- Maxwell is betting on light conversion film to improve power output of HJT solar modules by more than 5W
- In a field experiment, it has been able to achieve ultraviolet light conversion into blue light at a wavelength of around 450mm for HJT technology using the film
- The company now wants the industry to jointly advance this technology to aim for 10W output gain for HJT modules
Chinese solar cell production equipment supplier Suzhou Maxwell Technologies says it is possible to increase the output of a 60-cell M6 heterojunction (HJT) solar module by more than 5W as it figured with the help of a light conversion film from Cybrid Technologies Inc.
It now wants industry players to jointly advance HJT technology to optimize light conversion materials and dispersion process for the materials in packaging films so that such a combination has power 1% more than a highly permeable film, aiming for a relative gain of 10W for the module.
An industry led effort should also target optimizing weather resistance of light conversion films and ensure that such HJT modules pass the 3-fold IEC test and keep the effectiveness of light conversion materials in the acceleration test, according to Maxwell’s recommendations.
At present, explains Maxwell, the current of HJT solar cells is lower than ordinary ones due the use of TCO film and amorphous silicon film that absorb ultraviolet rays.
Photoelectric conversion films can help deal with this shortcoming as these can absorb ultraviolet light and convert it into visible light with 100% responsivity. This leads to higher current for solar cells and increased output for modules. Converted photons have no negative impact on the interface passivation of HJT products either.
Using Cybrid’s light conversion film for more than a month in a field experiment, the Chinese manufacturer was able to report ultraviolet light conversion into blue light at a wavelength of around 450mm for HJT technology.
“Comparing the HJT module with the benchmark module, the R&D team has found that the ultraviolet spectral response of HJT solar cells of the former is substantially enhanced to more than 60%,” reads a statement from Maxwell. “According to the spectral integral method, if the spectral response could be fully transformed into module power, the power would increase by 0.8% to 1%.”
An overview on encapsulation products can be found in TaiyangNews Market Survey on Solar Backsheets and Encapsulation 2021, which can be accessed here.