Nanoengineered CIGS thin films for low cost photovoltaics

Louay Eldada; Matthew Taylor; Baosheng Sang; Scott McWilliams; Robert Oswald; Billy J. Stanbery

doi:10.1117/12.796877

10 September 2008 Nanoengineered CIGS thin films for low cost photovoltaics

Louay Eldada, Matthew Taylor, Baosheng Sang, Scott McWilliams, Robert Oswald, Billy J. Stanbery

Proceedings Volume 7039, Nanoengineering: Fabrication, Properties, Optics, and Devices V; 70390M (2008) https://doi.org/10.1117/12.796877
Event: NanoScience + Engineering, 2008, San Diego, California, United States

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.

Citation Download Citation

Louay Eldada, Matthew Taylor, Baosheng Sang, Scott McWilliams, Robert Oswald, and Billy J. Stanbery "Nanoengineered CIGS thin films for low cost photovoltaics", Proc. SPIE 7039, Nanoengineering: Fabrication, Properties, Optics, and Devices V, 70390M (10 September 2008); https://doi.org/10.1117/12.796877

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KEYWORDS

Copper indium gallium selenide

Manufacturing

Scanning electron microscopy

Printing

Thin films

Photovoltaics

Solar cells

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