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Solar Cell Output and Light Sources
The output of solar cells differ depending on the categories of light sources to which they are exposed.
This is because photoelectric conversion efficiency changes with respect to the wavelength and intensity of the light.
1. Categories of light sources
The general light source for solar cells is sunlight out of doors, and fluorescent or incandescent light indoors.
The following outline describes the various categories:
Light source
Sunlight
Artificial light
AM-0
AM-1
AM-1.5
Other
Outer space (solar light at global average revolution orbit)
When the sun is directly overhead (0m above sea level at the equator,
vertical sunlight at meridian passage)
When zenithal angle
(Sunlight angle 0 ° when sun is directly overhead) is 48.2 ° .
AM-2 (when zenithal angle is 60 ° ), etc.
Incandescent light
Fluorescent light
Electric discharge lamp
General-use incandescent light, halogen lamp
Daylight, white, and warm white colors
Mercury-vapor lamp, sodium-vapor lamp, xenon lamp
2. Brightness
When sunlight and fluorescent light are compared in terms of brightness, the results are shown as follows:
[Light Source]
Sunlight
Fluorescent light
Condition
Direct sun
Bright
Illuminance (lux)
100,000 to 120,000
50,000 to 100,000
Condition
Design stand
(partially illuminated)
Office/conference room
Illuminance (lux)
Around 1,000
300 to 600
Cloudy
Rain
10,000 to
5,000 to
50,000
20,000
Restaurants/coffee shops
Below 200
3. Radiant spectrum of light source and spectral sensitivity of solar cells
1.0
0.9
0.8
0.7
0.6
Fluorescent light
(White color)
Sunlight spectral (AM-1.5)
0.5
0.4
0.3
0.2
0.1
Human eye
spectral sensitivity
a-Si solar cells
c-Si solar cells
1.0
0.8
0.6
0.4
0.2
0
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
Wave length [ μ m]
11
12
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