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Proceedings Paper

Nanoengineered CIGS thin films for low cost photovoltaics
Author(s): Louay Eldada; Matthew Taylor; Baosheng Sang; Scott McWilliams; Robert Oswald; Billy J. Stanbery
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Paper Abstract

Low cost manufacturing of Cu(In,Ga)Se2 (CIGS) films for high efficiency photovoltaic devices by the innovative Field-Assisted Simultaneous Synthesis and Transfer (FASST®) process is reported. The FASST® process is a two-stage reactive transfer printing method relying on chemical reaction between two separate precursor films to form CIGS, one deposited on the substrate and the other on a printing plate in the first stage. In the second stage these precursors are brought into intimate contact and rapidly reacted under pressure in the presence of an applied electrostatic field. The method utilizes physical mechanisms characteristic of anodic wafer bonding and rapid thermal annealing, effectively creating a sealed micro-reactor that ensures high material utilization efficiency, direct control of reaction pressure, and low thermal budget. The use of two independent ink-based or PVD-based nanoengineered precursor thin films provides the benefits of independent composition and flexible deposition technique optimization, and eliminates pre-reaction prior to the second stage FASST® synthesis of CIGS. High quality CIGS with large grains on the order of several microns are formed in just several minutes based on compositional and structural analysis by XRF, SIMS, SEM and XRD. Cell efficiencies of 12.2% have been achieved using this method.

Paper Details

Date Published: 10 September 2008
PDF: 8 pages
Proc. SPIE 7039, Nanoengineering: Fabrication, Properties, Optics, and Devices V, 70390M (10 September 2008); doi: 10.1117/12.796877
Show Author Affiliations
Louay Eldada, HelioVolt Corp. (United States)
Matthew Taylor, HelioVolt Corp. (United States)
Baosheng Sang, HelioVolt Corp. (United States)
Scott McWilliams, HelioVolt Corp. (United States)
Robert Oswald, HelioVolt Corp. (United States)
Billy J. Stanbery, HelioVolt Corp. (United States)

Published in SPIE Proceedings Vol. 7039:
Nanoengineering: Fabrication, Properties, Optics, and Devices V
Elizabeth A. Dobisz; Louay A. Eldada, Editor(s)

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