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CHARACTERIZATION AND ANALYSIS OF CIGS AND CdTe SOLAR CELLS

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A number of studies relating to the fundamental operation of CIGS and CdTe solar cells were performed during Phase II. In addition, we have worked closely with industrial and  NREL partners to evaluate specific cells, expanded our quantum efficiency capabilities, and analyzed the average annual efficiency to be expected from several commercial thinfilm modules.

The fundamental work on CIGS cells included an analysis of the expected behavior for submicron absorbers. A baseline scenario based on experimental results was compared with conditions where the absorber lifetime and its carrier concentration were reduced by an order of magnitude. Additional calculations compared front-side with back-side
illumination, again in the context of experimental results, and calculated several consequences of weak-diode areas and partial shunting, both expected to be of increasing importance for thinner CIGS. Finally, a  collaboration with NREL compared the differences between 19.5%-efficient CdZnS/CIGS cells and those made with the
conventional CdS buffer. A major CdTe project in response to the excessive voltage deficit between CdTe and single-crystal cells has been the analysis of strategies to significantly enhance voltage.
One strategy recommended for a major experimental effort is an n-i-p structure with an electron reflector before the back contact. Experimentally, CdTe lifetime and currentvoltage curves were measured as a function ofcopper amount used in the back contact, and the expected impact of low lifetimes, including artificially large A-factors, was calculated. Also, experimentally, CdTe cells made with commercially compatible processing were utilized to determine howCdS thickness affects the cell performance parameters …..

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