Graphene for Transparent Electrodes and Organic Electronic Devices - Organic Solar Cells: Materials and Device Physics - page 91

Fig. 4.6 PL spectra of P3OT and P3OT/SPF Graphene composite films at an excitation
wavelength of 433 nm. The films were made by spin coating from solutions of P3OT (15 mg
mL -1 ) and P3OT/SPF Graphene (P3OT: 15 mg mL -1 , SPF Graphene content 5 %) at 2,000 rpm
for 9 s. The films are ca. 100 nm thick. Reproduced with permission [ 4 ]. Copyright 2008, Wiley-
VCH

Table 4.1 PV characteristics (V oc , J sc , FF, and PCE) of the devices with the structure ITO/
PEDOT:PSS (40 nm)/P3OT:SPFGraphene 100 nm)/LiF (1 nm)/Al (70 nm) under simulated
100 mW AM 1.5G illumination, having different graphene content with different annealing
treatment. Reproduced with permission [ 4 ]. Copyright 2008, Wiley-VCH
SPFGraphene
content [%]

J sc (mA/cm 2 ) Annealing V oc (V) FF PCE %

Temperature(C) Time(min)

0 No 0.38 0.014 0.18 0.0095

1 No 0.38 0.54 0.26 0.052

1 160 10 0.94 0.37 0.24 0.083

5 No 0.56 2.5 0.23 0.32

5 160 10 0.98 3.2 0.32 0.98

5 160 20 0.92 4.2 0.37 1.4

5 210 10 1.0 3.2 0.31 0.98

15 No 0.38 0.35 0.24 0.034

15 160 10 0.92 0.35 0.25 0.080

the removal of the functional groups, resulting in improved charge transport
mobility of these graphene sheets. In addition, the morphology of the P3OT matrix
can be improved, during the annealing process, with an increase in degree of
crystallinity and then an enhancement of the charge transport mobility. We also
fabricated similar OPV devices using P3HT/SPF Graphene as the active layer [ 5 ].
The detailed results were summarized in Table 4.2 . The P3HT/SPF Graphene-
based OPV devices also showed good OPV performance and similar graphene
loading and annealing treatment dependence as for the P3OT/SPF Graphene-based