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Prediction of the electrical response of solution-processed thin-film transistors using multifactorial analysis

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Abstract

Thin-film transistors (TFTs) with the active layer composed by zinc oxide (ZnO) deposited via spray-pyrolysis present several advantages such as high electrical performance, high optical transmittance in the visible spectrum, low production cost and the ability to cover large areas. Besides the traditional application in electronic/optoelectronic circuits, ZnO TFTs can also be used in sensing devices due to its responsivity to UV-light. In the present work, we performed a bi-level full multifactorial analysis of TFT performance parameters exposed to UV-light. Characterization conditions like UV-light irradiance and time after UV exposure, as well as processing parameters such as annealing temperature were varied simultaneously, allowing the application of analysis of variance (ANOVA) to investigate the effect of these factors on the electrical performance of the devices. Field-effect mobility, threshold voltage, on/off current ratio and the device intrinsic current were among the parameters used as the responses in the factorial analysis. ANOVA was used to determine the ranking of significance of each factor on the different response parameters by the evaluation of the factor effects. Moreover, the results from ANOVA permitted the construction of linear functions used to predict the device responses in the whole range of the experimental conditions, which were confirmed by independent experimental results. The influence of factor interactions and of the linearization of some response parameters was also studied to improve the accuracy of TFT response prediction.

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Acknowledgements

The authors acknowledge the financial support from São Paulo Research Foundation (FAPESP) (Grants # 2013/24461-7 and 2014/50869-6), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001 and CNPq (Grant # 573762/2008-2). We also acknowledge the technical support from the Nanostructured Soft Materials Laboratory, LNNano-CNPEM, Brazil (XPS-23205 proposal) for XPS measurements and the Nanotechnology National Laboratory for Agriculture (LNNA/EMBRAPA) supported by CNPq/SISNANO/MCTI for XRD measurements.

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Authors and Affiliations

  1. Physics Department/IBILCE, UNESP – São Paulo State University, São José Do Rio Preto, SP, 15054-000, Brazil

    João P. Braga

  2. Physics Department/IGCE, UNESP – São Paulo State University, Av. 24A, 1515, Rio Claro, SP, 13506-900, Brazil

    Lucas A. Moises, Giovani Gozzi & Lucas Fugikawa-Santos

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  1. João P. Braga
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Correspondence to Lucas Fugikawa-Santos.

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Braga, J.P., Moises, L.A., Gozzi, G. et al. Prediction of the electrical response of solution-processed thin-film transistors using multifactorial analysis. J Mater Sci: Mater Electron 30, 16939–16948 (2019). https://doi.org/10.1007/s10854-019-01695-1

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