Abstract
A photoelectrochemical solar cell based on an n‐GaAs/polymer‐redox‐electrolyte junction is reported. Di(ethylene glycol)ethyl ether acrylate containing ferrocene as a redox species and benzoin methyl ether as a photoinitiator is polymerized in situ. Propylene carbonate is used as a plasticizer to improve the conductivity of the polymer redox electrolyte. For thin (1 μm) polymer electrolytes, the series resistance of the cell is negligible. However, the short‐circuit photocurrent density of the cell at light intensities above 10 mW/cm2 is limited by mass transport of redox species within the polymer matrix. At a light intensity of 70 mW/cm2, a moderate light‐to‐electrical energy conversion efficiency (3.1%) is obtained. The interfacial charge‐transfer properties of the cell in the dark and under illumination are studied.
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