GaAs solar cell is the most efficient single junction photovoltaic technology. Their wide band gap enables them to effectively convert indoor light.confrontation with GaAs solar cells and traditional dye-sensitized GaAs solar cells for indoor light harvesting.Allowing them to be used with the power regulation circuit (MPPT tracking) based on the fractional voltage method.
Light source is the key part of indoor light energy collection system. Various types of light sources are used as illuminants in rooms. Among them, LED bulb, cold cathode fluorescent lamp (CCFL) bulb, halogen bulb and incandescent bulb are the most commonly used light sources in indoor environment. Interestingly, the above artificial light sources have different types of irradiation spectra.The irradiation spectrum of fluorescent tube light has peaks at ~ 400 nm and ~ 600 nm, while the irradiation spectrum of white LED light has peaks at ~ 450 nm and ~ 550 nm. In contrast, the irradiance spectra of halogen and incandescent bulbs show a gradual increasing trend in the wavelength range of 300-900 nm. In addition, the wavelength distribution of light generated by different light sources is also different. Compared with fluorescent lamps, LED light sources have wider and more continuous energy distribution. In addition, the quality of light produced by various light sources is also different (these light sources produce light with different irradiation power intensity under the same brightness value). Variation of irradiation power intensity (measured in the wavelength range of 300-900 nm) of different light sources at specific brightness values. It can be observed that the irradiation power intensity of LED 3200 K lamp at 200 LX brightness is 96.4 µ w / cm2, while the irradiation power intensity of LED 5600 K bulb and CCFL bulb is 91.60 µ w / cm2 and 71.49 µ w / cm2, at the same brightness level.