We have employed Ag nanoparticles with calibrated size as catalysts to modulate the surface texture of single-crystalline Si surfaces for reducing sunlight reflectivity. Both experiments and theoretical analysis have proved that a well-organized microporous structure on the pyramids can be obtained by optimizing the size of Ag nanoparticles and the texturing time, and the Si wafer with such structures can effectively reduce the reflectivity of sunlight. However, based on the conventional cell fabrication process, the performance of silicon solar cells with such microporous structures gets degraded. It is closely associated with the strong surface recombination and the high phosphorus diffusion barrier induced by the microporous textures. These results are interesting for us to understand the application of nanotechnology on the silicon solar cell.
"This results in low-conversion efficiency. Conventional method to solve this problem is either to deposit an antireflection layer  or to texture the surface . Recently, it was found that reflectivity of the 1-D Si nanowires (SiNWs) was low due to the effect of light trapping . "
[Show abstract][Hide abstract] ABSTRACT: This study reports the preparation of Si nanowires (SiNWs) by selective electroless etching and fabrication of photovoltaic (PV) cells. It was found that the SiNWs with 3 μm average length and 100 nm average diameter were formed only in the areas not covered by the Cr electrodes. It was also found that average reflectance in the 400-1000 nm wavelength range reduced from 35% to around 2% with the SiNWs. Furthermore, it was found that we could enhance the short-circuit current density of the PV cells from 11.5 to 21.8 mA/cm2 and enhance conversion efficiency of the PV cells from 4.62% to 8.15% using the selective electroless etching.
[Show abstract][Hide abstract] ABSTRACT: Using tea polyphenols (TPs) as a reductant, Ag nanoparticles (AgNPs) supported on halloysite nanotubes (HNTs) were simply and greenly synthesized for the photocatalytic decomposition of methylene blue (MB). HNTs were initially functionalized by N-β-aminoethyl-γ-aminopropyl trimethoxysilane (AEAPTMS) to introduce amino groups to form N-HNTs to fasten the AgNPs; then AgNPs were synthesized and ‘anchored’ on the surface of the HNTs. Fourier transform infrared spectroscopy was employed to testify the amino groups on the surface of the HNTs. Transmission electron microscopy, field-emission scanning electron microscopy and x-ray diffraction were utilized to characterize the structure and morphology of the synthesized HNTs supported by the AgNPs (AgNPs@N-HNTs). The results showed that the AgNPs had been synthesized and ‘anchored’ onto the surface of the HNTs with a diameter of about 20–30 nm. X-ray photoelectron spectroscopy analysis revealed the chelating interaction between the AgNPs and N atoms together with the TP molecular. The photocatalytic activity of the as-prepared AgNPs@N-HNTs catalyst was evaluated by decomposition of MB; the results showed that the prepared catalyst exhibited excellent catalytic activity and high adsorption capability to MB.
Journal of Physics D Applied Physics 08/2012; 45(32). DOI:10.1088/0022-3727/45/32/325302 · 2.72 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: A simple process for nanotexturing on the emitter of silicon solar cells using catalyzed wet chemical etching by size-controlled silver nanoparticles was reported. A fine textured black surface was achieved to realize the low light reflectivity less than 5%. After screen printing and firing by the industrial standard fabrication protocol, we obtained the nanotextured Si solar cells with 15.7%-efficiency without any additional antireflection (AR) coating. This result suggests that the inexpensive metal-assisted wet chemical nanotexture method is prospective to be used in photovoltaic industry.
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