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Issue Eur. Phys. J. Appl. Phys.
Volume 48, Number 1, October 2009
Article Number 10303
Number of page(s) 6
Section Semiconductors and Devices
DOI 10.1051/epjap/2009117
Published online 08 July 2009

Eur. Phys. J. Appl. Phys. 48, 10303 (2009)
DOI: 10.1051/epjap/2009117

Low frequency noise modeling of polycrystalline silicon thin-film transistors

W. Deng1, P. Liang2 and C. Wei2

1  Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510630, P.R. China
2  South China University of Technology, Guangzhou 510640, P.R. China

dwanl@126.com

Received: 21 January 2009 / Accepted: 27 April 2009 / Published online: 8 July 2009

Abstract
A modified and improved low frequency model for polycrystalline silicon thin-film transistors (poly-Si TFTs) is developed in this paper. For small grain size poly-Si TFTs, based on carrier number fluctuations, an improvement of the standard low frequency noise model has been investigated to explain the noise characteristics of poly-Si TFTs. An exponential energy distribution for interface density of states is employed to model the interface trap capacitance. For large grain size devices, mobility fluctuations related to fluctuations of the grain boundary charges is used to describe the excess subthreshold noise. The anomalous noise increase behavior of poly-Si TFTs when operated in the kink regime is also studied and modeled. The proposed model and the experimental data agree well over a wide range of operation regimes.

PACS
71.23.An - Theories and models; localized states.
73.40.Qv - Metal-insulator-semiconductor structures.

© EDP Sciences 2009


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