Effect of the oligothiophene chain length on the performance of organic photovoltaic cells
Identifieur interne : 000E52 ( Main/Repository ); précédent : 000E51; suivant : 000E53Effect of the oligothiophene chain length on the performance of organic photovoltaic cells
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Abstract
We investigate photovoltaic cells based on α-oligothiophene molecules with different chain lengths nT (n = 4, 6, 8) deposited on a sandwich structure between two electrodes: ITO and Al. From the analysis of the absorption and photocurrent spectrum, we have shown that the structure of the oligothiophene affects considerably the absorbing character of the evaporated film, which is increasingly significant from 4T towards 8T, and a significant photocurrent in agreement with strong absorption in the region Al/nT. Moreover, a theoretical model of Ghosh is used to display the photocurrent origin, proved to be sufficient after adjustment with a random term. Then we deduce that the crystalline order of the film improves the transport of charge and the photocurrent. The results are confirmed by electrical characterization under illumination that shows effectively an influence of the expansion of the molecular chains on the increase in the energy efficiencies and on the performances of organic photovoltaic cells.
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A, Materials science & processing : (Print)</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Chain length</term><term>Illumination</term><term>Indium oxide</term><term>Photoconductivity</term><term>Photoelectric current</term><term>Photovoltaic cell</term><term>Sandwich structure</term><term>Tin oxide</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Longueur chaîne</term><term>Dispositif photovoltaïque</term><term>Courant photoélectrique</term><term>Photoconductivité</term><term>Eclairement</term><term>Structure sandwich</term><term>Oxyde d'étain</term><term>Oxyde d'indium</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We investigate photovoltaic cells based on α-oligothiophene molecules with different chain lengths nT (n = 4, 6, 8) deposited on a sandwich structure between two electrodes: ITO and Al. From the analysis of the absorption and photocurrent spectrum, we have shown that the structure of the oligothiophene affects considerably the absorbing character of the evaporated film, which is increasingly significant from 4T towards 8T, and a significant photocurrent in agreement with strong absorption in the region Al/nT. Moreover, a theoretical model of Ghosh is used to display the photocurrent origin, proved to be sufficient after adjustment with a random term. Then we deduce that the crystalline order of the film improves the transport of charge and the photocurrent. The results are confirmed by electrical characterization under illumination that shows effectively an influence of the expansion of the molecular chains on the increase in the energy efficiencies and on the performances of organic photovoltaic cells.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0947-8396</s0></fA01><fA03 i2="1"><s0>Appl. phys., A Mater. sci. process. : (Print)</s0></fA03><fA05><s2>110</s2></fA05><fA06><s2>1</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Effect of the oligothiophene chain length on the performance of organic photovoltaic cells</s1></fA08><fA11 i1="01" i2="1"><s1>BEDIS (Hanène)</s1></fA11><fA11 i1="02" i2="1"><s1>KOUKI (Fayçal)</s1></fA11><fA11 i1="03" i2="1"><s1>BOUCHRIHA (Habib)</s1></fA11><fA14 i1="01"><s1>Faculté des Sciences de Tunis, UMAO, Campus Universitaire, 2092 El-Manar I</s1><s2>Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></fA14><fA14 i1="02"><s1>ITODYS (UMR 7086), Université Paris Diderot (Paris 7), Bâtiment Lavoisier, 15 rue Jean de Baïf</s1><s2>75205 Paris</s2><s3>FRA</s3><sZ>3 aut.</sZ></fA14><fA20><s1>163-171</s1></fA20><fA21><s1>2013</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>16194A</s2><s5>354000505180270250</s5></fA43><fA44><s0>0000</s0><s1>© 2013 INIST-CNRS. 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