ANGLE OF INCIDENCE CORRECTIONS FOR GaAs/Ge SOIAR CELLS WITH
Abstract:
A total of four different types of coverglasdfilter combinations were tested over a O to 85 degree angle of incidence range. One group of cells was irradiated to provide additional data, A predicted cell response was calculated using the cosine and Fresnel corrections. A co~nson of rrwasured versus predictwt values showed a good fit for blue refktkm or anti-reflection (AR) filters. Both blue-red and infrared reflection filtered cells showed decreased output in the 40 to 80 degree range due to nmvement of filter IR band-edge into cell response range. Perfornwnce at very high incidence angles is still not fully understcmd. A special infrared filter VKS used which did not have an angle of incidence effeci. Irradiation of cells had little or no effect on angle of incidence perfornwnce. lNTRoDucnoN The Jet Propulsion Laboratory Mars Pathfinder nksion has three different solar arrays each of which sees changes in inadence angle during norrmal operation. When solar array angle of incidence effects were researched, little published data was found [1-4]. The literature only documented the cosine and the Fresnel reflection corrections for angle of incidence but did mention other possible factors. MEASAT, a spinning spacecraft rmde by Hughes Space and Corrmunications Company (HSC), has the worlds first cwrmerdal spacecraft gallium arsenide on germanium solar array. This solar array uses infrared refltilon filters to lower army operating temperatures. Angle of incidence effects on the MEASAT were of interest and were measured at JPL, This data satisfied the needs of both the JPL and the Hughes spacecraft programs.
Citations
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| 1 | Solar Cell Optical Design Considerations – Opjorden |
| 1 | Arigl@f-incidence Effects on Module Power and Energy Performance,” Progress Report 21, A – Wlson, Ross - 1982 |
| 1 | he Large Area Pulsed Solar Sinulator – Mueller - 1994 |
| 1 | C@fica/ F?mperties of 7hin Solid Films,” [krtterworths Scientific – Heavens - 1955 |
