Optical limitations in thin-film low-band-gap polymer/fullerene bulk heterojunction devices
2007 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 91, no 8, 083503- p.Article in journal (Refereed) Published
Photovoltaic devices from the low-band-gap alternating copolymer APFO-Green1, blended with the fullerene derivative BTPF70 as electron acceptor, show a pronounced variation of the external quantum efficiency with varying thickness. Device simulation, based on ellipsometric characterization, reveals that this behavior is to be expected and valid also for most low-band-gap polymers and that it can be explained by optical interference. Requirements for materials suitable for wide spectral coverage in thin-film organic solar cells are delineated. Furthermore, the internal quantum efficiency is calculated to be ≈ 0.4.
Place, publisher, year, edition, pages
2007. Vol. 91, no 8, 083503- p.
IdentifiersURN: urn:nbn:se:liu:diva-39410DOI: 10.1063/1.2736280Local ID: 48250OAI: oai:DiVA.org:liu-39410DiVA: diva2:260259