Extraction of density of localized states in indium zinc oxide thin film transistor

Wang Jing; Liu Yuan; Liu Yu-Rong; Wu Wei-Jing; Luo Xin-Yue; Liu Kai; Li Bin; En Yun-Fei

doi:10.7498/aps.65.128501

Abstract

Density of localized states (DOS) over the band-gap determines the electrical and instability characteristics in the indium zinc oxide thin film transistor (IZO TFT). In order to propose an accurate extraction method for DOS in the bulk region, low frequency noise and multi-frequency capacitance voltage characteristics are measured and analyzed in this paper. Firstly, the relationship between surface potential and gate voltage is extracted based on subthreshold I-V characteristics. The extraction results show that the surface potential increases with the increase of gate voltage in the sub-threshold region. When the Fermi level is close to the bottom of conduction band, the increase of surface potential should be saturated. Secondly, drain current noise power spectral densities in the IZO TFTs under different operation modes are measured. Based on carrier number fluctuation mechanism, the flat-band voltage noise power spectral density is extracted and localized state near IZO/SiO2 interface is then calculated. By considering the emission and trapping processes of carriers between localized states, the distribution of bulk trap density in the band-gap is extracted based on low frequency noise measurement results. The experimental results show an exponential tail state distribution in the band-gap while NTA is about 3.421020 cm-3eV-1 and TTA is about 135 K. Subsequently, contact resistances are then extracted by combining capacitance-voltage characteristics with I-V characteristics in the linear region. The extrinsic parasitic resistances at gate, source, drain are separated. By considering charges trapped in the localized states and free carriers, the distributions of deep states and tail states in the active layer of IZO TFT are extracted through multi-frequency capacitance-voltage characteristics. The experimental results also show an exponential deep state and tail state distribution in the band-gap while NDA is about 5.41015 cm-3eV-1, TDA is about 711 K, NTA is about 1.991020 cm-3eV-1, and TTA is about 183 K. The above two proposed extraction methods are compared and analyzed. The deviation between two extraction results may relate to the existence of neutral trap in the gate dielectric which is also an important source of low frequency noise in the IZO TFT.

Keywords:

Authors and contacts

1.
School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, China;
2.
Science and Technology on Reliability Physics and Application of Electronic Component Laboratory, CEPREI, Guangzhou 510610, China;
3.
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China

Corresponding author: Liu Yuan, liuyuan@ceprei.com

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 61574048, 61574062, 61204112) and the Natural Science Foundation of Guangdong Province, China (Grant Nos. 2014A030313656, 2015A030306002).

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[31]	Vogel E M, Henson W K, Richter C A, Suehle J S 2000 IEEE Trans. Electron Devices 47 601

Cited By

[1]	Lan L, Xiong N, Xiao P, Li M, Xu H, Yao R, Wen S, Peng J 2013 Appl. Phys Lett. 102 242102
[2]	Li X F, Xin E L, Shi J F, Chen L L, Li C Y, Zhang J H 2013 Acta Phys. Sin. 62 108503 (in Chinese) [李喜峰, 信恩龙, 石继锋, 陈龙龙, 李春亚, 张建华 2013 62 108503]
[3]	Yu G, Wu C F, Lu H, Ren F F, Zhang R, Zheng Y D, Huang X M 2015 Chin. Phys. Lett. 32 047302
[4]	Kimura M, Nakanishi T, Nomura K, Kamiya T, Hosono H 2008 Appl. Phys. Lett. 92 133512
[5]	Hsieh H H, Kamiya T, Nomura K, Hosono H, Wu C C 2008 Appl. Phys. Lett. 92 133503
[6]	Tang L F, Yu G, Lu H, Wu C F, Qian H M, Zhou D, Zhang R, Zheng Y D, Huang X M 2015 Chin. Phys. B 24 088504
[7]	Liu Y R, Su J, Lai P T, Yao R H 2014 Chin. Phys. B 23 068501
[8]	Bae H, Choi H, Oh S, Kim D H, Bae J, Kim J, Kim Y H, Kim D M 2013 IEEE Electron Device Lett. 34 57
[9]	Park J H, Jeon K, Lee S, Kim S, Kim S, Song I, Kim C J, Park J, Park Y, Kim D M, Kim D H 2008 IEEE Electron Device Lett. 29 1292
[10]	Lee S, Park S, Kim S, Jeon Y, Jeon K, Park J H, Park J, Song I, Kim C J, Park Y, Kim D M, Kim D H 2010 IEEE Electron Device Lett. 31 231
[11]	Bae H, Jun S, Jo C H, Choi H, Lee J, Kim Y H, Hwang S, Jeong H K, Hur I, Kim W, Yun D, Hong E, Seo H, Kim D H, Kim D M 2012 IEEE Electron Device Lett. 33 1138
[12]	Kim Y, Bae M, Kim W, Kong D, Jeong H K, Kim H, Choi S, Kim D M, Kim D H 2012 IEEE Trans. Electron Devices 59 2689
[13]	Xu P R, Qiang L, Yao R H 2015 Acta Phys. Sin. 64 137101 (in Chinese) [徐飘荣, 强蕾, 姚若河 2015 64 137101]
[14]	Liu Y, Wu W J, Li B, En Y F, Wang L, Liu Y R 2014 Acta Phys. Sin. 63 098503 (in Chinese) [刘远, 吴为敬, 李斌, 恩云飞, 王磊, 刘玉荣 2014 63 098503]
[15]	Kim S, Jeon Y, Lee J H, Ahn B D, Park S Y, Park J H, Kim J H, Park J, Kim D M, Kim D H 2010 IEEE Electron Device Lett. 31 1236
[16]	Liu Y, Wu W J, Qiang L, Wang L, En Y F, Li B 2015 Chin. Phys. Lett. 32 088506
[17]	Jun S, Bae H, Kim H, Lee J, Choi S J, Kim D H, Kim D M 2015 IEEE Electron Device Lett. 36 144
[18]	Lee S, Park H, Paine D C 2011 J. Appl. Phys. 109 063702
[19]	Bae H, Hur I, Shin J S, Yun D, Hong E, Jung K D, Park M S, Choi S, Lee W H, Uhm M, Kim D H, Kim D M 2012 IEEE Electron Device Lett. 33 534
[20]	Shin S J, Bae H, Hong E, Jang J, Yun D, Lee J, Kim D H 2012 Solid-State Electron. 72 78
[21]	Luo D, Zhao M, Xu M, Li M, Chen Z, Wang L, Peng J 2014 ACS Appl. Mater. Interfaces 6 11318
[22]	Huang C Y, Zhang L R, Zhou L, Wu W J, Yao R H, Peng J B 2015 Displays 38 93
[23]	Lee J, Jun S, Jang J, Bae H, Kim H, Chung J W, Choi S J, Kim D H, Lee J, Kim D M 2013 IEEE Electron Device Lett. 34 1521
[24]	Servati P, Nathan A 2002 IEEE Trans. Electron Devices 49 812
[25]	Jevtic M M 1995 Microelectron. Reliab. 35 455
[26]	Jayaraman R, Sodini C G 1989 IEEE Trans. Electron Devices 36 1773
[27]	Fung T C, Baek G, Kanicki J 2010 J. Appl. Phys. 108 074518
[28]	Dimitriadis C A, Brini J, Lee J I, Farmakis F V, Kamarinos 1999 J. Appl. Phys. 85 3934
[29]	Pichon L, Cretu B, Boukhenoufa A 2009 Thin Solid Films 517 6367
[30]	Bae H, Kim S, Bae M, Shin J S, Kong D, Jung H, Jang J, Lee J, Kim D H, Kim D M 2011 IEEE Electron Device Lett. 32 761
[31]	Vogel E M, Henson W K, Richter C A, Suehle J S 2000 IEEE Trans. Electron Devices 47 601

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Vol. 65, Issue 12 - 2016-06-20

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