Flexible and Transparent Organic Phototransistors on Biodegradable Cellulose Nanofibrillated Fiber Substrates

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  • Junsu Park
    Display and Nanosystem Laboratory College of Engineering Korea University Anam‐dong Seoul 02841 Republic of Korea
  • Jung‐Hun Seo
    Department of Materials Design and Innovation University at Buffalo The State University of New York Buffalo NY 14260 USA
  • Seung‐Won Yeom
    Display and Nanosystem Laboratory College of Engineering Korea University Anam‐dong Seoul 02841 Republic of Korea
  • Chunhua Yao
    Department of Material Sciences and Engineering University of Wisconsin–Madison Madison WI 53706 USA
  • Vina W. Yang
    Forest Products Laboratory USDA Forest Service Madison WI 53726 USA
  • Zhiyong Cai
    Forest Products Laboratory USDA Forest Service Madison WI 53726 USA
  • Young Min Jhon
    Sensor System Research Center Korea Institute of Science and Technology Seoul 02792 Republic of Korea
  • Byeong‐Kwon Ju
    Display and Nanosystem Laboratory College of Engineering Korea University Anam‐dong Seoul 02841 Republic of Korea

説明

<jats:title>Abstract</jats:title><jats:p>This work demonstrates flexible, transparent phototransistors that can detect visible light with nontoxic organic active materials on biodegradable substrates toward environment‐friendly electronics. The molybdenum trioxide (MoO<jats:sub>3</jats:sub>)‐buffered indium zinc oxide as high‐performance hole injector and transparent electrodes is applied for the first time to organic phototransistors on cellulose nanofibrillated fiber substrates to achieve more than 70% of transmittance in the visible range (400–750 nm) while showing high conductivity under multiple bendings. Excellent electrical switching characteristics are obtained from transistors using a pentacene active layer with a saturation mobility value of 1.40 cm<jats:sup>2</jats:sup> V<jats:sup>−1</jats:sup> s<jats:sup>−1</jats:sup>. The phototransistors, which can detect visible light and perform in two operation modes, exhibit a maximum responsivity of 54.8 A W<jats:sup>−1</jats:sup> and a photosensitivity of 24.4 under white light illumination at an intensity of 0.12 mW cm<jats:sup>−2</jats:sup>. Moreover, the devices show a stable operation during mechanical bending tests with radii ranging from 100 to 5 mm and cyclic bending tests of up to 2000 cycles at a fixed radius of 5 mm. The results suggest that these flexible phototransistors with properties of transparency and biodegradability have considerable potential for use in low‐cost and eco‐friendly disposable sensor systems.</jats:p>

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