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Long, Dang Xuan,Karakawa, Makoto,Noh, Yong-Young The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.34
<P>The high performance of soluble [60]fulleropyrrolidine upon its use as the active layer of n-channel organic field-effect transistors (OFETs) is reported. The two materials, N-phenyl derivatives C60-fused-N-phenyl-2-phenylpyrrolidine ([C60]PhNPh) and C60-fused N-phenyl-2-hexylpyrrolidine ([C60]HexNPh), have well-controlled molecular structures with a modification of the pyrrolidine ring, with no increase in the LUMO level, achieving a high mobility and highly ambient stable n-type OFET. The top-gate, bottom-contact device shows a high electron charge-carrier mobility of up to 0.14 and 0.08 cm(2) V-1 s(-1) for [C60]PhNPh and [C60]HexNPh, respectively, (I-on/I-off = 10(6)) with the commonly used CYTOP dielectric. Excess carriers introduced by a small amount of chemical doping of polyethyleneimine (PEI) compensate traps by shifting the Fermi level (E-F) toward the respective transport energy levels and therefore increase charge-carrier mobility (0.26 and 0.1 cm(2) V-1 s(-1)) and provide good ambient operational stability compared with pristine devices.</P>
Donor unit effect on DPP based organic field-effect transistor performance
Takaya, Tomotsugu,Mamo, Melaku Dereje,Karakawa, Makoto,Noh, Yong-Young Applied Science Publishers 2018 Dyes and pigments Vol.158 No.-
<P><B>Abstract</B></P> <P>We report diketopyrrolopyrrole (DPP) based copolymers, poly (diketopyrrolopyrrole-cyclopentadithiophene) (PDPPTT-CPDT) and poly(diketopyrrolopyrrolebenzo[1,2-b:4,5-b’]dithiophene) (PDPPTT-BDT) to investigate donor unit structure effects on organic field-effect transistor (OFET) performance. The highest occupied molecular orbital (HOMO) level and copolymer band gap were tuned by introducing different donor units on the acceptor DPP backbone. PDPPTT-BDT OFETs show 10 fold higher hole field-effect mobility, up to 0.08 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>, than PDPPTT-CPDT OFETs due to better crystallinity and higher HOMO energetic levels. PDPPTT-CPDT and PDPPTT-BDT were operationally stable with negligible threshold voltage shift after cycling.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two DPP based copolymers with different donor units are reported for OFET application. </LI> <LI> Introduction of different donor units tuned copolymer HOMO/LUMO levels and band gaps. </LI> <LI> Photophysical properties exhibited distinct thin film molecular interactions and crystallinities. </LI> <LI> PDPPTT-BDT exhibited stronger p-type properties with 10-fold higher hole mobility OFETs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Takaya, Tomotsugu,Mamo, Melaku Dereje,Karakawa, Makoto,Noh, Yong-Young The Royal Society of Chemistry 2018 Journal of Materials Chemistry C Vol.6 No.29
<P>We report isoindigo based copolymers, poly(isoindigo benzodifurandione-bithiophene-alkoxyl) (PIBDF-BTO) and poly(isoindigo-bithiophene-alkoxyl) (PI-BTO) for high performance organic field-effect transistors (OFETs). PIBDF-BTO was synthesized by introducing strong electron withdrawing BDF into the acceptor isoindigo unit of PI-BTO to deepen the polymer highest occupied molecular orbital and the lowest unoccupied molecular orbital. This modification provided better polymer chain crystallinity and connectivity in thin film through increased intermolecular interactions and larger co-planarity in PIBDF-BTO. X-ray diffraction and atomic force microscopy showed higher crystallinity and well-arranged nano-fibril morphological PIBDF-BTO film compared with PI-BTO film. PIBDF-BTO OFETs showed much higher field effect mobility with well-balanced ambipolar transport with hole and electron mobilities of 0.27 and 0.22 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> compared to PI-BTO OFETs with hole mobility 0.004 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> and very low electron mobility. PIBDF-BTO also showed better hole and electron injection properties due to the narrower band gap (0.97 eV) compared to PI-BTO (1.35 eV). PI-BTO and PIBDF-BTO OFETs were operationally stable with negligible threshold voltage shift after continuous cycling measurements.</P>
Kiyomi Matsuo,Tomoyuki Murata,Takanori Koga,Atsuko Kubo,Yuichi Yoshida,Yosuke Karakawa,Hiroshi Kawaguchi,Toru Tanaka,Jun Masaki,Toshikatsu Taketomi,Takeo Kitajima 한국재활복지공학회 2008 재활복지공학회논문지 Vol.2 No.1
In this paper,I will report the cases of children who are able to study at kindergarten or elementary school because they learned how to move by themselves using a moving aid before school age, and I will also discuss the development of a mobility device which allows severely disabled preschoolers to practice moving around by themselves safely and easily at home and institutions.
Matsuo, Kiyomi,Murata, Tomoyuki,Koga, Takanori,Kubo, Atsuko,Yoshida, Yuichi,Karakawa, Yosuke,Kawaguchi, Hiroshi,Tanaka, Toru,Masaki, Jun,Taketomi, Toshikatsu,Kitajima, Takeo Rehabilitation Engineering And Assistive Technolog 2008 재활복지공학회논문지 Vol.2 No.1
In this paper, I will report the cases of children who are able to study at kindergarten or elementary school because they learned how to move by themselves using a moving aid before school age, and I will also discuss the development of a mobility device which allows severely disabled preschoolers to practice moving around by themselves safely and easily at home and institutions.
Kiyorni Matsuo,Tornoyuki Murata,Takanori Koga,Atsuko Kubo,Yuichi Yoshida,Yosuke Karakawa,Hiroshi Kawaguchi,Toru Tanaka,Iun Masaki,Toshikatsu Taketomi,Takeo Kitajima 한국재활복지공학회 2009 재활복지공학회논문지 Vol.2 No.1
In this paper.I will report the cases of children who are able to study at kindergarten or elementary school because they learned how to move by themselves using a moving aid before school age, and I will also discuss the development of a mobility device which allows severely disabled preschoolers to practice moving around by themselves safely and easily at home and institutions.
Kiyomi Matsuo,Tomoyuki Murata,Takanori Koga,Atsuko Kubo,Yuichi Yoshida,Yosuke Karakawa,Hiroshi Kawaguchi,Tom Tanaka,Jun Masaki,Toshikatsu Taketorni,Takeo Kitajima 한국재활복지공학회 2008 한국재활복지공학회 학술대회논문집 Vol.2008 No.11
In this paper, I will report the cases of children who are able to study at kindergarten or elementary school because they learned how to move by themselves using a moving aid before school age, and I will also discuss the development of a mobility device which allows severely disabled preschoolers to practice moving around by themselves safely and easily at home and institutions.