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Synthesis and photovoltaic performance of homopolymer based on benzo[1,2-b:4,5-b``]dithiophene unit
고의진,성지연,한재필,문두경 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Conjugated polymers have a lot of advantages such as light weight, flexibility, large scale fabrication and etc. Donor-acceptor type conjugated polymers have been studied due to their good light harvesting and photovoltaic performance. However, the high-cost according to their complicated synthesis steps is not suited for a large scale synthesis. Also, it takes too much time to get the polymers. In this study, we synthesized a homopolymer with benzo[1,2-b:4,5-b`]dithiophene(BDT) unit by Stille coupling reaction. The homopolymer was required a few steps only for the polymerization, and was able to reduce the time to get the conjugated polymer. For the solubility, 2-ethylhexyloxy side chain was introduced to 4,8-position of BDT core. The synthesized polymer was characterized by 1H-NMR, GPC, UV-vis spectroscopy, cyclic voltammogram and etc. The fabricated device was measured.
Low band gap conjugated polymer based on isoindigo dye for organic photovoltaics
고의진,최민희,이의진,문두경 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
As far as a strong intramolecular charge transfer induced by donoracceptor( D-A) type copolymer is concerned, isoindigo as a good electron deficient unit in D-A copolymers has been widely used in polymer solar cells. It has strong electron affinity characteristic due to its two lactam rings, promising broad absorption range, high open circuit voltage according to low HOMO level, high carrier mobility due to the rigid and planar structure. In this study, thiophene was polymerized with dithienyl isoindigo with 2-octyldodecyl groups on N atoms via Stille coupling reaction. To make sure the solubility, 2-ethylhexyl groups were introduced on the thiophene units adjacent to the isoindigo. The synthesized polymer was characterized by <sup>1</sup>H-NMR, GPC, UV-vis spectroscopy and cyclic voltammogram for optical and electrochemical properties.
D-A type copolymer based on thieno[3,2-b]thiophene and isoindigo for polymer solar cells
고의진,최민희,이의진,문두경 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Polymer solar cells(PSCs) have become the focus of tremendous research due to their a lot of advantages such as low-cost, light-weight, solution process, flexibility, and so on. For a promising strategy for designing photovoltaic polymer, donor-acceptor (D-A) alternating copolymer is a good choice which can be fine-tuned by the combination of a variety of D and A building blocks and expected to achieve high performance. In this study, thieno[3,2-b]thiophene as an electron donor and isoindigo as an electron acceptor were synthesized by Stille coupling reaction. Isoindigo is one of the good acceptor units which has promising absorption property in the long wavelength region and leads to narrow band gap. The physical, optical and electrochemical properties of the synthesized polymer were characterized and the devices were fabricated and characterized photovoltaic properties.
고의진,홍영택,문두경 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Poly(vinylidene fluoride) (PVDF) is a promising material for piezoelectric nanogenerators (PNGs) due to its soft, biocompatible, lightweight, and high flexibility. For flexible electrode materials, metallic nanowires (NWs), especially silver nanowires (AgNWs), is one of best ways to be optimized. However, several disadvantages such as non-uniform network, high surface roughness, low adhesion property, and etc. are still exist even though it shows high electrical properties. In this study, a PEDOT composite (PEDOT-C6:DS) is introduced to PVDF-based PNG as an electrode material with AgNW, hybrid electrode. PNG with hybrid electrode showed higher output performance, stability and more uniform conductive network than the one with AgNW electrode. Also, it showed efficient performance as a body motion monitoring sensor.
Stretchable Piezoelectric Nanogenerators with Organic Electrodes consisting of PEDOT Derivatives
고의진,문두경 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Piezoelectric technology which converts mechanical energy to electrical energy has received attention for an alternative of power supply in low powered electronics. Poly(vinylidene fluoride)(PVDF), organic piezoelectric material, shows good piezoelectric performance, flexibility and chemical stability, However, it is strong hydrophobic, which is not good matched with common metal electrode. Conductive organic material is a good candidate to solve this problem. PEDOT:PSS, one of the best conducting polymer, is hydrophilic and acidic not good matching with PVDF. In this study, two types of PEDOT derivatives were synthesized by oxidative polymerization. The polymers had rod-like structure, and hydrophobic. The surface matching with PVDF was very good, and the piezoelectric performance were enhanced more than the one of reference with PEDOT:PSS-CNT composite.