02088nas a2200229   4500008004100000022001400041245017400055210006900229260011000298300001600408490000600424520111500430100001601545700002801561700001801589700003001607700002401637700002101661700002301682700002101705856013201726       2015                        eng d  a2046-206900aDetailed study on the thermal, photo-physical and electrochemical properties and OFET applications of D-pi-A-pi-D structured unsymmetrical diketopyrrolopyrrole materials0 aDetailed study on the thermal photophysical and electrochemical   aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcOCT  a94859-948650 v53 a<p>A series of seven unsymmetrical diketopyrrolopyrrole (DPP) derivatives with donor-pi-acceptor-pi-donor (D-pi-A-pi-D) architecture have been designed, synthesized and well characterised. The effect of the electron donating capacity and extent of electronic conjugation of the end-capping units on the thermal, photo-physical and electrochemical properties of the synthesized materials was thoroughly investigated using various experimental techniques and theoretical calculations. Organic field-effect transistors (OFETs) were fabricated using these materials to obtain their hole/electron transporting characteristics. All these materials showed moderate to good hole transporting ability, and the OFET fabricated using the DPP-derivative with benzofuran and pyrene end groups exhibited a hole mobility of 6.7 x 10(-4) cm(2) V-1 s(-1) with VT of similar to 9 V. The observed photo-physical, electrochemical, thermal, and charge carrier properties of the synthesized DPP-derivatives indicated their applicability in various areas like organic photovoltaics, disposable electronics and biomedical devices.</p>1 aBharath, D.1 aChithiravel, Sundaresan1 aSasikumar, M.1 aChereddy, Narendra, Reddy1 aShanigaram, Balaiah1 aBhanuprakash, K.1 aKrishnamoorthy, K.1 aRao, Jayathirtha  uhttps://library.ncl.res.in/content/detailed-study-thermal-photo-physical-and-electrochemical-properties-and-ofet-applications-001989nas a2200229   4500008004100000245012500041210006900166260000800235300001200243490000800255520117600263100001801439700001601457700001601473700003001489700002001519700002301539700002401562700002101586700002101607856013101628       2016                        eng d00aRole of acceptor strength on OFET properties of small molecular organic semiconducting materials with D-A-D architecture0 aRole of acceptor strength on OFET properties of small molecular   cOCT  a236-2460 v2203 aTwo organic semiconducting materials 2,5-didodecyl-3,6-bis(4-(11-dodecyl-11H-benzo[a]carbazol-8yl)phenyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione. (BCDPP) and 1,5-didodecyl-3,7-bis(4-(11-dodecyl-11H-benzo[a]carbazol-8-yl)phenyl)dipyrrolo[3,2-b:3',2'-e]pyrazine-2,6(1H,5H)-dione (BCPzDP) with D-A-D architecture have been designed, synthesized and well characterized. Both the materials have benzocarbazole donor end-capping units. While BCDPP contains well explored diketopyrrolopyrrole (DPP), BCPzDP possesses electron deficient dipyrrolopyrazinedione (PzDP) as acceptor moiety. The importance of the nature of acceptor moiety in tuning the charge transport properties of the synthesized materials is explored. Thermal, photo-physical and electrochemical properties of these materials are measured and solution processed OFETs are fabricated. OFETs with BCDPP show unipolar p-type semiconducting properties with hole mobility of 1.02 x 10(-4) cm(2) V-1 s(-1) and OFETs of BCPzDP exhibit ambipolar charge transport behaviour with optimal saturation hole and electron mobilities of 0.0054 and 0.0013 cm(2) V-1 s(-1), respectively. (C) 2016 Elsevier B.V. All rights reserved.1 aSasikumar, M.1 aBharath, D.1 aKumar, Siva1 aChereddy, Narendra, Reddy1 aChithiravel, S.1 aKrishnamoorthy, K.1 aShanigaram, Balaiah1 aBhanuprakash, K.1 aRao, Jayathirtha  uhttps://library.ncl.res.in/content/role-acceptor-strength-ofet-properties-small-molecular-organic-semiconducting-materials-d-d