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Dissertation
Thin film CuInSe₂/Cd(Zn)S heterojunction solar cell: characterization and modeling
Doctor of Philosophy (Ph.D.), Drexel University
1984
DOI:
https://doi.org/10.17918/00009157
Abstract
The results of experimental measurements and characterization of high efficiency, thin film CuInSe₂/Cd(Zn)S solar cells provided by Boeing are reported. These devices are produced by elemental evaporation; they have very high I_[SC] but lower than expected V_[OC] and FF. An automated, multi-purpose experimental station was developed which can carry out capacitance, current, spectral response measurements as a function of voltage, frequency, wavelength, light bias intensity and temperature. The device is modeled as a p-i-n heterojunction where the interface largely determines the device properties and transport. Long time constants of capacitance transients were observed as light or voltage bias was changed. From such transient data it is deduced that a bulk deep level hole trap exists in the selenide which has a density nearly the same as the free carrier density. It was also observed that the photocurrent is strongly bias dependent in violation of the superposition principle. It is shown, by using chopped light data of collection efficiency and the dark I-V, that the "light" diode can be fully explained on the basis of a voltage dependence of the photocurrent. The crossover of light and dark I-V curves is similarly explained. The effects of such a voltage dependent collection factor on all cell parameters are analyzed and explained. Heat treatments were carried out, and device parameters and cell performance were monitored as a function of baking. It is concluded that baking mainly improves the selenide properties rather than improving the interface. A detailed interface charging model is proposed which successfully accounts for A, I_O and the voltage dependence of the photocurrent. It is concluded that higher efficiencies, on the order of 13-14%, are possible if selenide conductivities can be increased, R_S lowered, conduction band discontinuity reduced, back contact improved and higher energy photons are utilized in I_[SC] by an electroluminescent front cover.
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Details
- Title
- Thin film CuInSe₂/Cd(Zn)S heterojunction solar cell
- Creators
- Murat Nezir Eron
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xii, 198 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021888867404721