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- 저자 : Tastanbekov, Dias (검색결과 1 건)
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Ibraikulov, Olzhas A.,Bechara, Rony,Chavez, Patricia,Bulut, Ibrahim,Tastanbekov, Dias,Leclerc, Nicolas,Hebraud, Anne,Heinrich, Benoî,t,Berson, Solenn,Lemaitre, Noë,lla,Chochos, Christos L.,L& Elsevier 2015 ORGANIC ELECTRONICS Vol.23 No.-
<P><B>Abstract</B></P> <P>In this report, we explore the optoelectronic properties of a low band-gap copolymer based on the alternation of electron rich (thiophene and thienothiophene units) and electron deficient units (pyridal[2,1,3]thiadiazole (Py)). Initial density functional theory calculations point out the interest of using the Py unit to optimize the polymer frontier orbital energy levels. A high molecular weight (<I>M</I> <SUB>n</SUB> =49kg/mol) solution-processable copolymer, based on Py, thiophene and thienothiophene units, has been synthesized successfully. From cyclic-voltammetry and UV–visible absorption measurements a relatively deep HOMO level (−5.1eV) and an optical band-gap (1.48eV) have been estimated. Charge transport both in horizontal and vertical directions were extracted from field-effect transistors and space charge limited current diodes, respectively, and led to a relatively high in-plane hole mobility in pure polymer films (0.7×10<SUP>−2</SUP> cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>). GIWAXS results showed almost identical in-plane lamellar morphologies, with similar average size and orientation of the polymer crystalline domains in both, pure polymer films and polymer:fullerene blends. Also, the gate-voltage dependence of the field-effect mobility revealed that the energy disorder in the polymer domains was not altered by the introduction of fullerenes. The nevertheless significantly higher out-of-plane hole mobility in blends, in comparison to pure polymer films, was attributed to the minor amorphous polymer phase, presumably localized close to the donor/acceptor interface, whose signature was observed by UV–vis absorption. Promising photovoltaic performances could be achieved in a standard device configuration. The corresponding power conversion efficiency of 4.5% is above the value achieved previously with a comparable polymer using benzo [2,1,3]thiadiazole instead of Py as acceptor unit.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A low-band gap copolymer with pyridal[2,1,3]thiadiazole has been synthesized. </LI> <LI> Charge transport was investigated in both, in-plane and out-of plane directions. </LI> <LI> GIWAXS and mobility data reveal lamellar morphology and transport anisotropy. </LI> <LI> Amorphous polymer fraction supports out-of-plane hole mobility in blends. </LI> <LI> A maximum PCE of 4.5% could be achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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