Electrical instability of amorphous indium-gallium-zinc oxide thin film transistors under monochromatic light illumination
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Huang, Xiaoming; Wu, Chenfei; Lu, Hai; Ren, Fangfang; Xu, Qingyu; Ou, Huiling; Zhang, Rong; Zheng, Youdou
Description
The electrical instability behaviors of a positive-gate-bias-stressed amorphous indium-gallium-zinc oxide (a-IGZO) thin film transistor(TFT) are studied under monochromatic light illumination. It is found that as the wavelength of incident light reduces from 750 nm to 450 nm, the threshold voltage of the illuminated TFT shows a continuous negative shift, which is caused by photo-excitation of trapped electrons at the channel/dielectric interface. Meanwhile, an increase of the sub-threshold...[Show more]
dc.contributor.author | Huang, Xiaoming | |
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dc.contributor.author | Wu, Chenfei | |
dc.contributor.author | Lu, Hai | |
dc.contributor.author | Ren, Fangfang | |
dc.contributor.author | Xu, Qingyu | |
dc.contributor.author | Ou, Huiling | |
dc.contributor.author | Zhang, Rong | |
dc.contributor.author | Zheng, Youdou | |
dc.date.accessioned | 2015-10-28T01:05:23Z | |
dc.date.available | 2015-10-28T01:05:23Z | |
dc.identifier.issn | 0003-6951 | |
dc.identifier.uri | http://hdl.handle.net/1885/16143 | |
dc.description.abstract | The electrical instability behaviors of a positive-gate-bias-stressed amorphous indium-gallium-zinc oxide (a-IGZO) thin film transistor(TFT) are studied under monochromatic light illumination. It is found that as the wavelength of incident light reduces from 750 nm to 450 nm, the threshold voltage of the illuminated TFT shows a continuous negative shift, which is caused by photo-excitation of trapped electrons at the channel/dielectric interface. Meanwhile, an increase of the sub-threshold swing (SS) is observed when the illumination wavelength is below 625 nm (∼2.0 eV). The SS degradation is accompanied by a simultaneous increase of the field effect mobility (μFE) of the TFT, which then decreases at even shorter wavelength beyond 540 nm (∼2.3 eV). The variation of SS and μFE is explained by a physical model based on generation of singly ionized oxygen vacancies (Vo⁺) and double ionized oxygen vacancies (Vo²⁺) within the a-IGZO active layer by high energy photons, which would form trap states near the mid-gap and the conduction band edge, respectively. | |
dc.description.sponsorship | This work was supported by the State Key Program for Basic Research of China under Grant Nos. 2010CB327504, 2011CB922100, 2011CB301900; the National Natural Science Foundation of China under Grant Nos. 60825401, 60936004, 11104130, BK2011556, and BK2011050. | |
dc.publisher | American Institute of Physics (AIP) | |
dc.rights | http://www.sherpa.ac.uk/romeo/issn/0003-6951..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 28/10/15). Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters and may be found at https://doi.org/10.1063/1.4729478 | |
dc.source | Applied Physics Letters | |
dc.subject | Keywords: Active Layer; Conduction band edge; Electrical instability; Field-effect mobilities; High energy photons; Incident light; Monochromatic light; Negative shift; Oxide thin films; Photo-excitations; Physical model; Shorter wavelength; Singly ionized oxygen; | |
dc.title | Electrical instability of amorphous indium-gallium-zinc oxide thin film transistors under monochromatic light illumination | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 100 | |
dc.date.issued | 2012-06-14 | |
local.identifier.absfor | 020406 | |
local.identifier.absfor | 090605 | |
local.identifier.ariespublication | U3488905xPUB715 | |
local.publisher.url | https://www.aip.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Huang, Xiaoming, Nanjing University, China | |
local.contributor.affiliation | Wu, Chenfei, Nanjing University, China | |
local.contributor.affiliation | Lu, Hai, Nanjing University, China | |
local.contributor.affiliation | Ren, Fang-Fang, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Department of Electronic Materials Engineering, The Australian National University | |
local.contributor.affiliation | Xu, Qingyu, Southeast University, China | |
local.contributor.affiliation | Ou, Huiling, Southeast University, China | |
local.contributor.affiliation | Zhang, R., Nanjing University, China | |
local.contributor.affiliation | Zheng, Youdou, Nanjing University, China | |
local.bibliographicCitation.issue | 24 | |
local.bibliographicCitation.startpage | 243505 | |
local.identifier.doi | 10.1063/1.4729478 | |
local.identifier.absseo | 970102 | |
dc.date.updated | 2016-02-24T10:12:43Z | |
local.identifier.scopusID | 2-s2.0-84863328333 | |
Collections | ANU Research Publications |
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