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In solar cells, a silicon solar cell (mu...

In solar cells, a silicon solar cell `(mu = 3.5)` is coated with a thin film
of silicon monoxide `SiO (mu = 1.45)` to minimize reflective losses from the surface.
Determine the minimum thickness of SiO that produces the least reflection at a
wavelength of 550nm, near the centre of the visible spectrum. Assume
approximately normal incidence .

Text Solution

Verified by Experts

The reflected light is minimum when rays 1 and 2 (shown in figrue) meet the condition of destructive interference.
`2t = (lambda)/(2mu)`
or `t = (lambda)/(4 mu) = 94.8 nm`
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