Saturday, January 17, 2015 7:15:18 PM
http://pubs.rsc.org/en/content/articlelanding/2014/fd/c4fd00185k#!divAbstract
Plasmonic nanosystems have recently been shown to be capable of functioning as photovoltaics and of carrying out redox photochemistry, purportedly using as charge carriers the energetic electrons and holes created following plasmonic decay. Although such devices currently have low efficiency, they already manifest a number of favorable characteristics, such as their tunability over the entire solar spectrum and a remarkable resistance to photocorrosion. Here we report a plasmonic photovoltaic using a 25 µm thick electrolytic liquid junction which supports the iodide-triiodide (I-/I3-) redox couple. The device produces photocurrent densities in excess of 40 µA cm-2, an open circuit voltage (Voc) of ~0.24 V and a fill factor of ~0.5 using AM 1.5 solar radiation at 100 mW cm-2. The photocurrents and the power conversion efficiency were primarily limited by the low light absorption in the 2-D gold nanoparticle arrays. The use of a liquid junction greatly reduces dielectric breakdown in the oxide layers utilized, which for optimal performance must be very thin, leading to great improvement in the long-term stability of the cell’s performance.
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