Pulse I-V characterization of a nanocrystalline oxide device with sub-gap density of states

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Understanding the charge trapping nature of nano-crystalline oxide semiconductor thin film transistors (TFTs) is one of the most important requirements for their successful application. In our investigation, we employed a fast-pulsed I-V technique for understanding the charge trapping phenomenon and for characterizing the intrinsic device performance of an amorphous/nano-crystalline indium-hafnium-zinc-oxide semiconductor TFT with varying density of states in the bulk. Because of the negligible transient charging effect with a very short pulse, the source-to-drain current obtained with the fast-pulsed I-V measurement was higher than that measured by the direct-current characterization method. This is because the fast-pulsed I-V technique provides a charge-trap free environment, suggesting that it is a representative device characterization methodology of TFTs. In addition, a pulsed source-to-drain current versus time plot was used to quantify the dynamic trapping behavior. We found that the charge trapping phenomenon in amorphous/nano-crystalline indium-hafnium-zinc-oxide TFTs is attributable to the charging/discharging of sub-gap density of states in the bulk and is dictated by multiple trap-to-trap processes.
Publisher
IOP PUBLISHING LTD
Issue Date
2016-05
Language
English
Article Type
Article
Keywords

THIN-FILM TRANSISTORS; ELECTRON-TRAPPING CHARACTERIZATION; GATE DIELECTRICS; G METHODOLOGY; PERFORMANCE; INSTABILITY; INTERFACE; STRESS

Citation

NANOTECHNOLOGY, v.27, no.21

ISSN
0957-4484
DOI
10.1088/0957-4484/27/21/215203
URI
http://hdl.handle.net/10203/240762
Appears in Collection
EE-Journal Papers(저널논문)
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