In-depth studies on rapid photochemical activation of various sol-gel metal oxide films for flexible transparent electronics

Sungjun Park, Kwang Ho Kim, Jeong Wan Jo, Sujin Sung, Kyung Tae Kim, Won June Lee, Jaekyun Kim, Hyun Jae Kim, Gi Ra Yi, Yong Hoon Kim, Myung Han Yoon, Sung Kyu Park

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155 Citations (Scopus)


Despite intensive research on photochemical activation of sol-gel metal oxide materials, the relatively long processing time and lack of deep understanding of the underlying chemical courses have limited their broader impact on diverse materials and applications such as thin-film electronics, photovoltaics, and catalysts. Here, in-depth studies on the rapid photochemical activation of diverse sol-gel oxide films using various spectroscopic and electrical investigations for the underlying physicochemical mechanism are reported. Based on the exhaustive chemical and physical analysis, it is noted that deep ultraviolet-promoted rapid film formation such as densification, polycondensation, and impurity decomposition is possible within 5 min via in situ radical-mediated reactions. Finally, the rapid fabrication of all-solution metal oxide thin-film-transistor circuitry, which exhibits stable and reliable electrical performance with a mobility of >12 cm2 V-1 s-1 and an oscillation frequency of >650 kHz in 7-stage ring oscillator even after bending at a radius of <1 mm is demonstrated. The general physicochemical mechanisms underlying photoactivated sol-gel reactions are described, with comprehensive chemical and structural analysis inducing rapid (<5 min) fabrication of various metal oxide films at low temperatures (<150 C), and all-solution processed high-performance electronic devices and circuitry on ultrathin polymeric substrates are demonstrated. This will open new possibilities to prepare future electronic materials in a fast, scalable, and economic manner.

Original languageEnglish
Pages (from-to)2807-2815
Number of pages9
JournalAdvanced Functional Materials
Issue number19
Publication statusPublished - 2015 May 1

Bibliographical note

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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