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조철성,김명종,박성종,이상봉,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In this study, we designed dialkoxyanthracene as donor units. The anthracene is fused and planar aromatic with rich electrons that induced efficient intermolecular π- π interaction, resulting in good charge mobility. Furthermore, the introduction of dialkoxy group on the 9,10-position of anthracene can increase solubility as well as electron density due to the dialkoxy side chains. Replacement of alkoxynaphthalene with alkoxyanthracene is a promising strategy to increase the diversity of modification of the molecule and electronic structures, which can lead to the development of good organic semiconducting material due to the extended p-conjugation. Here, we report on the synthesis and characterization of new copolymers, that are composed of dialkoxyanthracene as donor and benzothiadiazole as acceptor (ODA-BT), and dialkoxyanthracene as donor and thiophene benzothiadiazole thiophene as acceptor (ODA-TBT) for organic photovoltaic cells.
조철성,천예림,하종진,하연희,마재열,김유진,박찬언,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A-D-A conjugated polymer, PTPD-TVT, containing thienopyrroledione and thiophene-vinylene-thiophene (TVT) units was synthesized as an electron donor for organic photovoltaic devices. It possesses a small bandgap and has excellent coplanarity and high hole mobility. To further enhance the interchain interactions between the polymer chains, a selenophene-vinylene-selenophene (SVS) unit was also introduced and copolymerized to form the PTPD-SVS polymer. Devices made from PTPD-TVT and PTPD-SVS have rather promising power conversion efficiencies (PCEs) of 4.87 and 5.74%, respectively. The higher PCE value for solar cells based on PTPD-SVS was attributed to an enhanced carrier mobility resulting from stronger interchain aggregation in the BHJ active layer. These results show that the incorporation of a vinylene unit in TPD-based polymers is an effective way to reduce the bandgap and thereby improve charge transport for efficient photovoltaic devices.
Molecular ordering effect of a new small molecules for blue fluorescence OLEDs
김명종,조철성,손선영,정성준,이상봉,신태주,이한구,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Organic light emitting diodes (OLEDs) have potential applications in next-generation electronics because of their advantages, including low driving voltage, wide view-angle, lightweight, and flexible large-area display and lighting. To improve device efficiency, syntheses with functional organic materials are required because high efficient charge injection and transport into OLEDs are the limiting factors in determining operating voltage and device efficiency. Although molecular orientation in organic photovoltaics (OPVs) and organic field-effect transistors (OFETs) have been investigated using grazing incidence X-ray diffraction (GIXD) analysis, the molecular orientation of the emitting material in OLEDs is still not unclear. Herein we focused on determining the molecular orientation change according to substituent position of core unit.
백장열,조철성,김명종,( Xianqing Liu ),박광훈,김유진,박찬언,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A solution-processed alkylselenophene-substituted benzodithiophene (BDT) small molecule, namely, BDTSe-TTPD, with broad absorption and suitable energy levels was synthesized. The widely used solvents o-dichlorobenzene (o-DCB), chlorobenzene (CB) or chloroform (CF) were used as the spin-coating solvent, to fabricate efficient photovoltaic devices with BDTSe-TTPD as the donor material and PC<sub>71</sub>BM as the acceptor. Devices made from a CF solution demonstrated better performance in terms of short-circuit current, fill factor and power conversion efficiency, as compared to the devices made from the o-DCB and CB solutions. Finally, by optimizing the thickness of the active layer, a power conversion efficiency of 4.37% was achieved on devices with an area of 0.09 cm<sup>2</sup>, under 100 mW cm<sup>2</sup> of simulated AM 1.5 irradiation.
박광훈,조철성,황문찬,김형남,강홍규,유길호,이광희,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
We have used Stille coupling polymerization to synthesize new crystalline deep HOMO level polymers, PhBDT-BT and PhBDT-DTBT, which consist of 4,8-bis(2-octyldodecyloxyphenyl)-benzo-[1,2-b:4,5-b’] dithiophene (PhBDT) as an effective electron donor unit and 4,7-dibromobenzo [c] thiadiazole (BT), or 4,7-bis(5-bromothiophen-2-yl)benzo [c] thiadiazole (DTBT)units as electron acceptor units. Photovoltaic devices fabricated from the PhBDT-DTBT/PC<sub>70</sub>BM (1:2) blend system exhibited an excellent photovoltaic (PV) performance with a V<sub>oc</sub> value of 0.73 V, a short-circuit current density (J<sub>sc</sub>) value of 7.06 mA/cm<sup>2</sup>, a fill factor (FF) value of 0.67, and a promising power conversion efficiency (PCE) of 3.5%. In addition, organic thin film transistor (OTFT) devices using PhBDT-DTBT as the semiconductor also showed excellent performance with a value of hole mobility of 4.7 x -10<sup>-2</sup> cm<sup>2</sup> V<sup>-1</sup>s<sup>-1</sup>. In the PhBDT-DTBT, the thiophene bridge between the PhBDT and benzothiadiazole provides enough space for the interdigitation of the bulky alkoxyphenyl side chains, increasing the planarity with enhanced π-π stacking.
Alkyl chain length dependence of the device properties containing new anthracene derivatives
백장열,김윤희,조철성,박광훈,박성종,안은수 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
We report six asymmetric alkylated anthracenebased molecules with different alkyl side chain lengths for use in organic field-effect transistors (OFETs). Alkyl side chains can potentially improve the solubility and processability of anthracene derivatives. The crystallinity and charge mobility of the anthracene derivatives may be improved by optimizing the side chain length. The moderate side chain length appeared to be optimal for promoting selforganization among asymmetric anthracene derivatives in OFETs, and was certainly better than the short or long alkyl side chain lengths, as confirmed by X-ray diffraction measurements.
윤희준,이기백,조철성,송형근,백장열,안은수,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Solution-processed small molecule solar cells (SMSCs) have the advantages over PSCs of high purity as well as well-defined structure and molecular weight without batch-to-batch variation, and so have received more and more attention. In order to improve SMSC performance and take full advantage of the properties of small molecules, further systematic research is required. In particular, improvements in active materials, especially in the donor materials, are vital to the production of high PCE SMSCs. In this study, a new push-pull organic semiconductor, Material designed and synthesized by lithiation, Suzuki coupling reaction. The structure of obtained material was confirmed by NMR, FT-IR and mass spectrometry (MS), and the physical properties were characterized by UV-vis spectroscopy, CV, DSC, and TGA. This material exhibits superior intramolecular charge transfer from the functionalized EW group, which produces an ED group that facilitates electron transfer into the active layer constituent PC71BM in a solar cell.
Synthesis and characterization of quinquethiophene end capped anthracene for solution processed OFET
윤희준,하종진,조철성,송형근,백장열,안은수,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The new organic semiconductor which is composed of antracene core unit and dihexylquinquethiophene on both sides, ANT5 was synthesized by bromination, Grignard reaction and Suzuki coupling reaction. The structure of obtained material was confirmed by NMR, FT-IR and mass spectrometry (MS), and the physical properties were characterized by UV-vis spectroscopy, cyclovoltammetry (CV), differencial scanning calorimetry (DSC), and thermogravimetric analysis (TGA). ANT5 showed good solubility in common organic solvent such as chloroform and toluene, which could fabricate OTFTs device as solution process. It exhibits field effect performances - the mobility, on/off ratio, and VTH of the ANT5 were 6 × 10<sup>-4</sup> cm<sup>2</sup>/(V s), 1.44 × 10<sup>4</sup>, and -1.9 V, respectively.
안은수,김권현,박성종,조철성,하연희,김윤희 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In this study, we investigated the effect of main ligands of heteroleptic Ir complexes (HICs) on the emitting dipole orientation (EDO) in doped fi lms and related the EDO to the angle between the transition dipole moments (TDM) of emission dipoles and the C2 axis of the molecules. For this purpose, we designed and synthesized four iridium complexes where the hydrogen atom(s) at different positions of the cyclometalated ligands of Ir(ppy)2 tmd were systematically replaced by methyl group(s) keeping the ancillary ligand the same as tmd.