Table 1. Z Fit Analysis of the Nyquist Plot.
| equivalent
circuit: R1 + C1/R2 + Q3 |
||||
|---|---|---|---|---|
| parameter | Cu2FeSnS4 | Cu2FeSnS4/PVP | Cu2FeSnS4/PVP/rGO | unit |
| R1 = Rs | 0.9016 | 0.8728 | 0.6237 | Ohm |
| C1 | 0.0294 | 0.4135 × 10–3 | 2.021 × 10–3 | F |
| R2 = Rct | 2.16 | 2.73 | 3.77 | Ohm |
| Q3 | 0.0408 | 0.047 | 0.02633 | F·s(a–1) |
| a3 | 0.4447 | 0.486 | 0.5313 | |