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Structural tuning of quinoxaline-benzodithiophene copolymers via alkyl side chain manipulation: synthesis, characterization and photovoltaic properties

M. Tessarolo ; Desta Antenehe Gedefaw (Institutionen för kemi- och bioteknik, Polymerteknologi) ; M. Bolognesi ; F. Liscio ; Patrik Henriksson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Wenliu Zhuang (Institutionen för kemi- och bioteknik, Polymerteknologi) ; S. Milita ; M. Muccini ; Ergang Wang (Institutionen för kemi- och bioteknik, Polymerteknologi) ; M. Seri ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi)
Journal of Materials Chemistry A (2050-7488). Vol. 2 (2014), 29, p. 11162-11170.
[Artikel, refereegranskad vetenskaplig]

We report here the synthesis and characterization of two novel semiconducting quinoxaline (FQ)-benzodithiophene (BDT) based copolymers, PFQBDT-TR1 and PFQBDT-T2R(2), in which the BDT unit is substituted with either 2-octylthienyl (-TR1) or 2,3-dihexylthienyl (-T2R(2)), respectively, as side groups. The effect of the alkyl side chain(s), linked to the thienyl side groups, on the optical, electronic and morphological properties of the resulting polymers is investigated and correlated with the photovoltaic performance. Solution-processed BHJ solar cells, using these copolymers as electron donor materials and PC61BM (or PC71BM) as an electron acceptor counterpart, are prepared by a blade-coating technique under ambient conditions. As a result, power conversion efficiencies (PCEs) of similar to 5.7% and similar to 3.4% have been achieved for PFQBDT-TR1 and PFQBDT-T2R(2) based devices, respectively, highlighting the crucial role of the alkyl portion of the pi-conjugated side segment in the optoelectronic properties of this class of copolymers.



Denna post skapades 2014-08-22. Senast ändrad 2014-09-02.
CPL Pubid: 201830

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)

Ämnesområden

Polymerteknologi

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


SUstainable Novel FLexible Organic Watts Efficiently Reliable (SUNFLOWER) (EC/FP7/287594)