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Wide-Spectral/Dynamic-Range Skin-Compatible Phototransistors Enabled by Floated Heterojunction Structures with Surface Functionalized SWCNTs and Amorphous Oxide Semiconductors

Abstract

Purified semiconducting single-walled carbon nanotubes (sc-SWCNT) have been researched for optoelectronic applications due to their high absorption coefficient from visible to even near-Infrared (NIR) region. Nevertheless, the insufficient electrical characteristics and incompatibility with conventional CMOS processing have limited their wide utilization in this emerging field. Here, we demonstrate highly detective and wide spectral/dynamic range phototransistors incorporating floated heterojunction active layers which are composed of low-temperature sol-gel processed n-type amorphous indium gallium zinc oxide (a-IGZO) stacked with purified p-type sc-SWCNT layer. To achieve high and broad spectral/dynamic range photo-response of the heterogeneous transistors, photochemically functionalized sc-SWCNT layers were carefully implemented onto the a-IGZO channel area with floating p-n heterojunction active layer, resulting in the suppression of parasitic charge leakage and good bias driven opto-electrical properties. The highest photosensitivity (R) of 9.6×102 A/W and photodetectivity (D*) of 4×1014 Jones along with dynamic range of 100 ~ 180 dB were achieved for our phototransistor in the spectral range of 400 ~ 780 nm including continuous and minimal frequency independent behaviors. More importantly, to demonstrate the diverse application of the ultra-flexible hybrid photosensor platform as a skin compatible electronics, the sc-SWCNT/a-IGZO phototransistors were fabricated on an ultra-thin (~1 μm) polyimide film along with severe static and dynamic electro-mechanical test. The skin-like phototransistors showed excellent mechanical stability such as sustainable good electrical performance and high photosensitivity in the wide dynamic range without any visible cracks or damages and little noise interference after rolled-up on the 150 μm-thick optical fiber as well as more than 100 cycling.

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Supplementary files

Publication details

The article was received on 03 Aug 2017, accepted on 28 Sep 2017 and first published on 10 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05729F
Citation: Nanoscale, 2017, Accepted Manuscript
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    Wide-Spectral/Dynamic-Range Skin-Compatible Phototransistors Enabled by Floated Heterojunction Structures with Surface Functionalized SWCNTs and Amorphous Oxide Semiconductors

    I. Hwang, J. H. Kim, M. Lee, M. Lee, H. Kim, H. Kwon, D. K. Hwang, M. Kim, H. Yoon, Y. Kim and S. K. Park, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05729F

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