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Synthesis and characterization of pentathiophene based copolymer for OTFT
백장열,주진욱,김란,황재영,김윤희 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
The new dialkylated pentathiophene based copolymer was synthesized by Suzuki coupling reaction. The PD5TADF is synthesized and used as an active material for organic thin film transistor (OTFTs). The copolymer has good solubility in common organic solvent such as toluene, tetrahydrofuran(THF), chloroform, chlorobenzene and dichlorobenzene. The number average molecular weight (Mn) was measured to be 148,000. The TGA curve shows that the polymers exhibit good thermal stability with a weight loss of less than 5% upon heating to 419 C with glass temperature at 184.9 C. The ultraviolet (UV) maximum of the polymer was found at 494 nm in solution and 498 nm in the film. A thin-film transistor with PD5TADF was found to exhibit typical p-channel FET characteristics with a hole mobility of 26×10<sup>-4</sup> ㎠/Vs and an on/off ratio of 304×104 with a threshold voltage of -45 V.
백장열,선진원,박정훈,안은수,김장주,김윤희 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The azasiline unit was introduced for the first time as the donor moiety to synthesize a new deep blue TADF dye, DTPDDA. The azasiline unit was separated spatially from the acceptor of triazine owing to the large dihedral angle formed at the nitrogen-carbon bridge. Replacing the carbon connection by a silicon connection widens the bandgap suitable for blue emission. An efficient blue fluorescent OLED with the CIE coordinates of (0.149, 0.197) was fabricated with an unprecedented high EQE of 22.3% and low efficiency roll-off by doping DTPDDA in a mixed cohost system of mCP:TSPO1. Theoretical prediction assuming the fraction of radiative exciton as unity agrees well with EQE indicating efficient harvest of triplets occurring in DTPDDA through RISC.
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.
Efficient DPP-based small-molecule solar cells with different electron-donating end-groups
백장열,김유진,전찬우,박찬언,김윤희 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
A series of small molecules that contained identical p-spacers (ethyne), a central diketopyrrolopyrrole (DPP) unit, and different aromatic electrondonating end-groups were synthesized and used in organic solar cells (OSCs) to study the effect of electrondonatinggroups on the device performance. The three compounds, DPP-APh, DPP-A-Na, and DPP-AAn, possessed intense absorption bands that covered a wide range, from 350 to 750 nm, and relatively low HOMO energy levels, from 5.50 to 5.55 eV. DPP-A-An, which contained anthracene end-groups, demonstrated a stronger absorbance and a higher hole mobility than DPP-A-Ph, which contained phenyl groups, and DPP-A-Na, which contained naphthalene units. The power-conversion efficiencies (PCEs) of OSCs based on organic:PC71BM blends (1:1, w/w) with a processed DIO additive were 3.93% for DPP-A-An, 3.02% for DPP-Na, and 2.26% for DPP-A-Ph. These findings suggest that a DPP core that is functionalized with electron- donating capping groups constitutes a promising new class of solution-processable small molecules for OSC applications.
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.