Journal
NEW JOURNAL OF CHEMISTRY
Volume 42, Issue 11, Pages 9045-9050Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nj00803e
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- Deanship of Scientific Research (DSR), King Abdulaziz University [72-130-35-HiCi]
- KAU
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We designed and synthesized a metal-free organic sensitizer based on phenothiazine as the core moiety for application in dye-sensitized solar cells (DSCs). The structure of the donor--bridge-acceptor (D--A) dye 3-(5-(7-((E)-3,4,5-trimethoxystyryl)-10-octyl-10H-phenothiazin-3-yl)thiophen-2-yl)-2-cyanoacrylic acid (TMPTZT) has tri-methoxy phenyl as a donor segment on a phenothiazine core and cyanoacrylic acid as an acceptor group. In this study, we investigated the influence of iodide/triiodide and Co(bpy)(3)(2+/3+) complexes as redox electrolytes on the DSC device performance. The maximal monochromatic incident photon to current conversion efficiency (IPCE) reached a value of 70%. The solar light to electrical energy conversion efficiency of the devices with a volatile solvent based iodide/triiodide electrolyte reached up to 5.1% at AM 1.5G illumination, whereas the devices with Co(bpy)(3)(2+/3+) and ionic liquid electrolytes showed efficiencies of 4.9% and 4.5%, respectively. The DSC devices were characterized using charge extraction and V-oc decay techniques to understand the difference in the photovoltaic performance of this metal free organic dye with these three types of redox electrolytes.
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