Table 4. Water Contact Angle and Surface Energy of PDIH, PDIC, PDIN, and Active Layer.
| structure | contact angle (deg) | surface energy (mN m–1) |
|---|---|---|
| ITO | 75.5 | 40.40 |
| ITO/ZnO | 77 | 34.33 |
| ITO/PDIH | 81.5 | 30.10 |
| ITO/PDIC | 92.3 | 29.96 |
| ITO/PDIN | 92.5 | 35.23 |
| ITO/P3HT:PC71BM | 98 | 23.43 |
| ITO/P3HT:PC71BM:PDIH | 99 | 22.05 |
| ITO/P3HT:PC71BM:PDIC | 103 | 23.17 |