Doped graphene electrodes for organic solar cells

Publication Type:

Journal Article

Source:

Nanotechnology, iopscience.iop.org, Volume 21, Issue 50, p.505204 (2010)

ISBN:

0957-4484

Keywords:

2010, 2013 and earlier

Abstract:

In this work graphene sheets grown by chemical vapor deposition (CVD) with controlled numbers of layers were used as transparent electrodes in
organic photovoltaic (OPV) devices. It was found that for devices with
pristine graphene electrodes, the power conversion efficiency (PCE) is
comparable to their counterparts with indium tin oxide (ITO) electrodes.
Nevertheless, the chances for failure in OPVs with pristine graphene
electrodes are higher than for those with ITO electrodes, due to the
surface wetting challenge between the hole-transporting layer and the
graphene electrodes. Various alternative routes were investigated and it
was found that AuCl(3) doping on graphene can alter the graphene surface
wetting properties such that a uniform coating of the hole-transporting
layer can be achieved and device success rate can be increased.
Furthermore, the doping both improves the conductivity and shifts the work
function of the graphene electrode, resulting in improved overall PCE
performance of the OPV devices. This work brings us one step further
toward the future use of graphene transparent electrodes as a replacement
for ITO.