Two-in-one: cathode modification and improved solar cell blend stability through addition of modified fullerenes
2016 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 4, no 7, 2663-2669 p.Article in journal (Refereed) PublishedText
The synthesis of dual purpose modified fullerenes with pyridine-as well as amine-functional groups is reported. Addition of these fullerenes to a polymer : fullerene bulk-heterojunction blend based on a thiophene-quinoxaline donor polymer is found to modify the active layer/cathode interface of inverted solar cells (glass/ITO/active layer/MoO3/Al). In particular the open-circuit voltage of devices is increased from 0.1 V to about 0.7 V, which results in a drastic rise in photovoltaic performance with a power conversion efficiency of up to 3%. At the same time, presence of the functionalised fullerene additives prevents the detrimental formation of micrometre-sized fullerene crystals upon annealing at 140 degrees C. As a result, the device performance is retained, which promises significantly increased thermal stability of the bulk-heterojunction blend nanostructure.
Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2016. Vol. 4, no 7, 2663-2669 p.
IdentifiersURN: urn:nbn:se:liu:diva-125692DOI: 10.1039/c5ta06420aISI: 000369665800033OAI: oai:DiVA.org:liu-125692DiVA: diva2:908198
Funding Agencies|Swedish Energy Agency; Swedish Research Council; Knut and Alice Wallenberg Foundation; Chinese Scholarship Council (CSC); South Australian government2016-03-012016-02-292016-03-01