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Evaluation of a reliable electrochromic device based on PEDOT:PSS-TiO2 heterostructure fabricated at low temperature

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Abstract

A poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)-TiO2 composite layer was fabricated using a nanoparticle deposition system (NPDS) followed by spin coating process. The charge balance and transmittance change of electrochromic (EC) devices were investigated with different electrolytes, such as LiClO4-based polymer electrolyte and ionic liquid (IL). It was found that the EC properties could be improved using 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM-TFSI) with high ionic conductivity, and a symmetric charge balance change can be obtained showing rapid switching. The PEDOT:PSS-TiO2 composite exhibited stable performance without degradation after 500 cycles, maintaining the same cyclic voltammetry (CV) curve. It seems that heterostructure of TiO2 with PEDOT:PSS showed good separation of electrons and holes, making TiO2 an efficient electron transport material with PEDOT:PSS being an efficient hole transport material. Thus, it was found that the organic-inorganic structure obtained by our simple and novel process was effective in improving EC properties due to efficient separation of electrons and holes.

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Acknowledgments

This work was supported by the Energy Efficiency & Resources Core Technology and Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resources from the Ministry of Trade, Industry & Energy, Republic of Korea (Grant No. 20142020103730 and No. 20154030200680). This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of education) (No.NPF-2016R1D1A1A02936936).

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  1. Department of Materials Engineering, Hanyang University, 5th Engineering Building, Rm. #312, 55 Hanyangdaehak-ro, Sangrok-gu, Ansan-si, Gyeonggi-do, 426-791, South Korea

    Hyungsub Kim, Kwangmin Kim, Dahyun Choi & Caroline Sunyong Lee

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  2. Kwangmin Kim
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Correspondence to Caroline Sunyong Lee.

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Kim, H., Kim, K., Choi, D. et al. Evaluation of a reliable electrochromic device based on PEDOT:PSS-TiO2 heterostructure fabricated at low temperature. Ionics 23, 2465–2474 (2017). https://doi.org/10.1007/s11581-017-2192-9

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