A regular rippled pattern formed by the molecular self-organization of polyvinylpyrrolidone encapsulated Ag nanoparticles: a high transmissive coating for efficiency enhancement of c-Si solar cells

Abstract

The formation, characterization and application of polyvinylpyrrolidone (PVP) encapsulated silver nanoparticles with regular rippled pattern is reported. The metal precursor was reduced by an in-situ reduction technique, where organic and mild reducing agent glucose was used to have control over the process. In order to have a rippled structured of the film by molecular self organization of the encapsulated Ag nanoparticles, an optimization of the concentrations of the reactants has been done. The structural properties of the deposited films were established by X-Ray diffraction, transmission electron microscopy, atomic force microscopy and dynamic light scattering techniques. Atomic force microscopy (AFM) revealed highly ordered ripple structure of the film originated due to self organization of the Ag nanoparticles in the PVP matrix, whereas, Transmission electron microscopy (TEM) revealed core-shell structure of the Ag/PVP unit. UV-Vis spectrophotometric analysis resulted in a broad absorption peak within 350 to 500 nm (centered at 418 nm), characteristic for Ag nanoparticles.Notable lowering in reflectance and increase in transmittance, leading to an enhancement in overall efficiency were observed when such rippled pattern was spin coated on a c-Si solar cell.

PVP‐Capped Gold Nanoparticles: Thermal Nonlinear Refraction Probed by Spatial Self‐Phase Modulation

“…Measurements made with an aqueous solution of PVP and an aqueous solution of citrate at the concentrations used to cap the AuNPs did not show any SSPM pattern within the used power range (results not shown). The absence of a SSPM pattern is due to the negligible optical absorbance of PVP [ 45 ] and citrate. [ 46 ] It is also possible to see that with increasing power, the pattern becomes D‐shaped due to the hydrodynamic effect.…”

Biological synthesis of hybrid silver nanoparticles by Periploca aphylla Dcne. From nanotechnology to biotechnology applications

“…The aggregation of the PEGMA-capped Pe-AgNPs is responsible for the rise in amplitude at 295 nm and the concomitant drop in peak intensity at 50 nm. The agglomerated component has a diameter of approximately 347 nm, whereas the unagglomerated counterpart has a diameter of around 50 nm ( Banerjee, et al, 2015 ).…”

Gold Nanoparticles: A Didactic Step-by-Step of the Synthesis Using the Turkevich Method, Mechanisms, and Characterizations

“…Hence, according to DLS, synthesized AuNPs are ultra-small nanoparticles [62][63][64]. In addition, only one peak was observed in the graph, indicating that there were no particles of very different sizes in the colloid [65].…”

“…High potentials (negative or positive) are electrically stabilized; generally, repulsive forces exceed attractive forces, resulting in a stable system. Low potentials tend to coagulate or flocculate [65,73]. Usually, particles with ZP in the range of −30 mV to +30 mV are considered to be normally stable [66].…”