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D-A type Quinoxaline-Based Conjugated Polymers for High Performance Polymer Solar Cells
이석우,정미진,장동욱,김주현 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Three D-A type quinoxaline-based conjugated polymers have been successfully synthesized by Stille coupling reaction, The electrondonating 2-ethylhexyloxy benzodithiophene (BDT) unit was linked to the electron-accepting di(m-hexyloxy) phenyl-substituted quinoxaline (m-HoDPQ) unit to afford the PBEh-HoQx. Furthermore, the electronaccepting m-HoDPQ unit was combined with the strong electronwithdrawing cyano-group. In addition, the combination of alkyl-thienyl substituted BDT unit yielded another target polymer. To observe the photovoltaic properties of the polymers, an inverted-type device with the configuration of ITO/ZnO/Polymer : Acceptor/MoO3/Ag was fabricated. It has been observed that the performances of OPVs were improved by the incorporation of the cyano-substituent.
이석우,정미진,장동욱,김주현 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
We have prepared organic photovoltaic cells using three quinoxalinebased conjugated polymers with triphenylamine group. The electrondonating indacenodithiophene (IDT) unit was linked to the quinoxaline which consists of two triphenylamine groups. The polymer was successfully synthesized via Stille coupling to form PIDT-Qx2TPA. Also, the fluorine atom as the electron-withdrawing substituent was systematically introduced to the chemical structure of the quinoxaline monomers to form PIDT-Qx2TPAF and PIDT-Qx2TPA2F. These all polymer devices were fabricated based on an inverted-type structure with ITO/ZnO/Polymer:PC71BM/MoO<sub>3</sub>/Ag configuration. Therefore, this study can explain the correlation with fluorine substituent in the quinoxaline structure with two strong electron-donating triphenylamine groups.
( Shinta Lieviana Handoko ),장동욱,김주현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Two new conjugated polymers (PBDT-QxCN and PBDT-QxCNCF3) have been completely synthesized. The polymers consist of Quinoxaline (Qx) as the main backbone for the electron acceptor while 2-ethyl-hexyl-thio-thiophene modified benzodithiophene (BDT) was used as the electron donating material. Introduction of strong electron-withdrawing moieties (Trifluoromethyl groups) was done to the Qx’s side chains in one of the polymers. This study clearly showed that in comparison to PBDT-QxCN, there was an improvement of PBDT-QxCNCF3's photovoltaic device performance. As a result, higher power conversion efficiency has been successfully achieved.
이석우,정미진,황동렬,김주현,장동욱 한국고분자학회 2020 Macromolecular Research Vol.28 No.13
A series of two-dimensional triphenylamine (TPA)-substituted quinoxaline- based D-A-type polymers, in which the electron-donating indacenodithiophene unit was linked to the TPA-substituted electron-accepting quinoxaline derivatives, were synthesized. Fluorine, which exhibits a strong electron-withdrawing nature, was systematically incorporated into the structure of the polymers and its effect on the properties of the polymers was investigated. Three target polymers, namely, PIQx-T0F, PIQx-T1F, and PIQx-T2F were synthesized. The Arabic numerals in the names of the polymers indicate the number of fluorine atoms at the 6,7-positions of the triphenylamine-substituted quinoxaline units in the polymers. The structural, optical, and electrochemical characteristics of the polymers were investigated. The PCE of the polymer solar cells with the inverted-type configuration based on the mono-fluorinated polymer, PIQx-T1F, was the highest (5.30%) followed by those of the devices based on PIQx-T0F (4.49%) and the di-fluorinated polymer, PIQx- T2F (4.65%). This enhanced photovoltaic performance of the device with the polymer with a single fluorine atom can be attributed to the increase in the hole mobility, charge generation and dissociation, molecular ordering, and suppression of unfavorable recombination kinetics. Therefore, the incorporation of a single fluorine atom is the optimal condition for the synthesis of TPA-substituted quinoxaline-based polymers for photovoltaic applications.
( Ratri Puspita Wardani ),정미진,장동욱,김주현 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Two D-A type conjugated polymers based on quinoxaline were successfully synthesized using the Stille coupling reaction for the polymer solar cells (PSCs) application. The electron-donating indacenodithiophene (IDT) and indacenodithieno[3,2-b]thiophene (IDTT) were attached to the electron-withdrawing quinoxaline (QxOM) containing methoxy group in the side chain to yield PIDT-QxOM and PIDTTQxOM, respectively. To examine the photovoltaic properties of the polymers, the inverted-type device with the configuration of ITO/ZnO/ Polymer:Acceptor/MoO3/Ag was fabricated. Owing to the more planar structure in IDTT than IDT, PIDTT-QxOM demonstrated the better photovoltaic performances rather than that PIDT-QxOM. Thus, this study offers the insight of the design and structure-property correlation of quinoxaline-based conjugated polymers for PSCs.
( Shinta Lieviana Handoko ),김윤환,김주현,장동욱 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Three conjugated polymers (PTBDT-Qx, PTBDT-QxCF3, and PTBDTFQxCF3) consisting of quinoxaline (Qx) as electron acceptor and 4,5-dioctylthiophen-2-yl modified benzodithiophene (BDT) as electron donor have successfully been synthesized. Different substitutions of strong electron-withdrawing moieties (fluorine atoms and trifluoromethyl groups) into multi-positions in the Qx backbone and side chains were done for each polymer. This study clearly shows an improvement in the photovoltaic device performance along with the increasing number of strong electron-withdrawing groups in the structures. As a result, an enhancement of power conversion efficiency (PCE) up to 6.47% has successfully been accomplished.