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도영주,박형진,Thavamani Gokulnath,성경민,박호열,진성호 한국고분자학회 2022 Macromolecular Research Vol.30 No.3
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 been rarely reported. In this regard, we systematically explored a π-conjugated WBG polymer with a distinct side-chain of siloxane functionality for high performance all-PSCs. We found that the π-conjugated WBG polymer (Si-BDT) has good absorption spectra with polymer acceptor (P(NDI2OD-T2)), high charge carrier mobility and enhanced bulk-heterojunction morphology. When the polymer with siloxane functionalized side-chain had power conversion efficiency (PCE) of 7.54% with significantly enhanced photocurrent and fill factor. Notably, the additive-free Si-BDT:P(NDI2OD-T2) exhibits stable characteristics. These results demonstrate that siloxane functionalized side chains are a promising strategy to design new π-conjugated polymers toward the stable all-PSCs.
Rajalapati Durga Gayathri,Thavamani Gokulnath,박호열,Zhiqing Xie,진성호,한승철,이재욱 한국고분자학회 2022 Macromolecular Research Vol.30 No.10
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 current work, we designed two fluorine-dithiophene (FDT)-based small molecule HTMs (F2DT and FDT-DMP), and comparative studies of HTMs were performed for stable donor-acceptor-donor (D-A-D) perovskite solar cells. Notably, the introduction of fluorene-terminated groups on FDT resulted in fine-tuned energy levels and better thermal stability with a high glass transition temperature (T g~157℃), which follow-on enhanced perovskite device performance of F2DT. The hydrophobic nature of the F2DT compound truly favored the formation of uniform and dense perovskite films that further improved the stability of the devices. The comparison studies revealed that F2DT displayed higher power conversion efficiency (PCE) of 18% than FDT-DMP (PCE of 12.3%). The resultant F2DT device displays better stability than the device with FDT-DMP, maintaining almost 80% of its initial performance for more than 300 h.
김정현,박정현,송동현,지제성,Thavamani Gokulnath,한승철,진성호,이재욱 한국고분자학회 2023 Macromolecular Research Vol.31 No.5
The new polymer, poly[1-(5-(4,8-bis(4-chloro-5-(2-ethylhexyl)thiophen-2-yl)-6-methylbenzo[1,2-b:4,5-b′]dithiophen-2-yl)-4-fluorothiophen-2-yl)-5,7-bis(2-ethylhexyl)-3-(4-fluoro-5-methylthiophen-2-yl)benzo[1,2-c:4,5-c′]dithiophene-4,8-dione] comprising PFBDB–TCl–(EH) was designed and synthesized for fabrication of non-fullerene organic solar cells application. The PFBDB–TCl–(EH) was synthesized by Stille polymerization. PFBDB–TCl–(EH) blended with IT-4F and Y7 exhibited an efficiency of 5.03% and 9.10%. By contrast, PFBDB–TCl–(EH):SiCl–BDT:Y7-based ternary device exhibited best efficiency of 15.10%, open-circuit voltage (Voc) of 0.83 V, a short-circuit current density (Jsc) of 27.68 mA/cm2, and fill factor (FF) of 65.25%, respectively. This results indicated the PFBDB–TCl–(EH) exhibited excellent compatibility with the host blend SiCl–BDT:Y7 and tended to enhance miscibility and formed cascade energy levels.
A New Benzodithiophene Based Donor-Acceptor π-Conjugated Polymer for Organic Solar Cells
Saripally Sudhaker Reddy,Um Kanta Aryal,진현정,Thavamani Gokulnath,Durga Gayathri Rajalapati,Kakaraparthi Kranthiraja,신성태,진성호 한국고분자학회 2020 Macromolecular Research Vol.28 No.2
A new benzodithiophene based donor-acceptor π-conjugated polymer (P1) is designed and explored as the photoactive donor for organic solar cells (OSCs). The synthesized donor polymer, P1 displays a wide absorption profile ranging from 300-750 nm with optical band gap of 1.61 eV and moderate ionization potential of -5.30 eV. It has good solubility in non-halogenated and halogenated organic solvents. Next, we fabricated OSCs with P1 by blending with PC71BM, the pristine polymer processed from chlorobenzene showed PCE of 2.79%. Upon addition of external additive diphenyl ether to the blend showed a dramatic improvement in PCE with maximum of 5.33%. DPE tailored the active layer morphology and showed two times higher PCE than pristine films. These results clearly indicate that the new polymer has a great potentiality for enhancing efficiency upon solvent additives, which will provide new routes for the development of new class of polymers for high-performance air-stable OSCs.
Kakaraparthi Kranthiraja,김혜린,이지은,Um Kanta Aryal,Saripally Sudhaker Reddy,Rajalapati Durga Gayathri,Thavamani Gokulnath,진성호 한국고분자학회 2023 Macromolecular Research Vol.31 No.9
We report a series of π-conjugated polymers (P1-F, P2-Cl, and P3-OMe) with three different functional groups (fluorine, chlorine, and methoxy) on their conjugated side chains. Although all three polymers showed identical photophysical properties by varying the functional group, they showed a notable difference in their dipole moment difference between the ground and excited state (Δµge) values. Furthermore, photovoltaic properties of fullerene organic solar cells (FOSCs)/non-fullerene organic solar cells (NFOSCs) were significantly affected concerning the functional group in the π-conjugated polymer. Interestingly, halogen-substituted polymers (P1-F and P2-Cl) showed an enhanced PCE than methoxy-substituted polymer (P3-OMe) in both NFOSCs and FOSCs. Also, the FOSCs were much affected upon functional group modulation than did in NFOSCs. The difference in the photovoltaic properties of P1-F, P2-Cl and P3-OMe based OSCs was further analyzed by atomic force microscopy, space charge limited current method, water contact angle and transient photoluminescence measurements. Overall, our work sheds light on the importance of side chain functional group modulation of donor polymers for efficient F and NFOSCs.