2D π-conjugated benzo[1,2-b:4,5-b']dithiophene- and quinoxaline-based copolymers for photovoltaic applications
Artikel i vetenskaplig tidskrift, 2013

Two medium gap semiconducting polymers, P(1)-Q-BDT-4TR and P(2)-FQ-BDT-4TR, based on alternate units of alkyl-dithiophene substituted benzodithiophene (BDT) and quinoxaline units (without or with fluorine substitution), are synthesized and fully characterized. The polymers exhibit optical and electrical properties favorable for being employed as donors in BHJ OPV devices, such as: absorption spectra extending up to around 720 nm for a high solar spectrum coverage, deep lying HOMO energy levels for a high device open circuit voltage and LUMO energy levels higher than those of PC61BM and PC71BM for an efficient exciton dissociation. In particular, the presence of alkyl-dithiophene side chains allows us to obtain a high 2D π-conjugation which promotes red shifted absorption profiles, low HOMO energy levels (<−5.6 eV) and enhanced environmental and thermal stability. Moreover, the introduction of the fluorine atom in the polymer backbone allows us to obtain efficient OPV devices, based on as-cast P(2)-FQ-BDT-4TR:PC61BM blend, showing a JSC of −10.2 mA cm−2, VOC of 0.90 V, FF of 58% and PCE of 5.3%, without the need for any additional thermal treatment.

Författare

Margherita Bolognesi

Laboratory MIST E-R

Desta Antenehe Gedefaw

Chalmers, Kemi- och bioteknik, Polymerteknologi

Dongfeng Dang

Chalmers, Kemi- och bioteknik, Polymerteknologi

Patrik Henriksson

Chalmers, Kemi- och bioteknik, Polymerteknologi

Wenliu Zhuang

Chalmers, Kemi- och bioteknik, Polymerteknologi

Marta Tessarolo

Istituto Per Lo Studio Dei Materiali Nanostrutturati, Rome

Ergang Wang

Chalmers, Kemi- och bioteknik, Polymerteknologi

Michele Muccini

Istituto Per Lo Studio Dei Materiali Nanostrutturati, Rome

Mirko Seri

Istituto Per La Sintesi Organica E La Fotoreattivita, Bologna

Mats Andersson

Chalmers, Kemi- och bioteknik, Polymerteknologi

RSC Advances

2046-2069 (ISSN)

Vol. 3 46 24543-24552

SUstainable Novel FLexible Organic Watts Efficiently Reliable (SUNFLOWER)

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

Ämneskategorier

Materialteknik

Fysik

Naturresursteknik

Kemiteknik

Elektroteknik och elektronik

Kemi

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Styrkeområden

Materialvetenskap

DOI

10.1039/C3RA44238A