22.4 Solar Cells
631
(c)
incident
reflected
(d)
0.6
0.4
0.2
0
0.3
0.5
0.7
0.9
1.1
Reflectivity
(a)
(b)
Fig. 22.61 a SEM image of topology of acidically etched multi-crystalline silicon wafer. b SEM image of alkaline
etched mono-crystalline silicon wafer. c Exemplary light path. d Reflectance of antireflection-coated flat (dashed line)
and textured (solid line) surface). Parts a and b adapted from [1888], part d adapted from [1889]
(c)
1.0
0.8
0.6
0.4
0.2
0.0
8 9 10 11 12 13 14 15 16
(a)
(b)
Fig. 22.62 Annual average solar energy (in kWh/(m 2 day)) for a an optimally tilted south-facing fixed panel and b an
optimally two-axis tracked panel (in mainland US). Adapted from [1890]. c Power generation of a solar cell vs. time (in
daytime hours) for a stationary setup facing the sun at constant angle (solid line) and mounting with tracking (dashed
line) to optimize the angle towards the sun. Adapted from [1891]
631
(c)
incident
reflected
(d)
0.6
0.4
0.2
0
0.3
0.5
0.7
0.9
1.1
Reflectivity
(a)
(b)
Fig. 22.61 a SEM image of topology of acidically etched multi-crystalline silicon wafer. b SEM image of alkaline
etched mono-crystalline silicon wafer. c Exemplary light path. d Reflectance of antireflection-coated flat (dashed line)
and textured (solid line) surface). Parts a and b adapted from [1888], part d adapted from [1889]
(c)
1.0
0.8
0.6
0.4
0.2
0.0
8 9 10 11 12 13 14 15 16
(a)
(b)
Fig. 22.62 Annual average solar energy (in kWh/(m 2 day)) for a an optimally tilted south-facing fixed panel and b an
optimally two-axis tracked panel (in mainland US). Adapted from [1890]. c Power generation of a solar cell vs. time (in
daytime hours) for a stationary setup facing the sun at constant angle (solid line) and mounting with tracking (dashed
line) to optimize the angle towards the sun. Adapted from [1891]