Journal
ORGANIC ELECTRONICS
Volume 13, Issue 1, Pages 23-30Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2011.09.024
Keywords
Dye-sensitized solar cell; Melt-processable; Organic hole transporting material; Transient absorption spectroscopy
Funding
- Research Council of Lithuania [MIP-64/2010]
- EPSRC
- Engineering and Physical Sciences Research Council [1034156] Funding Source: researchfish
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A new method for melting hole transporting materials (HTM) into mesoporous TiO2 electrodes to obtain solid-state dye-sensitized solar cells (DSSC) is reported. Internal coverage is determined from the efficiency of hole conductor oxidation by photo-oxidized dyes (dye regeneration), measured using transient absorption spectroscopy. High efficiency regeneration indicates complete coverage of the electrode internal surface. A high work function hole conductor (>5.2 eV) was found to give shorter regeneration lifetimes (<1 mu s) and better regeneration efficiencies (>90%) than expected. Cell photocurrents were low, but improved after iodine vapor doping of the hole conductor. Counter intuitively, doping also reduced the recombination rate constant 7-fold. A solid state solar cell with power conversion efficiency of 0.075% at 1 sun is reported. (C) 2011 Elsevier B. V. All rights reserved.
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