A stability study of polymer solar cells using conjugated polymers with different donor or acceptor side chain patterns
A stability study of polymer solar cells using conjugated polymers with different donor or acceptor side chain patterns,JOURNAL OF MATERIALS CHEMISTRY A,4(42): 16677-16689,2016.
Improvement of the power conversion efficiency and long term stability remains to be of crucial importance for the further development of polymer solar cells (PSCs). Herein, a donor-acceptor copolymer based on 4,8-di(thiophene-2'-yl)benzo[1,2-b:4,5-b']dithiophene (DTBDT) and 4,7-di(thiophene-2'-yl)benzo[c][1,2,5]thiadiazole (DTBT), specifically selected because of its suitability for roll-coating in the ambient environment, is investigated in terms of operational stability via partial exchange (5 or 10%) of the alkyl side chain on either the donor or the acceptor monomer with a 2-hydroxyethyl or 2-phenylethyl group. It is shown that the exchange of the hexyl chain on the DTBT moiety has a negative impact on the stability of the polymer as well as on the performance of the resulting PSCs. On the other hand, partial exchange of the 2-hexyldecyl side chain of the BDT unit by a 2-hydroxyethyl group results in an improved photochemical stability of the polymer film and a higher efficiency of 5.6% for the spin-coated PSC. The stability of roll-coated devices also slightly increases with the incorporation of 10% of either the 2-hydroxyethyl or 2-phenylethyl side chain.
author = "Heckler, I.M.; Kesters, J.; Defour, M.; Penxten, H.; Van Mele, B.; Maes, W.; Bundgaard, E.",
title = " A stability study of polymer solar cells using conjugated polymers with different donor or acceptor side chain patterns",
journal = "JOURNAL OF MATERIALS CHEMISTRY A",
year = "2016",
volume = "4",
number = "42",
pages = "16677-16689",
month = "",
doi = "10.1039/c6ta07244e",
note = "",