Non-uniform integrated Cu(In,Ga)Se2 solar cell efficiency SPICE simulation

• Thin-film CIGS devices were prepared on the soda-lime glass substrate.
• CIGS I–V measurement data are fitted by a single diode model for SPICE simulation.
• Large-size non-uniform CIGS integrated module was ran by SPICE and found key SPICE parameter for maximum power.

Maximum power estimation of a single CIGS solar cell is very difficult in a large-scale non-uniform CIGS module. A distributed network SPICE model for CIGS modules is presented that predicts the impact of non-uniformity on the module performance. Maximum power is affected less by a local bad area but is seriously affected by an entire bad single cell. Results indicate that very locally formed good or bad area did not affect maximum power for a large-scale CIGS module. The proposed network SPICE model is able to not only predict module performance but also to help the improvement of the CIGS device parameter during the thin-film CIGS process.

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