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Raj, Michael Ruby,Kim, Yebyeol,Park, Chan Eon,An, Tae Kyu,Park, Taiho Elsevier 2019 Organic electronics Vol.65 No.-
<P><B>Abstract</B></P> <P>Compounds consisting of the electron-accepting thienoisoindigo (TIIG) moiety with branched alkyl side chains of various lengths were each copolymerized with thiophenylene vinylene thiophene (TVT) and selenophenylene vinylene selenophene (SVS) donor moieties, to investigate how the length of the side chain between the branch point and backbone affects the microstructure and charge transport of thin films made of these TIIGTVT and TIIGSVS copolymers. All of the organic field-effect devices based on these copolymers exhibited p-type behaviors, and these devices displayed hole mobility values as high as 1.15 cm<SUP>2</SUP>/V/s. Interestingly, the longer side chains in both series of TIIGTVT and TIIGSVS copolymers, the more improved was the molecular ordering of the thin films. But the relationship between charge mobility and side chain length differed for these two series of copolymers, a result attributed to differences between the microstructures of their films. The TIIGTVT series showed localized aggregation, with the greater length of the side chain between the branch point and backbone enhancing the charge transport by increasing the quantity and average size of the aggregates. In contrast, the TIIGSVS series showed long-range order, and aggregates that were too large and prevented charge transport.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We investigated the charge transport properties of six TIIG-based copolymers. </LI> <LI> All six copolymers showed sufficient charge transport for use in OFET devices. </LI> <LI> The TIIGTVT and TIIGSVS series showed different tendency of the alkyl length. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Morphological study of polymer/fullerene interfaces via benzene–<b>PC<sub>70</sub>BM</b> interaction
Raj, Michael Ruby,Kim, Hong Il,Lee, Gang-Young,Kim, Guan-Woo,Park, Taiho Elsevier 2015 ORGANIC ELECTRONICS Vol.26 No.-
<P><B>Abstract</B></P> <P>We designed and synthesized a series of highly soluble random copolymers (<B>P(BDTT-PhC8TPD-TPD)</B>) comprising a two-dimensional (2D) electron-rich 2-ethylhexylthiophene-substituted benzo[1,2-b:4,5-b′]dithiophene (<B>M1</B>) electron-rich unit and various ratios of two side chain-functionalized thieno[3,4-c]-pyrrole-4,6-diones (<B>M2</B> and <B>M3</B>) as planar electron-deficient units. The morphologies and photovoltaic performances of the bulk heterojunction blend films were examined, revealing concentration-dependent competitive benzene–benzene and benzene–fullerene interactions. A bulk heterojunction solar cell prepared using 10mol% <B>M2</B> (<B>RP1</B>) and <B>PC<SUB>70</SUB>BM</B> exhibited a power conversion efficiency (PCE) of 4.9%, representing a significant improvement over the PCE (1.1%) obtained from parent copolymer (<B>P1</B>). The PCE in these cells was strongly associated with the nanoscale morphology of the BHJ film, which depended on the higher miscibility of <B>RP1</B> with <B>PC<SUB>70</SUB>BM</B> compared to <B>RP2</B> (<B>M2</B>: 20mol%), and <B>RP3</B> (<B>M2</B>: 30mol%).</P> <P><B>Highlights</B></P> <P> <UL> <LI> The polymers (<B>RP1</B>–<B>RP3</B>) were synthesized and applied in polymer solar cells. </LI> <LI> Polymers were investigated miscibility with <B>PC<SUB>70</SUB>BM</B> through benzene–<B>PC<SUB>70</SUB>BM</B> interaction. </LI> <LI> The higher miscibility of <B>RP1</B> copolymer with <B>PC<SUB>70</SUB>BM</B>, the PCE value exceeding 4.9%. </LI> <LI> The effect on the both film morphology and PCEs were inferred by AFM. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Donor–acceptor (D–A)-based random copolymers (<B>PBDTT−PhC8TPD−TPD</B>) were synthesized and investigate the miscibility of the copolymers with <B>PC<SUB>70</SUB>BM</B> through benzene-<B>PC<SUB>70</SUB>BM</B> interaction in polymer solar cells. Due to higher miscibility and nanoscale morphology of <B>RP1</B> copolymer with <B>PC<SUB>70</SUB>BM</B> compared to <B>P1</B>, <B>RP2</B>, and <B>RP3</B> copolymer, the power conversion efficiency (PCE) exceeding 4.9%.</P> <P>[DISPLAY OMISSION]</P>
Thienoisoindigo 기반의 고분자 반도체의 대칭적인 곁가지 길이에 따른 트랜지스터 특성 변화 연구
안태규,박태호,김예별,( Michael Ruby Raj ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Thienoisoindigo 와 thiophenylene vinylene thiophene (TVT)/selenophenylene vinylene selenophene (SVS) 구조를 공중합체해서 대칭적인 곁가지의 길이를 다르게 여러 고분자를 합성하였다. 이렇게 합성한 고분자를 유기트랜지스터의 활성층으로 사용해 트랜지스터의 성능을 살펴본 결과, TVT 계열의 고분자에서는 곁가지 길이가 길어질수록 이동도가 증가되었고 SVS에서는 이동도가 감소한다는 사실을 관찰할 수 있었다. 이러한 성능 차이를 고분자의 결정구조에 기인한다는 것을 X선 산란, 시차열분석법을 통해 설명하였다.