01805nas a2200253   4500008004100000022001400041245008800055210006900143260010600212300001400318490000700332520091900339653001101258653002101269653001301290653002701303653001301330100001901343700002001362700001701382700002101399700001801420856011301438       2007                        eng d  a0013-468600aInfluence of film structure on mobilities of charge carriers in conducting polymers0 aInfluence of film structure on mobilities of charge carriers in   aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcNOV  a8088-80950 v523 a<p>Two sorts of poly(3-hexylthiophene) (PHT) films with the same chemical compositions were prepared, and their electrochemical, spectroscopic, and transport properties were studied with a special interest in a possible influence of film structure on mobilities of charge carriers. One of the PHT films was electrochemically synthesized using 3-hexylthiophene as a monomer (as-grown film) and the other was obtained by dissolving the as-grown film in chloroform and then casting the polymer solution (cast film). A clear difference was observed in the mobility versus doping level plot between the two sorts of PHT films, demonstrating that the difference is caused only by a distinction in film structure. An initial decreasing feature of the mobility plot observed for the cast films was accounted for in terms of swelling of the films at an early stage of doping. (C) 2007 Elsevier Ltd. All rights reserved.</p>10aDoping10aelectrosynthesis10amobility10apoly(3-hexylthiophene)10aswelling1 aHarima, Yutaka1 aJiang, Xiaoqing1 aPatil, Rahul1 aKomaguchi, Kenji1 aMizota, Haruo  uhttps://library.ncl.res.in/content/influence-film-structure-mobilities-charge-carriers-conducting-polymers-001261nas a2200229   4500008004100000022001400041245009000055210006900145260007300214300001400287490000700301520046000308653001300768653002700781653001300808653001400821653002400835100002000859700001900879700001700898856011600915       2007                        eng d  a0167-577X00aTransport study on as-grown and cast films of electrogenerated poly(3-hexylthiophene)0 aTransport study on asgrown and cast films of electrogenerated po  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a4687-46890 v613 a<p>Two kinds of poly(3-hexylthiophene) films with identical chemical compositions are prepared. One of the films is obtained by electropolymerization of 3-hexylthiophene (as-grown film) and the other is prepared by casting a solution dissolving the as-grown film (cast film). A clear difference is found in the mobility vs. doping level plots between the as-grown and cast films and its reason is discussed. (c) 2007 Elsevier B.V. All rights reserved.</p>10amobility10apoly(3-hexylthiophene)10aswelling10athin film10atransport mechanism1 aJiang, Xiaoqing1 aHarima, Yutaka1 aPatil, Rahul  uhttps://library.ncl.res.in/content/transport-study-grown-and-cast-films-electrogenerated-poly3-hexylthiophene-002034nas a2200289   4500008004100000022001400041245010900055210006900164260000800233490000800241520101300249653001001262653008901272653002401361653002101385653001301406653001401419653001901433653001601452653001601468653002601484100002901510700002501539700002601564700002601590856012801616       2017                        eng d  a0021-899500aSynthesis of amphiphilic isoindigo co-polymers for organic field effect transistors: A comparative study0 aSynthesis of amphiphilic isoindigo copolymers for organic field   cNOV0 v1343 a<p><span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; background-color: rgb(248, 248, 248);">In this work, the amphiphilic isoindigo (am-iInd) based conjugated polymers namely poly(am-iInd-DT) and poly(am-iInd-TT) and their regular counterpart poly(reg-iInd-DT) and poly(reg-iInd-TT) were synthesized to compare their opto-electronic and charge transport properties. They were used to fabricate organic field effect transistors. Charge transport properties in conjugated polymers depend upon intermolecular interaction which is strongly affected by the nature of side chains. The amphiphilic nature of the conjugated polymers has little impact on the charge transport properties. The charge carrier mobility of amphiphilic conjugated polymers was comparable with the regular polymers except poly(reg-iInd-DT) which can be correlated by X-ray diffraction and thin film morphology. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45461.</span></p>10aAlkyl10aApplications; Conducting polymers; Copolymers; Optical and Photovoltaic applications10aconjugated polymers10aHigh-performance10amobility10aPackaging10aSemicondoctors10aSide-chains10aSolar-cells10aThin-film Transformer1 aDharmapurikar, Satej, S.1 aArulkashmir, Arulraj1 aMahale, Rajashree, Y.1 aChini, Mrinmoy, Kumar  uhttps://library.ncl.res.in/content/synthesis-amphiphilic-isoindigo-co-polymers-organic-field-effect-transistors-comparative02151nas a2200229   4500008004100000022001400041245009400055210006900149260000800218300001600226490000700242520140100249653001101650653001301661653001601674653001501690653002401705100002201729700002701751700001901778856012401797       2019                        eng d  a1944-824400aThiol and halometallate, mutually passivated quantum dot ink for photovoltaic application0 aThiol and halometallate mutually passivated quantum dot ink for   cJUL  a26100-261080 v113 a<p>Tunable-band-gap colloidal QDs are a potential building block to harvest the wide-energy solar spectrum. The solution-phase surface passivation with lead halide-based halometallate ligands has remarkably simplified the processing of quantum dots (QDs) and enabled the proficient use of materials for the development of solar cells. It is, however, shown that the hallometalate ligand passivated QD ink allows the formation of thick crystalline shell layer, which limits the carrier transport of the QD solids. Organic thiols have long been used to develop QD solar cells using the solid-state ligand exchange approach. However, their use is limited in solution-phase passivation due to poor dispersity of thiol-treated QDs in common solvents. In this report, a joint passivation strategy using thiol and halometallate ligand is developed to prepare the QD ink. The mutually passivated QDs show a 50% reduction in shell thickness, reduced trap density, and improved monodispersity in their solid films. These improvements lead to a 4 times increase in carrier mobility and doubling of the diffusion length, which enable the carrier extraction from a much thicker absorbing layer. The photovoltaic devices show a high efficiency of 10.3% and reduced hysteresis effect. The improvement in surface passivation leads to reduced oxygen doping and improved ambient stability of the solar cells.</p>
10aligand10amobility10aquantum dot10asolar cell10asurface passivation1 aMandal, Debranjan1 aGoswami, Prasenjit, N.1 aRath, Arup, K.  uhttps://library.ncl.res.in/content/thiol-and-halometallate-mutually-passivated-quantum-dot-ink-photovoltaic-application01764nas a2200229   4500008004100000022001400041245010300055210006900158260000900227300001600236490000700252520100500259653001101264653001301275653001601288653001501304653002401319100002201343700001901365700001901384856013101403       2021                        eng d  a1944-824400aReduction of hydroxyl traps and improved coupling for efficient and stable quantum dot solar cells0 aReduction of hydroxyl traps and improved coupling for efficient   cOCT   a46549-465570 v133 aProgress in quantum dot (QD)-based solar cells has been underpinned by the improvements in surface passivation and advancements in device engineering. Acute control over the surface properties is crucial to restrict the formation of in-gap trap states and improve the QD coupling in achieving conducting QD films. In this report, we demonstrate a solution-phase hybrid passivation strategy, which is beneficial in removing detrimental hydroxyl traps and improving the coupling between QDs by reducing the interdot distance. Advancement in surface passivation is translated to the long carrier lifetime, higher carrier mobility, and superior protection toward degradations in QD solids. The performance of solar cell devices is increased by 26% to reach an efficiency of 10.6%, compared to the state-of-the-art lead halide passivated solar cells. The improvement in solar cell performance is supported by the reduction of trap states and an 80 nm increase in thickness of the light-absorbing QD layer.10aligand10amobility10aquantum dot10asolar cell10asurface passivation1 aMandal, Debranjan1 aDambhare, Neha1 aRath, Arup, K.  uhttps://library.ncl.res.in/content/reduction-hydroxyl-traps-and-improved-coupling-efficient-and-stable-quantum-dot-solar-cells01567nas a2200265   4500008004100000022001400041245012800055210006900183260000800252300001100260490000800271520066400279653003100943653001400974653001300988653000901001653002001010100002901030700002701059700001801086700002401104700002101128700002601149856012601175       2021                        eng d  a0009-261400aSignificance of secondary forces toward improving the charge carrier mobility of Isoindigo based conjugated small molecules0 aSignificance of secondary forces toward improving the charge car  cJUL  a1386210 v7743 a<p>The charge carrier mobility of conjugated small molecules (CSMs) depends on the intermolecular interactions and morphology. Herein, we report the synthesis of CSMs having different side chains. Hydrogen bonding, lipophilic imbalance and van der Waals interactions are imparted through the asymmetric substitution of Isoindigo. The secondary forces impact thin film morphology, and charge carrier mobility. The CSMs having van der Waals interaction further shows higher charge carrier mobility as a function of improved morphology, and increased temperature. The highest mobility of 0.15 cm2/Vs has been achieved for CSMs with van der Waals interaction.</p>10aConjugated small molecules10aIsoindigo10amobility10aOFET10aSecondary force1 aDharmapurikar, Satej, S.1 aKashmir, Arulraj, Arul1 aKumari, Tanya1 aKalalawe, Virbhadra1 aKanetkar, Maruti1 aChini, Mrinmoy, Kumar  uhttps://library.ncl.res.in/content/significance-secondary-forces-toward-improving-charge-carrier-mobility-isoindigo-based