Enhance performance of organic solar cells based on an isoindigo-based copolymer by balancing absorption and miscibility of electron acceptor
2011 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 99, no 14, 143302- p.Article in journal (Refereed) Published
Superior absorption of PC(71)BM in visible region to that of PC(61)BM makes PC(71)BM a predominant acceptor for most high efficient polymer solar cells (PSCs). However, we will demonstrate that power conversion efficiencies (PCEs) of PSCs based on poly[N,N-bis(2-hexyldecyl)isoindigo-6, 6-diyl-alt-thiophene-2,5-diyl] (PTI-1) with PC(61)BM as acceptor are 50% higher than their PC71BM counterparts under illumination of AM1.5G. AFM images reveal different topographies of the blends between PTI-1:PC(61)BM and PTI-1:PC(71)BM, which suggests that acceptors miscibility plays a more important role than absorption. The photocurrent of 9.1 mA/cm(2) is among the highest value in PSCs with a driving force for exciton dissociation less than 0.2 eV.
Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2011. Vol. 99, no 14, 143302- p.
photoconductivity, polymer blends, solar cells, solubility
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-72028DOI: 10.1063/1.3645622ISI: 000295625100091OAI: oai:DiVA.org:liu-72028DiVA: diva2:455999
Funding Agencies|Swedish Energy Agency||Swedish Research Council (VR)||VINNOVA||2011-11-112011-11-112015-06-01