Research Article

Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b:4,5-b′]dithiophene/2,1,3-benzothiadiazole Copolymers

Table 3

Photovoltaic characteristics of best devices prepared from P1P3 and PC61BM at a polymer.

𝑉 o c (V) 𝐽 s c (mA/cm2)FFPCE (%)

P10.691.220.420.33
P20.710.810.330.19
P30.738.930.462.99