We investigated the transport and photovoltaic properties of Cu(In 1-xGa x)Se 2 (CIGS) thin-film solar cells. The shunt-current-eliminated diode current could be obtained from the current-voltage characteristics by subtracting the parasitic shunt leakage current from the total current. The temperature dependence of the open-circuit voltage, extracted from the shunt-eliminated (total) current, suggested that the recombination activation energy is comparable to (much less than) the CIGS bandgap. The low-temperature characteristics of the diode ideality factor supported bulk-dominated recombination in the same cell. This suggests that shunt-current subtraction can provide the proper diode parameters of CIGS solar cells.
- CIGS thin film
- Open-circuit voltage
- Recombination activation energy
- Shunt current
- Solar cells