Due to the band gap of materials, the utilization of solar energy in photovoltaic power generation is limited. Therefore, a photovoltaic thermoelectric hybrid system is proposed to utilize solar energy in the all-optical spectrum of am1.5g. On this basis, a new GaAs solar cell design is proposed for full spectrum absorption in the cell structure. The cell structure is composed of ultra-thin GaAs layer with nano cone on the surface and nano grid azo Ag back contact. The finite difference time domain method is used to analyze the full spectral absorption characteristics of TE and TM polarization at incident angles from 0 ° to 60 °. The designed structure shows high absorption in all-optical spectrum. For GaAs layer, it shows that due to the anti reflection characteristics of nano cone array, the available solar energy of GaAs solar cell at 300-900 nm is almost completely absorbed by GaAs. At longer wavelengths of more than 900 nm, the energy absorbed in the back contact is due to Fabry Perot and local plasma resonance. The structure can effectively collect full spectrum incident photons in GaAs solar cells for the application of photovoltaic thermoelectric hybrid system.
GaInP/ GaInAs/ Ge triple junction concentrator solar cells, this paper reviews the work carried out within the frame of the EC funded design fullspectrum, which aims to ameliorate the CPV conversion effectiveness. The chassis mismatch structure achieves an effectiveness of further than 35 at 600 solar attention position. These cells are now ready to enter the terrestrial photovoltaic request. The prospects and challenges related to the request preface of these batteries are answered. The specific problems of trustability and characteristics on wafer are bandied. A new characterization tool mapcon is developed and demonstrated.
Because of the dispersion of light passing through the lens and the non parallel incidence of light, the position of Fresnel focus behind the lens, the distribution of light and the size of light spot are different. Then, we simulated the photoelectric performance of three junction battery. It is found that at the focal plane of the lens, due to the different illuminance distribution of the three bands, there is a current mismatch between the sub cells of the three junction battery, resulting in the reduction of the short-circuit current. Moreover, due to the greater nonuniformity of illumination at the focal plane of the lens, the filling factor of the unit will be reduced. Therefore, the short-circuit current, maximum output power and filling factor of the triple junction cell have a minimum value at the focus of the Fresnel lens and a maximum value on both sides of the focus. The output power on both sides of the focus is more than 15% higher than that of the focal plane. The simulation results are verified by the experimental results.