Efficient dye-sensitized solar cells based on an iodine-free electrolyte using L-cysteine/L-cystine as a redox couple
2012 (English)In: Energy & Environmental Science, ISSN 1754-5692, Vol. 5, no 4, 6290-6293 p.Article in journal (Refereed) Published
A new iodine-free electrolyte based on amino acids L-cysteine/L-cystine as a redox couple has been designed and synthesized. DSSCs fabricated with the conventional I-/I-3(-) redox couple gave efficiencies of 8.1% and 6.3% under optimized experimental conditions based on ruthenium dye, N719, and metal-free organic dye, TH202, respectively. Based on the same dyes, the DSSCs employing the new L-cysteine/L-cystine redox couple showed comparable efficiencies of 7.7% and 5.6%, respectively. However, higher incident-photon-to-electron (IPCE) conversion efficiencies and larger J(sc) values were found for devices with the L-cysteine/L-cystine redox couple than with I-/I-3(-). From an electrochemical impedance spectroscopic study, we found that the charge recombination between the conduction band electrons in the TiO2 film and the electrolyte containing the L-cysteine/L-cystine redox couple is restrained.
Place, publisher, year, edition, pages
2012. Vol. 5, no 4, 6290-6293 p.
IdentifiersURN: urn:nbn:se:kth:diva-93642DOI: 10.1039/c1ee02540fISI: 000301984200003ScopusID: 2-s2.0-84858991150OAI: oai:DiVA.org:kth-93642DiVA: diva2:517532
FunderKnut and Alice Wallenberg Foundation
QC 201204242012-04-242012-04-232012-04-24Bibliographically approved