| Similarity | Rank | |
|---|---|---|
| photovoltaic | 0.945 | 22415 |
| thin-film | 0.875 | 77599 |
| solar | 0.859 | 2460 |
| Photovoltaic | 0.852 | 65567 |
| PV | 0.819 | 14682 |
| renewable | 0.813 | 6153 |
| cogeneration | 0.784 | 76666 |
| GaN | 0.774 | 98946 |
| renewables | 0.771 | 27442 |
| high-efficiency | 0.751 | 53165 |
| semiconductors | 0.750 | 51843 |
| light-emitting | 0.750 | 81527 |
| energy-efficient | 0.749 | 24948 |
| SunPower | 0.741 | 93594 |
| geothermal | 0.740 | 21905 |
| energy-saving | 0.739 | 35516 |
| semiconductor | 0.737 | 23279 |
| thermoelectric | 0.735 | 94917 |
| off-grid | 0.729 | 64101 |
| polysilicon | 0.729 | 99165 |
| energy-efficiency | 0.723 | 70696 |
| electricity | 0.722 | 3160 |
| CSP | 0.721 | 35309 |
| bioenergy | 0.721 | 65798 |
| biofuels | 0.720 | 26111 |