Impact of standard front and rear side albedo spectra on the band alignment optimization of n-i-p solar cells

This paper investigates the impact of spectrum distribution on the device optimization of n-i-p solar cells using band-alignment analysis. Band-structure has been optimized for three standard spectra: AM1.5G front, AM1.5 rear, and combined front/rear spectra for bifacial devices. Multi-dimensional optimization showed that absorber bandgap and electron-affinity of hole/electron transport materials are the most sensitive to spectra. Front side AM1.5G analysis revealed an optimal bandgap of 1.25 eV with 28.78% efficiency whereas the rear side predicted 1.13 eV with 31.97% efficiency due to spectral red-shifting. Data generated for optimized layers can then be employed for material screening for enhanced device performance.