Improved performance and spectral features of complex porous silicon structure containing silicon solar cells

Abstract

This work presents porous silicon technology, adapted to improve the characteristics of monocrystalline silicon solar cell. This is achieved by taking advantage of properties provided by porous silicon technology in production of diverse structures in the material. We produce a porous silicon derivative, which is mostly hidden in the emitter of solar cell. Research of the initial and modi ed solar cells was made by measuring current voltage characteristics under illumination of a 5000 K xenon lamp. Spectrally resolved studies of current voltage characteristics were carried out using radiation of halogen lamps and di raction grating monochromator. Studies revealed that the manufacturing of buried porous silicon structure improves solar cell performance by increasing the ll factor of the modi ed solar cell current voltage characteristics, maximum output power and e ciency, when compared to unmodi ed ones. Spectral studies revealed that the above-mentioned improvement di ers for various sections of light spectrum. Largest relative enhancement of solar cell current was observed at the wavelengths of Δ = 450 550 nm. We consider the cumulative result of several effects resulting in solar cell e ciency enhancement. Most of them were the in uence of porosity on e ective optical path length and better antire ecting properties of multiple porous structures.