Gel permeation chromatography (GPC) in 1,2-dichlorobenzene ( o -DCB) at 140 °C revealed a decreasing trend in the number average molecular weight ( M n ) from 148 to 88 kDa when increasing the amounts of 4T defects from 5% to 20% ( Table 1 ).
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On the homocoupling of trialkylstannyl monomers in the synthesis of diketopyrrolopyrrole polymers and its effect on the performance of polymer-fullerene photovoltaic cells.
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