Figure 2From: Graphene as a transparent conducting and surface field layer in planar Si solar cellsOptical image and transmittance of graphene. (a) Optical image of a large-area (~6.5 × 2.5 cm2) graphene transferred onto a SiO2 (300 nm)/Si substrate. (b) Transmittance of graphene after it was transferred onto a quartz substrate. The inset photograph of (b) shows the transparency of the transferred graphene sample.Back to article page