Stabilization of n-type silicon photoanodes against photoanodic decomposition with thin films of polyacetylene
Photoelectrochemical cells based on polyacetylene coated n-Si photoanodes, n-Si/(CH)/sub x/, in 11 M LiCl solutions containing I/sup -//sub 3//I/sup -/ have been investigated. The n-Si/(CH)/sub x/ photoanodes show a substantial improvement in durability compared to naked n-Si photoanodes. The efficiency of these photoelectrochemical cells appears to be limited by a low observed quantum yield for electron flow due to absorption of light by the electrolyte solution and by the (CH)/sub x/ film. Overall efficiency of 1.9% of the conversion of 632.8-nm light (21 mW/cm/sup 2/) can be sustained for >20 h without significant decline in efficiency. The n-Si/(CH)/sub x/ photoanode immersed in I/sup -//sub 3//I/sup -/ media behaves as a Schottky barrier or metal-insulator-semiconductor structure where the (CH)/sub x/ can be viewed as having a variable work function depending on the extent of doping. decomposition with thin films of polyacetylene
- Research Organization:
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
- OSTI ID:
- 6653581
- Journal Information:
- Appl. Phys. Lett.; (United States), Vol. 44:9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACETYLENE
SURFACE COATING
PHOTOANODES
COATINGS
STABILIZATION
PHOTOELECTROCHEMICAL CELLS
EFFICIENCY
DECOMPOSITION
ELECTROLYTES
LIFETIME
LITHIUM CHLORIDES
SCHOTTKY BARRIER DIODES
SILICON
THIN FILMS
WORK FUNCTIONS
ALKALI METAL COMPOUNDS
ALKYNES
ANODES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
DEPOSITION
ELECTROCHEMICAL CELLS
ELECTRODES
ELEMENTS
EQUIPMENT
FILMS
FUNCTIONS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
LITHIUM COMPOUNDS
LITHIUM HALIDES
ORGANIC COMPOUNDS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMIMETALS
SOLAR EQUIPMENT
140501* - Solar Energy Conversion- Photovoltaic Conversion