Aggregation and Electrolyte Composition Effects on the Efficiency of Dye-Sensitized Solar Cells. A Case of a Near-Infrared Absorbing Dye for Tandem Cells
2014 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 1, 194-205 p.Article in journal (Refereed) Published
Time-resolved laser spectroscopy studies of complete solar cells sensitized with a near-IR absorbing dye (HY103) and filled with different electrolytes are applied to explain their macroscopic parameters (efficiency and short-circuit current). Particular attention is paid to the effect of coadsorbent, size of cations in electrolyte (lithium vs. guanidine ones), and addn. of tert-butylpyridine. A complete deactivation scheme in the cell is revealed, and the rates of electron injection and all other processes are explored. For the most efficient electrolyte, the electron injection rate consts. are 0.21 ps-1 from monomers and 0.07 ps-1 from H-aggregates. Moreover, two important and novel findings are revealed: energy transfer from the excited state of monomers to H-aggregates (with rate consts. from 0.04-0.25 ps-1) and the decrease of internal conversion rate in HY103 attached to the nanoparticles (0.01 ps-1) with respect to that of free dye in soln. (0.06 ps-1). Thus, the study gives more clues to better understand the photobehavior of dye-sensitized solar cells. [on SciFinder(R)]
Place, publisher, year, edition, pages
2014. Vol. 118, no 1, 194-205 p.
dye sensitized solar cell efficiency aggregation electrolyte compn effect
IdentifiersURN: urn:nbn:se:uu:diva-218465DOI: 10.1021/jp410106kOAI: oai:DiVA.org:uu-218465DiVA: diva2:695821
CAPLUS AN 2013:1908948(Journal; Online Computer File)2014-02-122014-02-122014-09-30Bibliographically approved