Exciton and Charge Dynamics in Polymer Solar Cells Studied by Transient Absorption Spectroscopy - Organic Solar Cells: Materials and Device Physics - page 125

Fig. 5.16 Normalized
transient absorption decays of
RRa-P3HT:PCBM (50:50 w/
w) blend films excited at
400 nm measured at
a 1030 nm and b 480 nm.
The transient decay is fitted
with an exponential function
and a constant:
DOD(t) = A D [1 - exp(-t/
s D )] ? B. The broken lines
represent the best-fitting
curve. Adapted with
permission from [ 19 ].
Copyright 2010 American
Chemical Society

(a)

1030 nm

1

0.5

0

480 nm

(b)

-0.5

-1

0 1 2 3

Time / ns

Fig. 5.17 Transient
absorption decays of RRa-
P3HT:PCBM (50:50 w/w)
blend films excited at 400 nm
measured at a 1030 nm,
b 850 nm, and c 480 nm. The
excitation intensity is varied
over 6, 12, 24, 48, 72,
120 lJcm -2 from bottom to
top in each panel. The
negative signals at 480 nm
are converted to positive.
Adapted with permission
from [ 19 ]. Copyright 2010
American Chemical Society

(a)

1030 nm

-2

10

-3

10

(b)

850 nm

-2

10

480 nm

(c)

-2

10

0.1 1 2

Time / ns

Fig. 5.18 Transient
absorption decays of RR-
P3HT:PCBM (50:50 w/w)
blend films after thermal
annealing excited at 400 nm
measured at a 700 nm and
b 1000 nm. The excitation
intensity is 6, 12, 24, 48, 72,
120 lJcm -2 from bottom to
top in each panel. Adapted
with permission from [ 19 ].
Copyright 2010 American
Chemical Society

(a)

10 -2 700 nm

10 -3

(b)

1000 nm

10 -2

10 -3

0 1 2

Time / ns