Thin-Film Amorphous Silicon Alloy Research Partnership: Final Technical Progress Report, 2 February 1995-28 February 1998

Research output: NRELSubcontract Report

Abstract

This report describes the status and accomplishments of work performed by United Solar Systems Corp. under this subcontract. Investigations were carried out on Ag/ZnO, Ag/TiO2/ZnO and Ag/MgF2/ZnO back reflectors to assess their suitability for use in cell structures. Arrays of high-efficiency component cells were made over 1-ft2 areas. Single-junction top cells were made with an averagestabilized power density of 5.4 mW/cm2 measured under global AM1.5 illumination. Single-junction middle cells were optimized to give average stabilized power density of 3.6 mW/cm2 under global AM1.5 illumination with a cut-on filter with ..lamda..> 530 nm. Arrays of high-efficiency triple-junction cells of 0.25-cm2 active area were fabricated over 1-ft2 area with average stabilized efficiency of12% as measured under AM1.5 illumination. A triple-junction module of a 416-cm2 aperture area was fabricated with an initial efficiency of 11.7% and stabilized efficiency of 10.24%. A 922-cm2 aperture-area module exhibited an initial efficiency of 11.5%. The novel laser-drilling approach was used successfully to fabricate modules of 1-ft2 area with shadow loss of approximately 1%. Using thislaser- drilling approach, an initial total-area efficiency of 11.5% was achieved in a triple-cell structure of 12.6 cm2 area. An initial total-area efficiency of 10.6% was achieved in a module of 300-cm2 area. Reliability studies based on NREL's Interim Qualification Testing were carried out to confirm the suitability of the module encapsulation materials and processes.
Original languageAmerican English
PublisherNational Renewable Energy Laboratory (NREL)
Number of pages69
StatePublished - 1998

Bibliographical note

Work performed by United Solar Systems Corp., Troy, Michigan

NREL Publication Number

  • NREL/SR-520-24723

Keywords

  • a-Si
  • alloy modules
  • amorphous silicon
  • multijunction approach

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