Second Generation Detectors With Substrate Removed

The substrate removal process has been carried out by RSC on two early WFC3 detectors. Radiation tests made at U.C. Davis have demonstrated that with these devices the extra background is now undetectable, with upper limits approximately three orders of magnitude lower than the previous substrate-induced background levels. Scaled to the orbital environment, these limits correspond to a negligible level of background signal compared with the intrinsic dark current of the devices. Two new lots of detectors have since been produced, and recent measurements at the GSFC Detector Characterization Laboratory confirm the expected increase of QE at shorter wavelengths (Fig.3).

Figure 3. Comparison of the GSFC/DCL measured quantum efficiency of the current flight detector FPA#64 with a number of second generation, substrate removed, WFC3-IR FPAs. From top to bottom: FPA#104, FPA#102, FPA#105, FPA#106 (all substrate removed), FPA#107 (incomplete substrate removal), FPA#64. Detector gain was measured with photon transfer mode.

Figure 3. Comparison of the GSFC/DCL measured quantum efficiency of the current flight detector FPA#64 with a number of second generation, substrate removed, WFC3-IR FPAs. From top to bottom: FPA#104, FPA#102, FPA#105, FPA#106 (all substrate removed), FPA#107 (incomplete substrate removal), FPA#64. Detector gain was measured with photon transfer mode.

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