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Origin of green emission and charge trapping dynamics in ZnO nanowires

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Origin of green emission and charge trapping dynamics in ZnO nanowires
นักวิจัย : Li, Mingjie , Xing, Guichuan , Xing, Guozhong , Wu, Bo , Wu, Tom , Zhang, Xinhai , Sum, Tze Chien
คำค้น : DRNTU::Science::Mathematics
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2556
อ้างอิง : Li, M., Xing, G., Xing, G., Wu, B., Wu, T., Zhang, X., & Sum, T. C. (2013). Origin of green emission and charge trapping dynamics in ZnO nanowires. Physical Review B, 87(11), 115309-. , http://hdl.handle.net/10220/9912 , http://dx.doi.org/10.1103/PhysRevB.87.115309 , 172787
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Physical review B
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The origins of the commonly observed green emission (GE) from ZnO nanostructures remain highly controversial despite extensive studies over the past few decades. Herein, through a comprehensive ultrafast optical spectroscopy study, new insights into its origin and the charge trapping dynamics at the GE centers in ZnO nanowires prepared by the vapor transport method are gained. Transient absorption spectroscopy (TAS) revealed a sub-band-gap absorption bleaching band arising from the state filling of the electrons in the conduction band and holes trapped in the GE centers. The GE originates from the recombination between the electrons in the conduction band and/or shallow donor levels and the holes trapped at the GE centers (which are located at ∼0.88 eV above the valence band). Importantly, an ultrafast excitonic Auger-type hole trapping process to the GE centers occurring in a subpicosecond time scale was also uncovered by TAS—shedding new light on the mechanism behind the fast and efficient charge trapping of photoexcited carriers. The knowledge gained is crucial for the development of ZnO-based optoelectronic devices.

บรรณานุกรม :
Li, Mingjie , Xing, Guichuan , Xing, Guozhong , Wu, Bo , Wu, Tom , Zhang, Xinhai , Sum, Tze Chien . (2556). Origin of green emission and charge trapping dynamics in ZnO nanowires.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Li, Mingjie , Xing, Guichuan , Xing, Guozhong , Wu, Bo , Wu, Tom , Zhang, Xinhai , Sum, Tze Chien . 2556. "Origin of green emission and charge trapping dynamics in ZnO nanowires".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Li, Mingjie , Xing, Guichuan , Xing, Guozhong , Wu, Bo , Wu, Tom , Zhang, Xinhai , Sum, Tze Chien . "Origin of green emission and charge trapping dynamics in ZnO nanowires."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2556. Print.
Li, Mingjie , Xing, Guichuan , Xing, Guozhong , Wu, Bo , Wu, Tom , Zhang, Xinhai , Sum, Tze Chien . Origin of green emission and charge trapping dynamics in ZnO nanowires. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2556.