sawyer, Shayla

N1 - Funding Information: The authors gratefully acknowledge support from National Security Technologies through NSF Industry/University Cooperative Research Center Connection One . The authors also acknowledge the National Science Foundation Smart Lighting Engineering Research Center ( EEC-0812056 ) and a NSF career award DMR 1151028.

PY - 2014/9/30

Y1 - 2014/9/30

N2 - High quality ZnO-TiO 2 core-shell nanowires (NWs) have been fabricated via a facile two-step method: growth of ZnO nanowires by hydrothermal synthesis and then coating of highly uniform TiO 2 shell using atomic layer deposition (ALD) technique. The ultraviolet (UV) emission intensity of the ZnO-TiO 2 core-shell NWs is largely quenched due to an efficient electron-hole separation that reduces the band-to-band recombinations. To the contrary, the absorption of the ZnO-TiO 2 core-shell NWs in both UV and visible region is enhanced, which is attributed to the antireflection properties of the TiO 2 shell. An UV photodetector fabricated from the ZnO-TiO 2 core-shell NWs showed a maximum photoresponsivity as high as 495 A/W at 373 nm under -10 V, which is ∼8 times higher than that of the photodetector fabricated from bare ZnO NWs. In addition, the transient response of the ZnO-TiO 2 core-shell NWs is improved by 6 times as compared to that of the bare ZnO NWs. The results presented in this work suggest that ZnO-TiO 2 core-shell NWs may be promising for various optoelectronics applications including: UV photodetectors, optical switches, optical fibers and solar cells.

AB - High quality ZnO-TiO 2 core-shell nanowires (NWs) have been fabricated via a facile two-step method: growth of ZnO nanowires by hydrothermal synthesis and then coating of highly uniform TiO 2 shell using atomic layer deposition (ALD) technique. The ultraviolet (UV) emission intensity of the ZnO-TiO 2 core-shell NWs is largely quenched due to an efficient electron-hole separation that reduces the band-to-band recombinations. To the contrary, the absorption of the ZnO-TiO 2 core-shell NWs in both UV and visible region is enhanced, which is attributed to the antireflection properties of the TiO 2 shell. An UV photodetector fabricated from the ZnO-TiO 2 core-shell NWs showed a maximum photoresponsivity as high as 495 A/W at 373 nm under -10 V, which is ∼8 times higher than that of the photodetector fabricated from bare ZnO NWs. In addition, the transient response of the ZnO-TiO 2 core-shell NWs is improved by 6 times as compared to that of the bare ZnO NWs. The results presented in this work suggest that ZnO-TiO 2 core-shell NWs may be promising for various optoelectronics applications including: UV photodetectors, optical switches, optical fibers and solar cells.

KW - Heterojunction

KW - Photoresponsivity

KW - UV photodetector

UR - http://www.scopus.com/inward/record.url?scp=84906785056&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84906785056&partnerID=8YFLogxK

U2 - 10.1016/j.apsusc.2014.06.182

DO - 10.1016/j.apsusc.2014.06.182

M3 - Article

AN - SCOPUS:84906785056

SN - 0169-4332

VL - 314

SP - 872

EP - 876

JO - Applied Surface Science

JF - Applied Surface Science

ER -