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 1

Molecular weight of the polymers.

𝑀 𝑛 (kg/mol) 𝑀 𝑤 (kg/mol) 𝑃 𝐷 𝐼

P14.86.31.33
P22.93.41.19
P327.168.82.54