Effect of Cu diffusion in a Cu/sub 2/S/CdS heterojunction solar cell
The effect of copper diffusion from the p-Cu/sub 2/S into the n-CdS region, due to heat treatment, in a Cu/sub 2/S/CdS heterojunction photovoltaic cell is investigated, using the energy band diagram resulting from a modified Schottky barrier in the CdS and the solution of the one-dimensional Poisson's equation with appropriately assumed boundary conditions and diffusion model of Gaussian profile for the Cu-acceptor concentration in the CdS. The variation of the short-circuit current density J/sub sc/ and that of the fill factor of the device with the copper-diffusion parameters zeta and L/sub A/ are analyzed. Here zeta denotes the fraction of copper acceptors within the Cu/sub 2/S region which has diffused into the n-CdS region and L/sub A/ is the mean diffusion length of copper. It is shown that both J/sub sc/ and fill factor decrease with zeta while they increase with L/sub A/. The sample calculation, made for room-temperature operation of the device, indicates that the reduction in J/sub sc/ and fill factor can be appreciable if the amount of copper diffused is sufficient. This theoretical observation is consistent with some experimental results which have been reported elsewhere.
- Research Organization:
- Iowa State Univ., Ames, IA
- OSTI ID:
- 5822203
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 53:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM SULFIDE SOLAR CELLS
CURRENT DENSITY
HEAT TREATMENTS
COPPER SULFIDE SOLAR CELLS
COPPER
DIFFUSION
DIFFUSION LENGTH
ENERGY LEVELS
HETEROJUNCTIONS
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
N-TYPE CONDUCTORS
P-TYPE CONDUCTORS
PHOTOVOLTAIC EFFECT
POISSON EQUATION
SCHOTTKY BARRIER DIODES
THEORETICAL DATA
DATA
DIFFERENTIAL EQUATIONS
DIMENSIONS
DIRECT ENERGY CONVERTERS
ELEMENTS
EQUATIONS
EQUIPMENT
INFORMATION
JUNCTIONS
LENGTH
MATERIALS
METALS
NUMERICAL DATA
PARTIAL DIFFERENTIAL EQUATIONS
PHOTOELECTRIC CELLS
PHOTOELECTROMAGNETIC EFFECTS
PHOTOVOLTAIC CELLS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMICONDUCTOR JUNCTIONS
SEMICONDUCTOR MATERIALS
SOLAR CELLS
SOLAR EQUIPMENT
TRANSITION ELEMENTS
140501* - Solar Energy Conversion- Photovoltaic Conversion