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윤대희,정혜인,박용성,우제완 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
본 연구에서는 유기박막태양전지의 전자주개 물질로 적용 가능한 소재를 개발하여 광전변환 특성을 확인하고자 하였다. 고분자는 phenothiazine, benzodithiophene, quinoxaline, phthalimide, thienoisoindole, benzodithiophene을 이용하여 D/A(donor/acceptor) 반복단위 구조로 설계하였으며, 합성한 고분자를 bulk-heterojunction 구조의 소자에 활성층으로 사용하여 광전변환 특성을 확인하였다. 합성된 고분자 중 광전변환 효율이 가장 높은 고분자는 phenothiazine과 benzothiadiazole을 기반으로 한 구조이며 이 때의 PCE는 2.4% (V<sub>OC</sub>: 0.74 V, J<sub>SC</sub>: 6.9 mA/cm<sup>2</sup>, FF: 48.0%)으로 측정되었다.
A Benzodithiophene-based Semiconducting Polymer for Organic Thin Film Transistor
Hong, Jung-A,Kim, Ran,Yun, Hui-Jun,Park, Joung-Man,Shin, Sung Chul,Kim, Yun-Hi Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.4
Benzodithiophene based organic semiconducting polymer was designed and synthesized by stille coupling reaction. The structure of polymer was confirmed by NMR and IR. The weight average molecular weight ($M_w$) of polymer was 8,400 using GPC with polydispersity index of 1.4. The thermal, optical and electrochemical properties of polymer were characterized by TGA and DSC, UV-vis absorption and cyclic voltammetry. OTFT device using PBDT-10 exhibited the mobility of $7.2{\times}10^{-5}\;cm^2\;V^{-1}\;s^{-1}$ and $I_{on}/I_{off}$ of $2.41{\times}10^3$. The film morphology and crystallinity of PBDT-10, was studied using AFM and XRD.
Synthesis and Properties of Benzodithiophene-Based Donor-Acceptor Metallo-Supramolecular Polymers
Lin Liu,Fanchao Li,Chunlin Wu,Tao Tang,Xuegang Chen,Xianyi Luo,Jie Li 한국고분자학회 2019 Macromolecular Research Vol.27 No.6
Two new conjugated donor-acceptor (D-A) supramolecular building blocks, which contain benzo[1,2-b:4,5-b']dithiophene (BDT) electron-donating cores modified with alkoxy (BDT-OR) or thiophene (BDT-Th) groups and electron-accepting 2,2':6',2''-terpyridine moieties, were synthesized via Pd-catalyzed Stille coupling. Under the introduction of transition metal ion Ru2+, the novel metallo-supramolecular polymers PBDT-OR and PBDT-Th were obtained by self-assembly polymerization of the monomeric building blocks BDT-OR and BDT-Th, respectively. The resulting polymers exhibit broad absorption band from 300 to 600 nm. The embedding of the transition metal ions Ru2+ into the backbones of the supramolecular polymers increases the electron-withdrawing capacity of the terpyridine moieties. Consequently, the absorption bands of both PBDT-OR and PBDT-Th exhibit red-shift at the longer wavelength compared with the corresponding monomeric building blocks, 622 nm for PBDT-OR and 625 nm for PBDT-Th, which results from intramolecular charge transfer (ICT). The LUMO energy levels of PBDT-OR and PBDT-Th are similar, -3.44 and -3.43 eV, respectively, while their HOMO energy levels are different, -5.25 and 5.17 eV, respectively, due to distinct electron-donating abilities of the BDT cores modified with alkoxy and thiophene groups. PBDT-OR and PBDT-Th show reduced electrochemical energy gaps, 1.81 and 1.74 eV, respectively. Meanwhile, the resulting polymers PBDT-OR and PBDT-Th are thermally stable under 300 and 389 oC, respectively.
A Benzodithiophene-based Semiconducting Polymer for Organic Thin Film Transistor
홍정아,김란,Hui-Jun Yun,Joung-ManPark,신성철,김윤희 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.4
Benzodithiophene based organic semiconducting polymer was designed and synthesized by stille coupling reaction. The structure of polymer was confirmed by NMR and IR. The weight average molecular weight (Mw) of polymer was 8,400 using GPC with polydispersity index of 1.4. The thermal, optical and electrochemical properties of polymer were characterized by TGA and DSC, UV-vis absorption and cyclic voltammetry. OTFT device using PBDT-10 exhibited the mobility of 7.2 × 10−5 cm2 V−1 s−1 and Ion/Ioff of 2.41 × 103. The film morphology and crystallinity of PBDT-10, was studied using AFM and XRD.
Benzothiadiazole-benzodithiophene을 기반으로 한 D/A구조의 공액 고분자 합성 및 광전변환 효율 특성 개선 연구
성기호 ( Ki Ho Seong ),윤대희 ( Dae Hee Yun ),우제완 ( Je-wan Woo ) 한국공업화학회 2013 공업화학 Vol.24 No.5
In this study, the push-pull structure polymer for organic photo voHaics (OPVs) was synthesized and characterized. The poly{4,8-didodecyloxybenzo[1,2-b;3,4-b]dithiophene-alt-5,6-bis(octyloxy)-4,7-di(thiophen-2-yl)benzo[c][1,2,5]-thiadiazole} (PDBDT-TBTD) was synthesized by Stille coupling reaction using the benzothiadiazole (BTD) derivative as an electron acceptor and benzodithiophene (BDT) derivative as an electron donor. The structure of monomers and polymers was identified by 1H-NMR and GC-MS. The optical, physical and electrochemical properties of the conjugated polymer were identified by GPC, TGA, UV-Vis and cyclic voltammetry. The number average molecular weight (Mn) and initial decomposition temperature (5% weight loss temperature, Td) of PDBDT-TBTD were 6200 and 323 ℃, respectively. The absorption maxima on the film was about 599 nm and the optical band gap was about 1.70 eV. The structure of device was ITO/PEDOT : PSS/PDBDT-TBTD : PC71BM/BaF2/Ba/Al. PDBDT-TBTD and PC71BM were blended with the weight ratio of 1:2 which were then used as an optical active layer. The power conversion efficiency (PCE) of fabricated device was measured by solar simulator and the best PCE was 2.1%.
박광훈,김유진,하종진,단소풍,유셴칭,박성종,정대성,박찬언,권순기,김윤희 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
To evaluate the effect of side chain characteristics on the photovoltaic performance of small molecules containing both benzodithiophene (BDT) and thienopyrroledione (TPD), we designed and synthesized two such molecules, one containing a branched 2-ethylhexyl (2EH) side chain on the BDT unit (BDTEH-TTPD) and the other containing a linear n-octyl (C<sub>8</sub>) side chain on the BDT unit (BDTO-TTPD). The optical and electrochemical properties and crystalline structures of these molecules were examined. Compared to BDTO-TTPD, BDTEH-TTPD showed stronger light absorption, longer-range ordering and shorter π-π stacking distances between backbones. As a result, the power conversion efficiency of a bulk heterojunction solar cell based on BDTEH-TTPD (2.40%) was substantially higher than that of the BDTO-TTPD device (1.12%)
Agneeswari, R.,Shin, I.,Tamilavan, V.,Lee, D.Y.,Cho, S.,Jin, Y.,Park, S.H.,Hyun, M.H. Elsevier Science 2016 ORGANIC ELECTRONICS Vol.30 No.-
Property modulation of 2,5-dioctylpyrrolo[3,4-c]pyrrole-1,3(2H,5H)-dione (DPPD)-based high energy converting wide band gap polymers, P(BDT-TDPPDT) and P(BDTT-TDPPDT), was studied via the incorporation of an additional DPPD unit on their repeating units. A new electron acceptor (BDPPD) unit containing two DPPD units was prepared and copolymerized with the distannyl derivatives of benzodithiophene (BDT) or 2D-conjugated benzodithiophene (BDTT) to provide two new polymers, P(BDT-BDPPD) and P(BDTT-BDPPD). The optical band gaps and highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) energy levels of P(BDT-BDPPD) and P(BDTT-BDPPD) were 2.16 eV, 2.08 eV and -5.37 eV/@?3.21 eV, -5.44 eV/@?3.36 eV, respectively. The hole mobilities of P(BDT-BDPPD) and P(BDTT-BDPPD) were in the order of 10<SUP>-4</SUP> cm<SUP>2</SUP>V<SUP>-1</SUP> s<SUP>-1</SUP>. The polymer solar cells (PSCs) prepared with the configuration of ITO/PEDOT:PSS/P(BDT-BDPPD) or P(BDTT-BDPPD):PC<SUB>70</SUB>BM/Al gave maximum power conversion efficiencies (PCEs) of 2.74% and 3.63%, respectively. The insertion of a BDPPD unit instead of a TDPPDT unit on the DPPD-based polymer backbone did not affect the optical and electrochemical properties considerably. On the other hand, the new polymers, P(BDT-BDPPD) and P(BDTT-BDPPD), resulted in improved photovoltaic performances compared to the reported polymers, P(BDT-TDPPDT) and P(BDTT-TDPPDT), for the devices prepared without additives.
A-D-A Small Molecule Donor based on Benzodithiophene and its Application in Organic Solar Cells
( Ratna Dewi Maduwu ),김주현,진호철,( Sabrina Aufar Salma ),이준호,정미진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
An acceptor-donor-acceptor (A-D-A) small molecule donor, named (BDT-HTOX), was synthesized for the application in organic solar cells (OSCs). Benzodithiophene (BDT) was used as central donor (D) unit and phenylisoxazol (OX) as acceptor (A) unit. Hexylthiophene (HT) ring as a π-bridge to extend the effective conjugation length and increase the solubility of the material. The HUMO/LUMO energy level of BDT-HTOX were -3.72eV/-5.44 eV with an optical band gap of 1.72 eV. The devices based on BDT-HTOX/PC71BM = 1:1 in chlorobenzene as a solvent for solution processed organic solar cells showed the best performance with maximum power conversion efficiency (PCE) up to 0.80%, short-circuit current density (Jsc) of -3.26 mA/cm2, Voc of 0.88 V, and fill factor (FF) of 27.9%.
( Ratna Dewi Maduwu ),진호철,김동근,( Sabrina Aufar Salma ),김주현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
A planar acceptor-donor-acceptor (A-D-A) structured organic molecule, (BDT-HTOX), was designed and synthesized for the application as donor material in inverted type organic solar cells (OSCs). Benzodithiophene (BDT) was used as central donor (D) unit and phenylisoxazol (OX) as acceptor (A) unit, while hexylthiophene (HT) ring as a bridge to extend the effective conjugation length and increase the solubility of the material. For devices, PC71BM is employing as the electron acceptor unit. Herein, the optoelectronic properties of BDTHTOX as well as the devices performances had been investigated. UV-Vis absorption and electrochemical measurements revealed the HUMO/LUMO level at -3.72 eV/ -5.44 eV with an optical band gap of 1.72 eV for BDT-HTOX. While the devices based on BDT-HTOX : PC<sub>71</sub>BM = 1:1 in chlorobenzene as a solvent for solution processed organic solar cells showed the best performance.