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Why hʋ is greater than energy gap in some material and µe usually greater than µh...

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Physics

Why hʋ is greater than energy gap in some material and µeusually greater than µh (µe is electron mobility , µh mobility ofholes)?

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photon energy is higher than the energy gaps of a semiconductormaterial when the material achieved High absorptioncoefficientIt was observed that SnSe thin films of thickness 148 nm hadthe highest absorption coefficient while thin films with    See Answer
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