| Sample | i0 (m∙A∙cm−2) | b (m∙V∙dec−1) |
| GDE1 | 4.9 × 10−5 | 114 |
| GDE2 | 5.5 × 10−5 | 112 |
| GDE3 | 3.02 × 10−4 | 91 |
| GDE4 | 8.1 × 10−5 | 105 |
| GDE5 | 9.8 × 10−5 | 107 |
| GDE6 | 3.00 × 10−4 | 93 |
| GDE7 | 2.80 × 10−5 | 101 |
| GDE8 | 2.60 × 10−5 | 103 |
| GDE9 | 4.00 × 10−5 | 100 |