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Efficient, Cyanine Dye Based Bilayer Solar Cells
Author(s) -
Malinkiewicz Olga,
Grancha Thais,
MolinaOntoria Agustin,
Soriano Alejandra,
Brine Hicham,
Bolink Henk J.
Publication year - 2013
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201200764
Subject(s) - cyanine , bilayer , materials science , pedot:pss , hexafluorophosphate , open circuit voltage , solar cell , acceptor , hybrid solar cell , optoelectronics , analytical chemistry (journal) , chemical engineering , polymer solar cell , layer (electronics) , nanotechnology , voltage , organic chemistry , optics , chemistry , membrane , ionic liquid , engineering , condensed matter physics , biochemistry , quantum mechanics , fluorescence , catalysis , physics
Simple bilayer solar cells, using commercially available cationic cyanine dyes as donors and evaporated C 60 layer as an acceptor are prepared. Cyanine dyes with absorption maxima of 578, 615 and 697 nm having either perchlorate or hexafluorophosphate counter‐ions are evaluated. The perchlorate dye leads to cells with S‐shape current‐voltage curves; only the dyes with the hexafluorophosphate counter‐ions lead to efficient solar cells. When the wide bandgap dyes are employed, S‐shape current‐voltage curves are obtained when the conductive polymer PEDOT:PSS is used as hole transport layer. Substitution of PEDOT:PSS with MoO 3 leads to cells with more rectangular current–voltage curves and high fill factors. Additionally, the cells using the MoO 3 layer for hole extraction lead to high open circuit voltages of 0.9 V. In the case that a low bandgap hexafluorophosphate dye is used with the HOMO above that of the PEDOT:PSS the cell performance is independent on the type of hole transport layer employed. Using this approach, bilayer solar cells are obtained with power efficiencies ranging from 1.8 to 2.9% depending on the particular dye employed. These are impressive numbers for bilayer solar cell that are partially solution processed in ambient conditions.