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Um, Hyun Ah,Lee, Dae Hee,Heo, Dong Uk,Yang, Da Seul,Shin, Jicheol,Baik, Hionsuck,Cho, Min Ju,Choi, Dong Hoon American Chemical Society 2015 ACS NANO Vol.9 No.5
<P>We synthesized a highly crystalline DPP-based polymer, DPPBTSPE, which contained 1,2-bis(5-(thiophen-2-yl)selenophen-2-yl)ethene as a planar and rigid electron donating group. High- and low-molecular weight (MW) DPPBTSPE fractions were collected by Soxhlet extraction and were employed to investigate their unique charge transport properties in macroscopic films and single crystalline polymer nanowire (SC-PNW), respectively. The low-MW polymer could provide well-isolated and high aspect ratio SC-PNWs, in which the direction of π–π stacking was perpendicular to the wire growing axis. The field effect transistors made of SC-PNWs exhibited remarkably high carrier mobility of 24 cm<SUP>2</SUP> V<SUP>–1</SUP> s<SUP>–1</SUP>. In addition, phototransistors (PTs) made of SC-PNW showed very high performance in terms of photoresponsivity (<I>R</I>) and photoswitching ratio (<I>P</I>). The average <I>R</I> of the SC PNW-based PTs were in the range of 160–170 A W<SUP>–1</SUP> and the maximum <I>R</I> was measured at 1920 A W<SUP>–1</SUP>, which is almost three orders higher than that of thin film-based PT device.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-5/acsnano.5b01982/production/images/medium/nn-2015-01982f_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b01982'>ACS Electronic Supporting Info</A></P>
Kim, Jae Yoon,Yang, Da Seul,Shin, Jicheol,Bilby, David,Chung, Kyeongwoon,Um, Hyun Ah,Chun, Jaehee,Pyo, Seungmoon,Cho, Min Ju,Kim, Jinsang,Choi, Dong Hoon American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.24
<P>Diketopyrrolopyrrole (DPP)-based conjugated polymer <B>PDTDPPQT</B> was synthesized and was used to perform epitaxial polymer crystal growth on removable 1,3,5-trichlorobenzene crystallite templates. A thin-film transistor (TFT) was successfully fabricated in well-grown large spherulites of <B>PDTDPPQT</B>. The charge carrier mobility along the radial direction of the spherulites was measured to be 5.46–12.04 cm<SUP>2</SUP> V<SUP>–1</SUP> s<SUP>–1</SUP>, which is significantly higher than that in the direction perpendicular to the radial direction. The dynamic response of charge transport was also investigated by applying a pulsed bias to TFTs loaded with a resistor (∼20 MΩ). The charge-transport behaviors along the radial direction and perpendicular to the radial direction were investigated by static and dynamic experiments through a resistor-loaded (RL) inverter. The RL inverter made of <B>PDTDPPQT</B>-based TFT operates well, maintaining a fairly high switching voltage ratio (<I>V</I><SUB>out</SUB><SUP>ON</SUP>/<I>V</I><SUB>out</SUB><SUP>OFF</SUP>) at a relatively high frequency when the source-drain electrodes are aligned parallel to the radial direction.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-24/acsami.5b02265/production/images/medium/am-2015-02265y_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b02265'>ACS Electronic Supporting Info</A></P>
Kaur, Matinder,Lee, Dae Hee,Yang, Da Seul,Um, Hyun Ah,Cho, Min Ju,Kang, Ju Sik,Choi, Dong Hoon The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.92
<P>A new bitellurophene-based π-conjugated polymer (<B>PDPPBTe</B>) was synthesized and its semiconducting property was utilized for detecting Br<SUB>2</SUB>. The <B>PDPPBTe</B> polymer exhibited a highly sensitive response to Br<SUB>2</SUB>, which was indicated by a significant variation of the drain current in thin-film transistors.</P> <P>Graphic Abstract</P><P>A new DPP-bitellurophene conjugated polymer (<B>PDPPBTe</B>) was synthesized <I>via</I> Suzuki coupling. TFT devices made of <B>PDPPBTe</B> were used for the detection of Br<SUB>2</SUB> by monitoring the variation in the drain current. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc06531j'> </P>