Figure 6

J-V curves obtained under the condition of dark and AM 1.5 for three kinds of devices with Au electrode: (a) ZnO-CuI p-n junction, (b) ZnO-FeS2 junction, (c) ZnO-FeS2-CuI p-i-n junction. The insets of them are corresponding magnified J-V curve in semi-logarithmic scale near zero bias voltage. (d) Time-dependent photoresponse of ZnO-FeS2-CuI p-i-n photodiode under dark and AM 1.5 condition.