Enhanced Carrier Collection in P-Ni1 − Xo:Li/n-Si Heterojunction Solar Cells Using LiF/Al Electrodes

This study confirms that a LiF/Al (LiF thickness=15Å) stack is an efficient Ohmic contact method for use in p-Ni1−xO:Li/n-Si heterojunction solar cell applications. The maximal conversion efficiency obtained was 6.31%, which was 2.1% greater compared with that of Al-only electrode cell. Temperature-dependent current–voltage measurements confirmed that the carrier transport mechanism was dipole-assisted tunneling at the interface. The insertion of LiF acted as an effective Ohmic contact method and also assisted the back surface passivation.