Differences of silicon photodiode spectral reflectance among the same batch

Abstract

Photodiode’s reflectance plays an important role regarding the relation between responsivity and the incident flux. In this work we analyze how the spectral reflectance changes among photodiodes from the same manufacturer and batch and how the reflectance of three standard photodiodes has drifted during six years. The results show that the reflectance changes from diode to diode within the same batch and also show that the reflectance of photodiodes changes on time. This ageing is spectrally dependent.

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