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Title: Photoluminescence-based quality control for thin film absorber layers of photovoltaic devices

A time-resolved photoluminescence-based system providing quality control during manufacture of thin film absorber layers for photovoltaic devices. The system includes a laser generating excitation beams and an optical fiber with an end used both for directing each excitation beam onto a thin film absorber layer and for collecting photoluminescence from the absorber layer. The system includes a processor determining a quality control parameter such as minority carrier lifetime of the thin film absorber layer based on the collected photoluminescence. In some implementations, the laser is a low power, pulsed diode laser having photon energy at least great enough to excite electron hole pairs in the thin film absorber layer. The scattered light may be filterable from the collected photoluminescence, and the system may include a dichroic beam splitter and a filter that transmit the photoluminescence and remove scattered laser light prior to delivery to a photodetector and a digital oscilloscope.
Inventors:
;
Issue Date:
OSTI Identifier:
1190914
Assignee:
Alliance for Sustainable Energy, LLC (Golden, CO) NREL
Patent Number(s):
9,075,012
Application Number:
13/673,581
Contract Number:
AC36-08GO28308
Resource Relation:
Patent File Date: 2012 Nov 09
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Other works cited in this record:

Recombination kinetics and stability in polycrystalline Cu(In,Ga)Se2 solar cells
journal, February 2009

Rapid CIS-process for high efficiency PV-modules: development towards large area processing
journal, May 2001

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