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Table 1 Dark, photocurrent and their ratios as a function of background oxygen pressure

From: Persistent Photoconductivity Studies in Nanostructured ZnO UV Sensors

O2Pressure (Torr) I Dark(A) I UV(A) I UV/I Dark
7.6 × 102 1.5 × 10−8 1.3 × 10−7 8.6
4 × 10−1 1.0 × 10−7 8.2 × 10−7 8.2
8 × 10−2 8.2 × 10−8 2.8 × 10−6 34