Graded Bandgap Solar Cells

This program has emphasized investigations of graded bandgap solar cells. The key objective was to determine the feasibility of obtaining high efficiencies with a graded emitter heterojunction structure. The Al(x)Ga(1-x) As ternary system was selected for actual device fabrication and characterizati...

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Bibliographic Details
Main Author: Olsen, Larry C
Format: Report
Language:English
Subjects:
CHARGE CARRIERS
DIFFUSION
EFFICIENCY
Electrochemical Energy Storage
EMITTERS
HETEROJUNCTIONS
LENGTH
PE61102F
PHOTOSENSITIVITY
SOLAR CELLS
TERNARY COMPOUNDS
WUAFOSR2301A7
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Summary:This program has emphasized investigations of graded bandgap solar cells. The key objective was to determine the feasibility of obtaining high efficiencies with a graded emitter heterojunction structure. The Al(x)Ga(1-x) As ternary system was selected for actual device fabrication and characterization. Interpretation of photoresponse data for graded devices indicated that the minority carrier diffusion length was essentially zero for x equal to or greater than .25. This property of the AlGaAs films made it impossible to obtain the expected photocurrent from the graded devices. However, studies were carried out which clearly indicated that the structures with graded emitters were characterized by an enhanced photoresponse relatice to homojunction devices.