Solar Cell Applications

August 28, 2019

Introduction

Solar Cell

Up-conversion Phosphors Measuring System

Generally, the emission wavelength are longer than the excitation wavelength, appearing towards the red end of the wavelength range. Up-conversion phosphors, however, are significant because the emission wavelength is shorter than the excitation wavelength shifting towards the blue wavelengths. Recently, up-conversion technique has attracted much attention in the field of research and development of solar cell materials.JASCO has developed the evaluation system using the FP-8600 with the dedicated accessory mount for a 980 nm NIR laser.  The figure shows the emission spectrum of the up-conversion phospor excited at 980 nm.  Several peaks were observed in the visible region. 

 

Emission Spectrum of Up-conversion Phosphor

Irradiation of 980 nm Laser Light to Up-conversion Phosphor

Human eyes cannot detect the light of the 980 nm laser, but while the up-conversion phosphor is illuminated with this laser, the irradiated sample area can be observed as a green spot. This phenomenon can be explained as the luminescence from the up-conversion phosphor when it was excited by the 980 nm laser which products emission in the visible range.

Up-conversion Phosphor Measuring System

Evaluation of Crystallinity of Si for Solar Cell

Si Peak Shift due to Crystallinity

The peak of monocrystal Silicon spectrum shifts to lower wavenumber side as crystallinity of Silicon becomes less with peak shape broader. Distribution of crystallinity was evaluated by peak position and half width in XY mapping measurement of surface of Polycrystalline Silicon.

        Raman Imaging Microscopy

Crystallinity Image of Polycrystalline Silicon on Glass Substrate

Complex Impurities on Silicon Wafer

Impurities on Silicon wafer were measured by high speed imaging and color coded image was created with peak height and PCA mapping analysis. Complex impurities including Protein, Cellulose and Calcium Carbonate were spatially separated and analyzed by using of high spatial resolution linear array detector and high speed imaging.

Sadler Library Search Result of Each Component

FTIR Imaging Microscopy

 

About the Author

Spectroscopy Group