Let's compare themonocrystalline silicon solar cells with other photovoltaic technologies. From amorphous silicon to heterojunction photovoltaic modules.
THEmonocrystalline silicon modulesthey are composed of a single silicon crystal. In its pure state, the silicon atoms are perfectly aligned: it is thanks to this pure structure that they guarantee maximum conductivity. If, in the first instance, themonocrystalline silicon solar cellsthey managed to achieve yields of around 15%, today, with new technologies, the yield can exceed 21%.
When it comes to photovoltaic performance, efficiency does not translate "only" into greater electricity production. By improving efficiency, it is possible to reduce labor work, save in terms of structures, cables, occupied surface, design and installation. A victory for the investor and for the renewable energy sector.
Solar cells: monocrystalline or polycrystalline silicon
What is the difference between monocrystalline silicon and polycrystalline silicon solar cells?
Themonocrystalline silicon, thanks to its semiconductor properties, it is the basic material of the electronics industry. In the photovoltaic industry, themonocrystalline siliconis used in the making ofsolar cellsgood performance.
Solar cells are able to tolerate, within certain limits, small structural imperfections, which is why in the photovoltaic sector, each single crystal is often replaced by polycrystalline silicon. The polycrystalline silicon it is less expensive than monocrystalline. Given the major imperfections and the different properties, onepolycrystalline silicon solar cellsit has a lower energy efficiency than monocrystalline silicon photovoltaic cells.
Generally speaking, we can say that photovoltaic modules with technology alpolycrystalline silicon they offer an average efficiency of 16.7% while a monocrystalline silicon solar cell achieves average efficiencies of 21%. These are average values because there is no lack of isolated cases that constitute the excellence of the sector such as the high efficiency bison bifacial photovoltaic cell inmonocrystalline silicon which achieves a yield of 25%.
The polycrystalline silicon modules, also calledmulticrystalline photovoltaic modules, are given by a set of several silicon crystals. Even in this sector there is no lack of examples of excellence: the polycrystalline silicon solar cells more efficient, they reach an efficiency of 21%.
Silicon is used for the production ofsolar cellseven in its formallotropic. Let's talk about theamorphous siliconwhere the atoms form a disordered structure. This is why theamorphous silicon solar cellsthey are the least efficient with an average yield of 8.5%.
Monocrystalline silicon solar cells
In terms of performance, monocrystalline silicon is only surpassed by the technology pioneered byPanasonicwith high efficiency heterojunction modules. These modules achieve a record yield of 25.6%.
A similar performance is achieved withmonocrystalline siliconof bison bifacial solar cells. Made with 60 #bison double-sided cells, the modules are able to develop over 300 Wp on the front and 270 on the back which, considering an average contribution of 20% from the back, correspond to 375 We (Watt equivalent) overall (front + back) .
In terms of performance, the cells have an efficiency of over 21% on the front to be added to the performance of the back (this is the peculiarity of double-sided cells), with a bifaciality index of 90%. Considering a contribution from the back of the cell of 20%, the overall efficiency of these photovoltaic cells therefore reaches 25%. As stated, the high efficiency combined with the bifaciality of the solar cells, allows you to reduce the size of the plant for the same kWh (Kilowatt hour) produced with savings in terms of occupied surface, labor, cables, support structures, installation and design.