Thermal Manipulation of Deactivation Processes in Luminescent Photoelectrochemical Cells Employing Tellurium-Doped Cadmium Sulfide Photoelectrodes.
WISCONSIN UNIV-MADISON DEPT OF CHEMISTRY
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Temperature significantly modifies the efficiencies of luminescence and photocurrent in an n-type, single crystal, CdSTe-based photoelectrochemical cell PEC employing aqueous polyselenide electrolyte. Between 20 and 100 C photocurrent quantum yield phi sub x from ultraband gap 501.7 nm excitation increases modestly by less than or 20, whereas photocurrent from bandgap edge 514.5 nm excitation increases by about an order of magnitude, reaching 50-100 of the 20 C 501.7 nm photocurrent. Undoped CdS exhibits a similar photocurrent-temperature profile. Higher temperatures thus extend the wavelength response of CdS- and CdSTe-based PECs. In contrast to the increase in photocurrent, emissive efficiency quantum yield phi sub r of CdSTe drops by a factor of approximately 10-20 over the same temperature range this decline is relatively insensitive to potential and excitation wavelength 501.7 or 514.5 nm.
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