With high precision laser cut cells, the current flowing in each bus bar is halved resulting in lower electrical resistance and an increased overall efficiency of about 2.5%.
Half cell module produces energy even if part of the module is shaded. Whereas if standard full cell module is partially shaded minimum one string will completely stop producing power, this accounts to one third reduction in power generation. Moreover, it can even completely stop generating power if shaded across its breadth. Half-cut cell module is split into two parts. Each section containing half cells generates power on standalone basis but combines again before current exits the module. This structure results in power generation in non-shaded area of the module even in one of the section is partially or completely shaded, resulting in higher overall energy yield as compared to standard module. The combination of half-cut cell technology and bifacial module can amplify the gain over the effect of current-reduction.
Half-cut cells have half of the working current, thereby the thermal loss is remarkably reduced. Operating temperature correspondingly decreases, and the reliability of module is improved as well as power gain.
Hotspots are a major source of failure for photovoltaic modules in the field. Small area shadings can drastically increase the temperature of shaded area. This phenomena is called hot spot. The prolonged hot spot could bring irreversible damage and degradation of modules. As the string current of half-cut cell modules is half of full-cell modules, the hot spot temperature decreases with reduced heat dissipation. Half-cell module design could mitigate hotspot degradation resulting in increased reliability of solar module. Result’s show the maximum hotspot cell temperature of the shaded half-cell module is 20 °C lower than that of the full-cell module .
Bifacial half-cell technology offer more power per square meter, helps to achieve the lowest LCOE in regions which is rich in sun radiation resources. Results and studies have shown that bifacial modules can produce additional power between 10-20% over monofacial panels. If conditions are optimized and single axis trackers adopted, the additional power can be as high as 30-40%.
Higher efficiency is achieved with latest PERC (Passivated Emitter and Rear Cell / Contact ) technology which captures more wavelengths of light through mirror like reflector behind the solar cell.
Bifacial solar cells utilize the sunlight more efficiently since they are able to convert light incident on both sides of the cell. he Al back surface field is replaced by Al grid.
Higher yields with low radiation intensity, low power-temperature coefficient, low operating temperature, all these technologies lead to a high energy yield.
Upto 23% Cell Efficiency
1st Year Degradation,
TOPCON (Tunnel Oxide Passivated Contact) solar cell, is the next generation of solar cell technology after PERC.
With the addition of the tunnel oxide layer, results show an increase of ~1% in absolute solar cell efficiency.
The ultrathin SiO2 acts as surface passivation layer between the rear Si surface and the rear “contact” – the poly-Si layer. The poly-Si layer is highly doped to produce a high conductivity layer which acts as a contact for current collection. Additionally, in a n-type TOPCON, the poly-Si layer is typically doped with phosphorus to provide field passivation (back surface field). This is similar to the phosphorus doped rear surface of n-PERC as shown in figure .