Graphene for Transparent Electrodes and Organic Electronic Devices - Organic Solar Cells: Materials and Device Physics - page 87

Fig. 4.3 (a) Schematic representation of part of the structure of graphene-PEDOT. (b) A picture
of a graphene-PEDOT film with a thickness of *32 nm on a transparent PMMA substrate. (c-f).
Structure of GO (c) and thermally reduced GO (d); Simultaneous reduction of GO and recovery of
graphene structure (e), to obtain near pristine graphene (f). (g) Scheme of the composite of CNT
and GO. (a-b) Reproduced with permission [ 37 ]. Copyright 2009, Springer (c-f) Reproduced with
permission [ 38 ]. Copyright 2011,(g) Reproduced with permission [ 39 ]. Copyright 2009,ACS
was observed: the values of U w of the rGO-SWCNT electrodes decreased from
4.6 eV when doped with Li 2 CO 3 to 3.4 eV when doped with Cs 2 CO 3 (Fig. 4.4 b).
The formation of interfacial dipoles was presumed to be the reason for decreasing
the work function of the rGO-SWCNT composites. Inverted P3HT/PCBM solar
cells employing Cs 2 CO 3 doped rGO-SWCNTs as transparent electrode (transpar-
ency 65.8 % at 550 nm and sheet resistance 331 X/sq) was fabricated and gave