Investigation on Thermal Degradation Process of Polymer Solar Cells Based on Blend of PBDTTT-C and BM

Figure 8

TEM images of the PBDTTT-C: PC₇₀BM films treated at 70°C for control (a), 1 hour (b), 2 hours (c), 3 hours (d), 5 hours (e), and 18 hours (f).

(a)

(b)

(c)

(d)

(e)

(f)