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( 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.
( 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.
Shinta Lieviana Handoko,진호철,황동렬,Sella Kurnia Putri,김주현,장동욱 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
Two quinoxaline-based conjugated polymers with multiple electron-withdrawing moieties weresynthesized by the Stille coupling reaction for polymer solar cells (PSCs). For the construction of a typicaldonor-p-acceptor structure, the electron-donating indacenodithiophene (IDT) and indacenodithieno[3,2-b]thiophene (IDTT) were linked to the electron-withdrawing quinoxaline (DPQCF3F) that containedtrifluoromethyl andfluorine units via a thiophene bridge to produce PIDT-Qx and PIDTT-Qx, respectively. Owing to the significant contribution of the DPQCF3F unit in the polymer backbone, Voc of the inverted-type PSCs was increased up to 0.92 V. In addition, the replacement of two thiophenes of IDT to two thieno[3,2-b] thiophene units of IDTT in the quinoxaline-based polymer backbone can efficiently improved thelight absroption and charge carrier mobility of the resultant polymer. Therefore, a higher PCE of 4.54%was achieved from the device based on PIDTT-Qx with a short circuit current density of 9.30 mA/cm2, anopen-circuit voltage of 0.92 V, and afill factor of 53%, compared with the device based on PIDT-Qx(2.83%).
Effect of cyano substituent on photovoltaic properties of quinoxaline-based polymers
Shinta Lieviana Handoko,Ho Cheol Jin,Dong Ryeol Whang,Joo Hyun Kim,Dong Wook Chang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-
Three donor-acceptor type quinoxaline-based conjugated polymers, in which electron-donatingindacenodithiophene (IDT) and indacenodithieno[3,2-b]thiophene (IDTT) were connected to theelectron-accepting 2,3-diphenylquinoxaline (DPQ) derivatives, were synthesized using the Stillecoupling reaction. To investigate the effects of the strong electron-withdrawing cyano ( CN)substituent on the photovoltaic properties of polymers, it was selectively introduced in the DPQ uniton the polymer backbone. The combination of IDT and the standard DPQ produced the referencepolymer IDT-Qx, while the coupling of IDT and IDTT with mono-CN substituted DPQ provided thetarget polymers IDT-QxCN and IDTT-QxCN, respectively. Owing to the significant contributions of theCN substituent, IDT-QxCN and IDTT-QxCN exhibited better photovoltaic performances than IDT-Qxreference. Furthermore, the presence of more planar two thieno[3,2-b] thiophenes in IDTT than thetwo thiophenes in IDT allowed IDTT-QxCN to display the highest power conversion efficiency (5.47%)with an open circuit voltage of 0.95 V, short-circuit current density of 15.30 mA cm 2, andfill factorof 56.95%.