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C3MJ Small Aperture Products
C3MJ Small Aperture Products
The document describes a triple junction solar cell with a typical efficiency of 38.5% and a recommended operating temperature of less than 110°C. The epitaxial structure consists of GaInP (1.88 eV), GaInAs (1.41 eV), and Ge (0.67 eV) on a Germanium substrate. The metallization includes silver on the front busbar and grid fingers, and silver with 500Ǻ gold on the back surface.
- Performance Tests: Conducted under various conditions including LIV at 50 W/cm² under ASTM 173G, with requirements of average efficiency (ηmp) greater than 38.5% and minimum efficiency greater than 36.2%. Temperature and intensity tests were performed at 50, 75, and 100 W/cm² at temperatures of 10°C, 25°C, 65°C, and 110°C.
- Weld Degradation: LIV tests before and after welding with a requirement of NPmp greater than 0.98.
- Spectral Response: Characterization using an angle of incidence with X25 or SR illumination source.
- Solar Absorptance: Reflectance measurement for characterization.
- Damp Heat: Conducted at 85°C and 85% RH for 2000 hours with a requirement of NPmp greater than 0.9.
- Thermal Cycle: Following IEEE 1513 standards with 500 cycles from –40°C to +110°C, requiring NPmp greater than 0.9.
- High Temp Soak in Nitrogen: Unbiased soak at 200°C and 250°C in Nitrogen, with NPmp greater than 0.95 after 25 years.
The document includes a typical population efficiency distribution graph and a spectral response chart. Full qualification reports are available upon request. The document is © 2010 Spectrolab, Inc., and specifications are subject to change without notice.
Catalog excerpts
CPV Small Aperture Point Focus Solar Cell C3MJ Third Generation CPV Technology Product Description Qualification Tests Completed Typical Efficiency 38.5% Recommended operating temperature <110°C Epitaxial Structure Triple junction solar cell on Germanium substrate GaInP (1.88 eV) / GaInAs (1.41 eV) / Ge (0.67 eV) Metallization Silver metallization on front busbar and grid fingers Silver metallization with 500Ǻ gold on back surface Test Conditions Performance Tests LIV 50 W/cm2 under ASTM 173G Temp 50, 75 & 100 W/cm2, Intensity ASTM 173G at 10°C, 25°C, 65°C, and 110°C Weld LIV test before and after Degradation weld 100% of NPmp > 0.98 scribed parts Spectral Response Angle of X25 or SR illumination incidence source Solar Measure reflectance Absorptance Accelerated Life Tests Damp Heat Thermal Cycle High Temp Soak in Nitrogen 85C, 85% RH for 2000 30 hours IEEE 1513 (500 cycles 25 –40°C to +110°C) unbiased soak at 200°C 15 at each and 250°C in Nitrogen T NPmp > 0.9 NPmp > 0.9 NPmp > 0.95 after 25 yrs * Full Qualification Report Is Available Upon Request Mechanical Dimensions © 2010 Spectrolab, Inc. All Rights Reserved (08/18/10) Specifications Subject to Change without Notice. Spectrolab, Inc. 12500 Gladstone Avenue, Sylmar, California 91342 USA ● Phone 818.365.4611 ● FAX: 818.361.5102 ● Website :
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Typical Performance Over Temperature Spectral Response Typical Population Efficiency Distribution Percentage of Population © 2010 Spectrolab, Inc. All Rights Reserved (08/18/10) Efficiency Specifications Subject to Change without Notice. Spectrolab, Inc. 12500 Gladstone Avenue, Sylmar, California 91342 USA ● Phone 818.365.4611 ● FAX: 818.361.5102 ● Website : www.spectrolab
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