Structural tuning of quinoxaline-benzodithiophene copolymers via alkyl side chain manipulation: synthesis, characterization and photovoltaic properties
Artikel i vetenskaplig tidskrift, 2014

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.

Författare

Marta Tessarolo

Istituto Per Lo Studio Dei Materiali Nanostrutturati, Rome

Desta Antenehe Gedefaw

Chalmers, Kemi- och bioteknik, Polymerteknologi

Margherita Bolognesi

Laboratory MIST E-R

F. Liscio

Consiglio Nazionale delle Ricerche

Patrik Henriksson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Wenliu Zhuang

Chalmers, Kemi- och bioteknik, Polymerteknologi

S. Milita

Consiglio Nazionale delle Ricerche

Michele Muccini

Istituto Per Lo Studio Dei Materiali Nanostrutturati, Rome

Ergang Wang

Chalmers, Kemi- och bioteknik, Polymerteknologi

Mirko Seri

Istituto Per La Sintesi Organica E La Fotoreattivita, Bologna

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Journal of Materials Chemistry A

2050-7488 (ISSN)

Vol. 2 29 11162-11170

SUstainable Novel FLexible Organic Watts Efficiently Reliable (SUNFLOWER)

Europeiska kommissionen (FP7), 2011-10-01 -- 2016-03-31.

Ämneskategorier

Polymerteknologi

DOI

10.1039/c4ta01479k