Chien-Wu Yeh

Light trapping of plasmonics textured silicon solar cells based on broadband light scattering and wide acceptance angle of indium nanoparticles

In this study, light trapping of textured silicon solar cell based on light scattering and angle of incident light of plasmonics indium nanoparticles (In NPs) of various dimensions is demonstrated. The light trapping modes of textured surface with and without In NPs for incident angles of 0°, 35.3°, and 54.7° are proposed and characterized. The optical reflectance, external quantum efficiency and photovoltaic performance depended on the dimensions of plasmonics In NPs and angles of incident light are measured and compared.

Plasmonic Light Scattering in Textured Silicon Solar Cells with Indium Nanoparticles from Normal to Non-Normal Light Incidence

In this study, we sought to improve the light trapping of textured silicon solar cells using the plasmonic light scattering of indium nanoparticles (In NPs) of various dimensions. The light trapping modes of textured-silicon surfaces with and without In NPs were investigated at an angle of incidence (AOI) ranging from 0° to 75°. The optical reflectance, external quantum efficiency (EQE), and photovoltaic performance were first characterized under an AOI of 0°. We then compared the EQE and photovoltaic current density-voltage (J-V) as a function of AOI in textured silicon solar cells with and without In NPs. We observed a reduction in optical reflectance and an increase in EQE when the cells textured with pyramidal structures were coated with In NPs. We also observed an impressive increase in the average weighted external quantum efficiency (∆EQEw) and short-circuit current-density (∆Jsc) in cells with In NPs when illuminated under a higher AOI. The ∆EQEw values of cells with In NPs were 0.37% higher than those without In NPs under an AOI of 0°, and 3.48% higher under an AOI of 75°. The ∆Jsc values of cells with In NPs were 0.50% higher than those without In NPs under an AOI of 0°, and 4.57% higher under an AOI of 75°. The application of In NPs clearly improved the light trapping effects. This can be attributed to the effects of plasmonic light-scattering over the entire wavelength range as well as an expanded angle of incident light.

External quantum efficiency and photovoltaic performance of silicon cells deposited with aluminum, indium, and silver nanoparticles

In this study, the plasmonic light scattering of aluminum (Al), indium (In), and sliver (Ag) nanoparticles (NPs) deposited on silicon solar cells was demonstrated. For comparison, the dimensions of all NPs were maintained at 17–25 nm with a coverage of approximately 30–40% through the control of film deposition and thermal annealing conditions. Absorbance and surface plasmon Raman scattering were used to examine the different localized surface plasmon resonances (LSPRs) of the proposed NPs. Optical reflectance, external quantum efficiency (EQE) response, and photovoltaic current density–voltage characteristics under AM 1.5G illumination were used to confirm the contribution of the plasmonic light scattering of the NPs. The conversion efficiencies of the solar cells with Al, In, and Ag NPs increased 1.21-, 1.23-, and 1.17-fold, respectively, compared with that of the reference bare Si solar cell. The EQE response and photovoltaic performance revealed that Al and In NPs produced broadband plasmonic light scattering and increased efficiency, far exceeding the results obtained using Ag NPs.

Electrical and optical characterization of crystalline-si solar cell with down shifting eu-doped silicate phosphors film depending on the coverage of phosphors particles using spin-on film process

Electrical and optical performance of crystalline silicon solar cells with down shifting Eu-doped silicate phosphors film using spin-on film technique was experimental demonstrated. The coverage of phosphors particles was controlled using the deposition holding time by spin-on process. Photo-luminescence (PL) and external quantum efficiency (EQE) response of the cells with Eu-doped silicate phosphors are used to examine the effectiveness of the phosphors down shifting. An impressive enhanced in conversion efficiency of 19.7% was obtained when the cell with a 5 wt% Eu-doped silicate phosphors mixing with SiO2 solution for a 5 s deposition holding time.

EQE response and photovoltaic performance of plasmonic silicon solar cells based on depositing with aluminum, indium, and silver nanoparticles

This study experimental demonstrated the plasmonic effects of Al-, In-, and Ag-nanoparticles (NPs) depositing on the silicon solar cells, respectively, according to external quantum efficiency and photovoltaic current-voltage. Efficiency enhancement of 22.68%, 20.88% and 17.10% for the cell with In-, Al- and Ag-NPs was obtained, compared to the reference cell.

Simulation and demonstration of MOS-structure silicon solar cell using ITO/Al 2 O 3 /TiO 2 antireflective coating

Performance enhancement of the p-n junction silicon solar cells with ITO/Al₂O₃/TiO₂ antireflective coating is experimentally demonstrated. The reflectivity of the ITO/Al₂O₃/TiO₂ layer configuration with various thicknesses on Si wafer are simulated and characterized. Optical reflection and external quantum efficiency of the proposed MOS-structure Si solar cells are measured and compared with the changing in oxide-film thickness. An impressive efficiency enhancement of 42.39 % was obtained for the cell consisted of a 50-nm-ITO/5-nm-Al₂O₃/25-nm-TiO₂ antireflection coating, compared to the reference cells.

Fabrication and optical characterization of ultra-thin anodic aluminum oxide nanoporous templates

In this study, the fabrication of thin porous anodic aluminum oxide (AAO) templates with controllable thickness of 400-1300 nm is demonstrated. One-step anodizing method is used to generate AAO template with hexagonal porous distributed profile. The pore diameter pore-widening and AAO barrier layer thinned down are investigated. The morphologies and pore structures of the fabricated AAO templates are characterized using FE-SEM images and the transmittance and reflective spectra.