The solar cells are reaching the end of their useful life after a life span of about 20-30 years; some of the early solar cells are no longer usable. There is the problem of large amounts of solar cell waste. B-Si has the advantage of not requiring a p-n junction, and it has been shown that textured structures on the surface of solar cells can improve the light absorption efficiency. Old Si solar cells can be utilised as photothermal absorbers in a new way otherwise needing disposal. This way of Si cell reuse reduce waste.