Expanding Thermal Plasma Chemical Vapour Deposition of ZnO:Al Layers for CIGS Solar Cells
Dark curves of CIGS samples with the ZnO:Al layer deposited under (a) low thermal budget and (b) high thermal budget conditions for different ZnO:Al thicknesses in each case (thickness values are indicated on each curve). The response from the reference cell is also included. (c) A comparison of the dark response for low thermal budget ( nm), high thermal budget ( nm), and reference samples. Bold arrows in (a)–(c) indicate the increased leakage current with increased thermal budget. (d) Ideality factor as a function of voltage, calculated for the curves shown in (c) using the ideal diode equation.
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