Theoretical Study on the Photoelectric Properties of a Class of Copolymers Based on Benzodithiophene for Solar Cells

Table 2

Bandwidth (eV) and effective mass (m).

Polymer	Conduction band		Valance band
	BW	m(×10^4)	BW	m(×10^4)
PBDTTBT	0.08	9.45	0.25	−4.45
PBDTTTP	0.13	5.82	0.38	−2.91
PBDTTTO	0.16	5.04	0.34	−2.91
PBDTTTPD	0.03	12.6	0.33	−2.91
PBDTTFPD	0.03	12.6	0.30	−3.29