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Tailoring the charge carrier dynamics in ZnO nanowires : the role of surface hole/electron traps

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Tailoring the charge carrier dynamics in ZnO nanowires : the role of surface hole/electron traps
นักวิจัย : Li, Mingjie , Xing, Guichuan , Qune, Lloyd Foong Nien Ah , Xing, Guozhong , Wu, Tom , Huan, Alfred Cheng Hon , Zhang, Xinhai , Sum, Tze Chien
คำค้น : DRNTU::Science::Chemistry::Physical chemistry.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Li, M., Xing, G., Qune, L. F. N. A., Xing, G., Wu, T., Huan, A. C. H., & et al. (2012). Tailoring the charge carrier dynamics in ZnO nanowires: the role of surface hole/electron traps. Physical Chemistry Chemical Physics, 14, 3075-3082. , http://hdl.handle.net/10220/7528 , http://dx.doi.org/10.1039/c2cp23425d , 162953
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physical chemistry chemical physics
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Post-fabrication thermal-annealed ZnO nanowires (NWs) in an oxidizing (or a reducing) ambient were investigated using transient photoluminescence and X-ray photoelectron spectroscopy. Our findings reveal an ultrafast hole-transfer process to the surface adsorbed oxygen species (e.g. O2-, ) occurring within a few hundred picoseconds (ps) in the air-annealed samples; and an ultrafast electron-transfer process to charged oxygen vacancies (i.e. Vo2+, ) occurring within tens of ps in the H2-annealed samples. Contrary to the common perception that the bandedge emission (BE) dynamics are strongly influenced by the carrier trapping to the green emission related defect states (i.e., VZn), these above processes compete effectively with the ZnO BE. Hole trapping by ionized VZn, which occurs in an ultrashort sub-ps-to-ps timescale (and hence limits its effective hole capture radius), however, has less influence on the BE dynamics. Importantly, our findings shed new light on the photoinduced charge transfer processes that underpins the novel properties of enhanced photocatalytic activity, photovoltaic performance, and photoconductivity response of ZnO NWs; thereby suggesting a strategy for tailoring the ultrafast carrier dynamics in ZnO NW-based devices.

บรรณานุกรม :
Li, Mingjie , Xing, Guichuan , Qune, Lloyd Foong Nien Ah , Xing, Guozhong , Wu, Tom , Huan, Alfred Cheng Hon , Zhang, Xinhai , Sum, Tze Chien . (2555). Tailoring the charge carrier dynamics in ZnO nanowires : the role of surface hole/electron traps.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Li, Mingjie , Xing, Guichuan , Qune, Lloyd Foong Nien Ah , Xing, Guozhong , Wu, Tom , Huan, Alfred Cheng Hon , Zhang, Xinhai , Sum, Tze Chien . 2555. "Tailoring the charge carrier dynamics in ZnO nanowires : the role of surface hole/electron traps".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Li, Mingjie , Xing, Guichuan , Qune, Lloyd Foong Nien Ah , Xing, Guozhong , Wu, Tom , Huan, Alfred Cheng Hon , Zhang, Xinhai , Sum, Tze Chien . "Tailoring the charge carrier dynamics in ZnO nanowires : the role of surface hole/electron traps."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Li, Mingjie , Xing, Guichuan , Qune, Lloyd Foong Nien Ah , Xing, Guozhong , Wu, Tom , Huan, Alfred Cheng Hon , Zhang, Xinhai , Sum, Tze Chien . Tailoring the charge carrier dynamics in ZnO nanowires : the role of surface hole/electron traps. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.