Solution-processed bulk-heterojunction organic solar cells employing Ir complexes as electron donors
2014 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 2, no 31, 12390-12396 p.Article in journal (Refereed) Published
To explore enhancing photocurrent in organic solar cells (OSCs) via harvesting triplet excitons, two novel bicycloiridium complexes (R-1 and R-2) are designed and synthesized. Conventional bulk-heterojunction triplet OSCs are solution processed using R-1 or R-2 as sole electron donors and phenyl-C-71-butyric acid methyl ester (PC71BM) as the electron acceptor. A decent short circuit current (J(sc)) of 6.5 mA cm(-2) is achieved though the overlap between the absorption spectrum (with similar to 550 nm absorption onset) of R-2 and the solar flux is relatively small. With an open circuit voltage of 0.74 V and a fill factor of 0.42, an encouraging power conversion efficiency of 2.0% is achieved in the OSCs based on R-2 and PC71BM without any processing additives and post-treatments. Our preliminary result demonstrates the possibility of utilizing Ir complexes as sole electron donors in OSCs, which extends available soluble small molecules for OSCs.
Place, publisher, year, edition, pages
Royal Society of Chemistry , 2014. Vol. 2, no 31, 12390-12396 p.
Biological Sciences Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-109603DOI: 10.1039/c4ta01526fISI: 000339625500035OAI: oai:DiVA.org:liu-109603DiVA: diva2:739421