Figure 4From: Current-voltage characteristics in macroporous silicon/SiOx/SnO2:F heterojunctionsModel of PS/Ox/FTO heterojunction. Proposed equivalent circuit (a). Two opposite diodes with photocurrent sources are connected in parallel to another diode. Parallel and series resistance are also included. Schematics of PS/Ox/FTO heterojunction and the interfaces associated to each diode in the equivalent circuit (b).Back to article page