Solar cells are often coated with a transparent, thin film of silicon monoxide (n = 1.45) to minimize reflective losses from the surface. Suppose a silicon solar cell (n= 3.5) is coated with a thin film of silicon monoxide. Determine the minimum film thickness that produces the least reflection at a wavelength of 550 nm. ANS = 94.8 nm 180° phase change 180° phase change Air n = 1 SiO n = 1.45 Si n = 3.5 (a) Thomen ghe bdaten
Solar cells are often coated with a transparent, thin film of silicon monoxide (n = 1.45) to minimize reflective losses from the surface. Suppose a silicon solar cell (n= 3.5) is coated with a thin film of silicon monoxide. Determine the minimum film thickness that produces the least reflection at a wavelength of 550 nm. ANS = 94.8 nm 180° phase change 180° phase change Air n = 1 SiO n = 1.45 Si n = 3.5 (a) Thomen ghe bdaten
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Transcribed Image Text:Solar cells are often coated with a transparent, thin film of silicon monoxide (n = 1.45) to
minimize reflective losses from the surface. Suppose a silicon solar cell (n= 3.5) is
coated with a thin film of silicon monoxide. Determine the minimum film thickness that
produces the least reflection at a wavelength of 550 nm.
ANS = 94.8 nm
180° phase
change 180° phase
change
Air
n = 1
SiO
n = 1.45
Si
n = 3.5
(a)
Thomen ghe bdaten
Expert Solution
Step 1
Condition for minimum intensity is given by
2nd= (m+1/2) λ
Where d is the Thickness of metal film
λ is the wavelength =550 nm
m is the order
n is the refractive index of film =1.45
For minimum thickness d, m=0
d= λ/4n
550/ 4*1.45
94.8 nm
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