Implementation of a Comprehensive On-Line Closed-Loop Diagnostic System for Roll-to-Roll Amorphous Silicon Solar Cell Production: Final Subcontract Report, 23 April 2003 - 30 September 2006
This report summarizes Energy Conversion Devices' diagnostic systems that were developed in this program, as well as ECD's other major accomplishments. This report concentrates on work carried out in the final (third) phase of this program, beginning in the fall of 2004 and ending in the fall of 2006. ECD has developed a comprehensive in-situ diagnostic system that: Reduces the time between deposition in the a-Si machine and device characterization from about 200 h to about 1 h; The Photovoltaic Capacitive Diagnostic systems measure the open-circuit voltage and charging rate (a measure of the short-circuit current) and intra-cell series resistance for each cell in the triple-junction device prior to deposition of the top conductive-oxide coating in a subsequent deposition machine. These systems operate with an rms precision of about 0.03% and have operated for almost 4 years with no need for servicing of the electronics or for calibration; Spectrometers are used to measure the ZnO thickness of the backreflector, a Si thickness, and top conductive-oxide, coatings.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC36-99-GO10337
- OSTI ID:
- 908019
- Report Number(s):
- NREL/SR-520-41560; ZDO-0-30628-11; TRN: US200722%%399
- Resource Relation:
- Related Information: Work performed by Energy Conversion Devices, Inc., Troy, Michigan
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
47 OTHER INSTRUMENTATION
CALIBRATION
COATINGS
DEPOSITION
ENERGY CONVERSION
IMPLEMENTATION
PRODUCTION
SILICON SOLAR CELLS
SPECTROMETERS
THICKNESS
SOLAR ENERGY
DIAGNOSTIC TECHNIQUES
PV
ON-LINE CLOSED-LOOP DIAGNOSTIC SYSTEM
AMORPHOUS SILICON
SOLAR CELLS
PHOTOVOLTAIC CAPACITIVE DIAGNOSTIC (PVCD)
OPEN-CIRCUIT VOLTAGE
CHARGING RATE
SHORT-CIRCUIT CURRENT
TOP CONDUCTIVE OXIDE COATING
BACKREFLECTOR
TRIPLE-JUNCTION DEVICE
Solar Energy - Photovoltaics