Which Parameters Determine the Low-Light Behaviour of CIGSSe-Based Thin-Film Solar Cells?

The performance of solar cells in realistic operating conditions usually differs from the specified efficiency at standard test (STC). Among other factors, illumination intensity (irradiance) is often lower than STC, which leads to a device efficiency. Therefore, it becomes important optimize output power low-light order achieve high energy yield specific location. For this purpose, essential have detailed knowledge relevant parameters that govern behaviour. This study investigates impact diode on thin-film based chalcopyrite Cu(In,Ga)(S,Se) 2 absorbers. Experimental irradiance-dependent current-voltage results are analysed with help an analytical model. each parameter contributions its absolute value and irradiance dependence assessed. Additionally, relations between material examined by analysing different cell variations. show primarily governed fill factor, turn mainly determined parallel resistance device. Moreover, reduction dark saturation current ideality factor towards irradiances observed indicates change recombination dynamics. consequence increase open-circuit voltage indirectly also boosts factor. suggest optimization for should focus improving tuning way decreases decreasing irradiance.