Amorphous Silicon Alloy Triple-Junction Solar Cell with 14.6% initial and 13.0% Stable Efficiencies

Research output: Contribution to conferencePaper

Abstract

An initial conversion efficiency of 14.6 percent has been achieved using amorphous silicon-based alloy in a spectrum splitting triple-junction structure. After 1000 hours of indoor one-sun light soaking at 50 degrees C, the stabilized efficiency is 13.0 percent. Both efficiencies are the highest reported to date for amorphous silicon alloy solar cells and have been independently confirmed by theNational Renewable Energy Laboratory. The device was deposited onto a stainless steel substrate coated with textured silver/zinc oxide back reflector. The bottom and middle cells use amorphous silicon-germanium alloys, employing high hydrogen dilution in the gas mixture and bandgap profiling in the cell design. The top cell uses amorphous silicon alloy with high hydrogen dilution. Key factorsleading to the achievement include a) improvement of the bottom cell that exhibits an AM1.5 efficiency of 10.4 percent and quantum efficiency of 45 percent at 850 nm; b) improvement of the tunnel junctions between the component cells by incorporating a novel multilayered structure with microcrystalline p and n layers; and c) improvement of transparent conductive oxide for enhancing the shortwavelength response of the top cell.
Original languageAmerican English
Pages693-698
Number of pages6
StatePublished - 1997
EventAmorphous and Microcrystalline Silicon Technology 1997: Materials Research Society Symposium - San Francisco, California
Duration: 31 Mar 19974 Apr 1997

Conference

ConferenceAmorphous and Microcrystalline Silicon Technology 1997: Materials Research Society Symposium
CitySan Francisco, California
Period31/03/974/04/97

Bibliographical note

Work performed by United Solar Systems Corporation, Troy, Michigan

NREL Publication Number

  • NREL/CP-520-24559

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