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  1. Article

    Open Access

    Copper laser patterning on a flexible substrate using a cost-effective 3D printer

    We studied the cost effective direct laser patterning of copper (Cu) on thin polyimide substrates (PI thickness: 12.5–50 µm) using a 405 nm laser module attached to an inexpensive 3D printer. The focal length ...

    Sajal Chakraborty, Ho-Yeol Park, Sung Il Ahn in Scientific Reports (2022)

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    Article

    Facile and Stable Fluorene Based Organic Hole Transporting Materials for Efficient Perovskite Solar Cells

    Although the small molecule hole-transporting materials (HTMs) pop up with an efficiency of over 25%, long-term stability still needs to be improved for the commercialization of perovskite solar cells. In the ...

    Rajalapati Durga Gayathri, Thavamani Gokulnath, Ho-Yeol Park… in Macromolecular Research (2022)

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    Article

    Significance of Siloxane Functionalized Side-Chain π-Conjugated Polymer Donor: Optimization of Active Layer Morphology Toward the Stable All-Polymer Solar Cells

    Side-chain properties of π-conjugated wide bandgap (WBG) polymers have been widely studied for application in all-polymer solar cells (all-PSCs), but the siloxane functionalized side-chains based polymers has bee...

    Yeongju Do, Hyung** Park, Thavamani Gokulnath, Kyungmin Sung… in Macromolecular Research (2022)

  4. No Access

    Article

    Introducing an Organic Hole Transporting Material as a Bilayer to Improve the Efficiency and Stability of Perovskite Solar Cells

    Although perovskite solar cells (PSCs) have achieved high power conversion efficiency (PCE) by utilizing 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamine)-9,9′-Spirobifluorene (Spiro-OMeTAD) as hole transporting m...

    Veera Murugan Arivunithi, Ho-Yeol Park, Saripally Sudhaker Reddy… in Macromolecular Research (2021)

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    Article

    New 2D-Conjugated Polymer for Non-Halogenated and Halogenated Solvents Processed Organic Solar Cells

    Um Kanta Aryal, Ho-Yeol Park, Woosum Cho, Sung-Ho **… in Macromolecular Research (2018)

  6. No Access

    Article

    Impact of Topology of Alkoxy Side Chain in Alkoxyphenylthiophene Subsituted Benzodithiophene Based 2D Conjugated Low Bandgap Polymers on Photophysical and Photovoltaic Properties

    We report a new series of low band gap (LBG) polymers (P1-P4), in which para or meta- alkoxyphenylthiophene (APTh) substituted benzodithiophene and 2,5-ethylhexyl-3,6-bis(5-bromothiophen-2-yl)pyrrolo[3,4-c]-pyrro...

    Kakaraparthi Kranthiraja, Ho-Yeol Park, Kumarasamy Gunasekar… in Macromolecular Research (2018)