3.1 Effect of ICO/Ag back reflector for SCH solar cell
For most reported SCH solar cells with the carrier transport layer on
the back side, the metal electrode was usually deposited directly on the
carrier transport layer [26,27]. Although the
process is relatively simple, the parasitic absorption of the metal
electrode often leads to reductions in the quantum efficiency and
Jsc. Indium cerium oxide (ICO), recently widely used in
the SHJ solar cells as the TCO layer, shows excellent optoelectronic
properties such as high mobility, high transmittance, and low free
carrier absorption[28,29,30]. Here, besides
serving as the top transparent electrode, ICO film is inserted between
the MoOx layer and the back Ag electrode in the SCH
solar cells as shown in Figure 1 (a). The ICO/Ag combination on the rear
of the SCH solar cells was expected to serve as a back reflector.