Improved Hole Injection in Bulk Heterojunction (BHJ) Hybrid Solar Cells by Applying a Thermally Reduced Graphene Oxide Buffer Layer

Figure 6

Illustration of energy level alignment of devices with (a) PEDOT:PSS as the HTL, (b) PEDOT:PSS HTL, and rGO buffer as a layer. The work function value of thermally reduced GO of about 4.8 eV is taken from Reference [32].

(a)

(b)