Products Description
HJT Cell Core Structure
Silicon Heterojunction Technology (HJT) is based on an emitter and back surface field (BSF) that are produced by low temperature growth of ultra-thin layers of amorphous silicon (a-Si:H) on both sides of very well cleaned monocrystalline silicon wafers, less than 200 μm in thickness, where electrons and holes are photogenerated.
HJT Cell Fabrication Process
The cells process is completed by the deposition of transparent conductive oxides that allow for an excellent metallization. The metallization can be done by a standard screen printing which is widely used in industry for the majority of cells or with innovative technologies.
HJT Technology Advantages
Heterojunction technology (HJT) silicon solar cells have attracted a lot of attention because they can achieve high conversion efficiencies, up to 25%, while using low temperature processing, typically below 250 °C for the complete process. Low processing temperature allows handling of silicon wafers of less than 100 μm thick while maintaining a high yield.
Process flow
Key features
High Eff and high Voc
Low temperature coefficient 5-8% power output gain
Bifacial structures
【Technical Data】
| TECHNICAL DATA AND DESIGN | TEMPERATURE COEFFICIENTS AND SOLDERABILITY | ||
|---|---|---|---|
| Dimension | 156.75mm*156.75mm±0.25 | TkUoc (%/K) | -0.27 |
| Thickness | 190±30 µm | TkIsc (%/K) | +0.05 |
| Front | 5 Busbars | TkPMAX (%/K) | -0.336 |
| Back | 5 Busbars | Peel Strength Minimum | >1.4N/mm |
| No. | Efficiency (%) | Pmpp (W) | Uoc (V) | Isc (A) | FF (%) |
|---|---|---|---|---|---|
| 1 | 23.50 | 5.74 | 0.743 | 9.6 | 80.53 |
| 2 | 23.40 | 5.72 | 0.741 | 9.592 | 80.43 |
| 3 | 23.30 | 5.70 | 0.74 | 9.585 | 80.33 |
| 4 | 23.20 | 5.67 | 0.738 | 9.577 | 80.24 |
| 5 | 23.10 | 5.65 | 0.737 | 9.57 | 80.14 |
| 6 | 23.0 | 5.63 | 0.735 | 9.562 | 80.04 |
| 7 | 22.90 | 5.60 | 0.733 | 9.554 | 79.94 |
| 8 | 22.80 | 5.58 | 0.732 | 9.547 | 79.84 |
| 9 | 22.70 | 5.55 | 0.73 | 9.539 | 79.75 |
| 10 | 22.60 | 5.53 | 0.729 | 9.532 | 79.65 |
| 11 | 22.50 | 5.51 | 0.727 | 9.524 | 79.55 |
| 12 | 22.40 | 5.48 | 0.725 | 9.516 | 79.45 |
| 13 | 22.30 | 5.46 | 0.724 | 9.509 | 79.36 |
| 14 | 22.20 | 5.44 | 0.722 | 9.501 | 79.26 |
| 15 | 22.10 | 5.41 | 0.721 | 9.494 | 79.16 |
| 16 | 22.00 | 5.39 | 0.719 | 9.486 | 79.06 |
| 17 | 21.90 | 5.37 | 0.717 | 9.479 | 78.97 |
| 18 | 21.80 | 5.35 | 0.716 | 9.471 | 78.87 |
| 19 | 21.70 | 5.32 | 0.714 | 9.463 | 78.77 |
| 20 | 21.60 | 5.30 | 0.712 | 9.456 | 78.67 |
| 21 | 21.50 | 5.28 | 0.711 | 9.448 | 78.57 |
Certificate
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