Light-managing techniques at front and rear interfaces for high performance amorphous silicon thin film solar cells

Abstract

We focused on light management technology in amorphous silicon solar cells to suppress increase in absorber thickness for improving power conversion efficiency (PCE). MgF2 and TiO2 anti-reflection layers were coated on both sides of Asahi VU (glass/SnO2:F) substrates, which contributed to increase in PCE from 9.16% to 9.81% at absorber thickness of only 150 nm. Also, we applied very thin MgF2 as a rear reflector at n-type nanocrystalline silicon oxide/Ag interface to boost photocurrent. By reinforcing rear reflection, we could find the PCE increase from 10.08% up to 10.34% based on thin absorber about 200 nm. © The Korean Institute of Electrical Engineers.