Molecular engineering of panchromatic unsymmetrical squaraines for dye-sensitized solar cell applications
Three unsymmetrical squaraine dyes JK-64, JK-65, and JK-64Hx, containing a bulky spirobifluorene or hexyloxyphenyl unit are designed and synthesized. These sensitizers, when anchored onto a TiO2 surface, exhibit decreased aggregation as well as enhanced unidirectional flow of electrons. Under standard global AM 1.5 solar conditions, an optimized JK-64Hx sensitized cell gave a short-circuit photocurrent density (J(sc)) of 12.82 mA cm(-2), an open-circuit voltage (V-oc) of 0.54 V and a fill factor (ff) of 0.75, corresponding to an overall conversion efficiency (eta) of 5.20%.
Keywords: Nanocrystalline Tio2 Films ; Bis-Dimethylfluorenyl Amino ; Efficient Far-Red ; Organic Sensitizers ; Energy-Transfer ; Conversion Efficiency ; Electron-Injection ; Highly Efficient ; Alkyl Chain ; Photosensitization
Record created on 2010-04-23, modified on 2016-08-08