Table 1.
Summary of crystal size, determined with XRD, normalized elemental composition (Cu:S for SEM, Cu:In:S for STEM measurements) and band gap of the CuInS2 films synthesized with l-cysteine for different reaction times at 150 °C. Values of film_3 h are not included in the average value in the last line.
| Crystal Size XRD (nm) | EDX SEM Cu:S (Normalized) | EDX TEM Cu:In:S (Normalized) | Band Gap UV-vis (eV) | |
|---|---|---|---|---|
| film_3 h | 39 ± 4 | --- | Cu:Cl 1.0:0.8 Cu:In:S 1.0:0.1:0.2 |
1.55 |
| film_6 h | 6.6 ± 1.4 | 1.0:1.3 | --- | 1.54 |
| film_9 h | 11.0 ± 0.6 | 1.0:1.6 | --- | 1.46 |
| film_12 h | 7.9 ± 1.0 | 1.0:2.1 | --- | 1.54 |
| film_15 h | 8.5 ± 0.6 | 1.0:2.4 | --- | 1.50 |
| film_S [32] | 9.4 ± 1.0 | 1.0:2.5 | 1.0:1.0:2.1 | 1.47 |
| film_21 h | 8.9 ± 1.0 | 1.0:2.3 | --- | 1.51 |
| film_24 h | 11.0 ± 0.5 | 1.0:1.7 | --- | 1.53 |
| film_48 h | 8.7 ± 1.0 | 1.0:1.9 | 1.0:1.0:2.2 | 1.44 |
| Ø | 9.0 ± 1.0 | 1.0:2.0 ± 0.4 | --- | 1.50 ± 0.04 |