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Absorbing one-dimensional planar photonic crystal for amorphous silicon solar cell
El Daif, Ounsi,Drouard, Emmanuel,Gomard, Guillaume,Kaminski, Anne,Fave, Alain,Lemiti, Mustapha,Ahn, Sungmo,Kim, Sihan,Roca i Cabarrocas, Pere,Jeon, Heonsu,Seassal, Christian The Optical Society 2010 Optics express Vol.18 No.suppl3
<P>We report on the absorption of a 100nm thick hydrogenated amorphous silicon layer patterned as a planar photonic crystal (PPC), using laser holography and reactive ion etching. Compared to an unpatterned layer, electromagnetic simulation and optical measurements both show a 50% increase of the absorption over the 0.38-0.75micron spectral range, in the case of a one-dimensional PPC. Such absorbing photonic crystals, combined with transparent and conductive layers, may be at the basis of new photovoltaic solar cells.</P>
Madathil, Pramod Kandoth,Heinrich, Benoî,t,Donnio, Bertrand,Mathevet, Fabrice,Fave, Jean-Louis,Guillon, Daniel,Attias, Andre-Jean,Lee, Changjin,Kim, Tae-Dong,Lee, Kwang-Sup American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.10
<P>We report here the synthesis and characterization of novel diethynylbenzene-based liquid crystalline semiconductor (P1) for organic thin-film transistors (OTFTs). Compound P1 was synthesized by the Sonogashira coupling reaction between 2-bromo-5-(4-hexylthiophen-2-yl)thieno[3,2-b]thiophene and 1,4-bis(dodecyloxy)-2,5-diethynylbenzene. Top contact OTFTs were fabricated by spin casting with 2 wt% solution of P1 in chloroform and their best performance, which exhibited a hole mobility of 4.5 x 10(-5) cm2/Vs, was showed after annealing of the films at liquid crystalline temperature. Time-of-flight (TOF) mobility measured at liquid crystalline phase was observed to be 1.5 x 10(-6) cm2/Vs for both positive and negative carriers. These results indicate that the liquid crystallinity helps to improve the molecular packing and enhance charge mobility for P1. These advantages can be applicable to design and construct solution-processable OTFT materials for electronic applications.</P>
Further Education for Asian University Sports: AUSF Education and Development Centre
( Hao Cheng ),( Pei Liu ),( Jian Wang ),( Tieli Yang ),( Jun Xie ),( Bingshu Zhong ),( Qing Song ),( Cheng Fave Seetow ),( Yuetong Yan ),( Zhen Shen ),( Yanqing Xue ),( Kunning Chen ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1
Charge carrier mobility study of a mesogenic thienothiophene derivative in bulk and thin films
Mazur, L.,Castiglione, A.,Ocytko, K.,Kameche, F.,Macabies, R.,Ainsebaa, A.,Kreher, D.,Heinrich, B.,Donnio, B.,Sanaur, S.,Lacaze, E.,Fave, J.L.,Matczyszyn, K.,Samoc, M.,Wu, J.W.,Attias, A.J.,Ribierre, Elsevier Science 2014 Organic electronics Vol.15 No.4
A novel mesogenic 2,5-bis-(5-octylthiophene)-thieno[3,2b]thiophene (TT) derivative has been synthesized. The fused-ring thiophene, end-capped with two octylthiophenes, exhibits ordered lamellar mesophases which were characterized by polarizing optical microscopy, differential scanning calorimetry and small-angle X-ray diffraction at various temperatures. The charge transport properties were investigated by time-of-flight technique as a function of temperature. On cooling from isotropic phase, a maximum hole mobility value of 0.07cm<SUP>2</SUP>V<SUP>-1</SUP>s<SUP>-1</SUP> was measured in the highly ordered mesophase of the bulk films. Field-effect transistor experiments on both solution and vacuum deposited thin films have also been performed. The solution-processed films exhibit charge carrier mobilities several orders of magnitude lower than values extracted from bulk time-of-flight curves and from vacuum deposited thin film transistors. This work provides evidence that the melt-processing route is an efficient alternative to commonly used solution-processing for fabrication of charge transporting layers from liquid crystalline semiconductors, with performances comparable to evaporation techniques.