5 Polymer Solar Cells: Development of π-Conjugated Polymers …
101
films of PTzBT-14HD and -EHOD, and PTzBT-12OD and BOHD, as representatives
of the edge-on- and face-on-polymers, respectively, which were fabricated on both
the ZnO surface (ZnO coated ITO glass) and the PEDOT:PSS surface (PEDOT:PSS
coated ITO glass) with different thicknesses [26]. We then performed a pole figure
analysis for the lamellar diffraction of each film [27, 28]. Figure 5.11 depicts the linecut profiles of the lamellar diffraction along the azimuth angle (χ ) for PTzBT-14HD
and-12OD on the ZnO and PEDOT:PSS surfaces. The face-on/edge-on ratio can be
quantified by dividing the peak area for the face-on crystallite (A xy : 0–45° and 135–
180°) by that for the edge-on crystallite (A z : 55–125°) (see Supporting Information).
Note that A xy /A z does not necessarily indicate the real face-on/edge-on ratio, since
the scattering from the direct beam overlaps with the first order lamellar diffraction,
especially along the q z axis, which overestimates the A z value.
Figure 5.12a and b show the plots of A xy /A z as a function of the thickness for the
blend PTzBT/PC 61 BM films fabricated on ZnO and PEDOT:PSS, respectively. In
all the polymers, the A xy /A z values were slightly higher for the films on ZnO than
for the films on PEDOT:PSS, indicating that the polymers have a higher tendency
to form face-on orientation on ZnO than PEDOT:PSS. Further, in both surfaces, the
0
0.5
1.0
1.5
2.0
qxy (Å -1 )
0
0 . 5
1 . 0
1 . 5
2 . 0
qz (Å -1
)
a
b
χaxis
Fig. 5.11 a, b Simple model for pole figure analysis. a 2D GIXD pattern showing how to take
line-cut profiles along the azimuth angle (χ). b Pole figure plot for the lamella diffraction cut along
the χ angle. c–j Pole figure plots extracted from the lamellar diffraction for PTzBT/PC 61 BM blend
films on the ITO/ZnO c–f and ITO/ZnO g–j substrates: c, g PTzBT-14HD, d, h PTzBT-EHOD, e,
i PTzBT-12OD, f, j PTzBT-BOHD Reproduced with permission [26]. Copyright (2018) American
Chemical Society
101
films of PTzBT-14HD and -EHOD, and PTzBT-12OD and BOHD, as representatives
of the edge-on- and face-on-polymers, respectively, which were fabricated on both
the ZnO surface (ZnO coated ITO glass) and the PEDOT:PSS surface (PEDOT:PSS
coated ITO glass) with different thicknesses [26]. We then performed a pole figure
analysis for the lamellar diffraction of each film [27, 28]. Figure 5.11 depicts the linecut profiles of the lamellar diffraction along the azimuth angle (χ ) for PTzBT-14HD
and-12OD on the ZnO and PEDOT:PSS surfaces. The face-on/edge-on ratio can be
quantified by dividing the peak area for the face-on crystallite (A xy : 0–45° and 135–
180°) by that for the edge-on crystallite (A z : 55–125°) (see Supporting Information).
Note that A xy /A z does not necessarily indicate the real face-on/edge-on ratio, since
the scattering from the direct beam overlaps with the first order lamellar diffraction,
especially along the q z axis, which overestimates the A z value.
Figure 5.12a and b show the plots of A xy /A z as a function of the thickness for the
blend PTzBT/PC 61 BM films fabricated on ZnO and PEDOT:PSS, respectively. In
all the polymers, the A xy /A z values were slightly higher for the films on ZnO than
for the films on PEDOT:PSS, indicating that the polymers have a higher tendency
to form face-on orientation on ZnO than PEDOT:PSS. Further, in both surfaces, the
0
0.5
1.0
1.5
2.0
qxy (Å -1 )
0
0 . 5
1 . 0
1 . 5
2 . 0
qz (Å -1
)
a
b
χaxis
Fig. 5.11 a, b Simple model for pole figure analysis. a 2D GIXD pattern showing how to take
line-cut profiles along the azimuth angle (χ). b Pole figure plot for the lamella diffraction cut along
the χ angle. c–j Pole figure plots extracted from the lamellar diffraction for PTzBT/PC 61 BM blend
films on the ITO/ZnO c–f and ITO/ZnO g–j substrates: c, g PTzBT-14HD, d, h PTzBT-EHOD, e,
i PTzBT-12OD, f, j PTzBT-BOHD Reproduced with permission [26]. Copyright (2018) American
Chemical Society