Electroluminescence of polycrystalline CdSe thin film photoelectrodes: a sensitive probe for surface recombination
Photoluminescence (PL) and Electroluminescence (EL) measurements have been used to characterize the excited state properties of Cdchalcogenide single crystal electrodes in photoelectrochemical solar cells (PEC's). Polycrystalline thin film electrodes of these materials, which are promising candidates for the efficient photoelectrochemical solar energy conversion, have been studied only very recently using PL. As EL originates more close to the surface of the electrodes, it is considered a probe of recombination more sensitive than PL to the surface conditions of the sample. The authors report the first EL measurements with electrodeposited thin film CdSe electrodes and tahe enhancement of EL efficiency upon photoetching (4). CdSe thin film electrodes were prepared onto Ti substrates by electroplating according to literature procedures. The electrodes were annealed at 600/sup 0/C in N/sub 2/ and photoetched in a (0.3:9.7:90) HNO/sub 3/:HC1:H/sub 2/O solution under white light illumination shortening the photoelectrode to a carbon counterelectrode. Room temperature luminescence spectra were taken with a 0.5m SPEX monochromator and a cooled S-1 EMI photomultiplier. The 5145 /sup 0/A line of a Coherent Radiation model 52 Ar+ ion laser was used to excite PL. The laser beam was expanded, having an intensity of about 100mW/cm/sub 2/ at the sample. During PL the sample was kept in air. EL measurements were performed in a N/sub 2/ purged 0.1 M Na/sub 2/S/sub 2/O/sub 8/ + 2.5 M KOH electrolyte. The electrode potential was pulsed between O V (SCE) (10 s) and -1.5 V (SCE) (1 s) while scanning the monochromator at 5/sup 0/A/s. A speccially constructed electrode holder enabled us to mount the electrodes in a reproducible way for taking the spectra.
- Research Organization:
- Instituto de Fisica, UNICAMP, 13.100 Campinas, SP
- OSTI ID:
- 6085412
- Journal Information:
- J. Electrochem. Soc.; (United States), Vol. 131:9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM SELENIDES
ELECTROLUMINESCENCE
PHOTOLUMINESCENCE
PHOTOELECTROCHEMICAL CELLS
ELECTRODES
PERFORMANCE
RECOMBINATION
ANNEALING
ELECTROPLATING
ETCHING
FABRICATION
THIN FILMS
CADMIUM COMPOUNDS
CHALCOGENIDES
DEPOSITION
ELECTROCHEMICAL CELLS
ELECTRODEPOSITION
ELECTROLYSIS
EQUIPMENT
FILMS
HEAT TREATMENTS
LUMINESCENCE
LYSIS
PLATING
SELENIDES
SELENIUM COMPOUNDS
SOLAR EQUIPMENT
SURFACE COATING
SURFACE FINISHING
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)