International Radiation Detectors, Inc.

Responsivity

Figure 1 shows a typical responsivity curve for a UVG-series photodiode with a 700 Å oxynitride window. The peaks and valleys above 160 nm are caused by the interaction of the complex index of refraction of silicon with the index of refraction and thickness of the oxynitride according to the standard interference relations of optics. The complexity of the responsivity (and external quantum efficiency spectrum) over the UV suggests that trap detectors made from UVG-series photodiodes would be useful for high accuracy applications.

Fig. 1: Typical responsivity of UVG-series photodiodes

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