2 research outputs found
Siloxane-Terminated Side Chain Engineering of Acceptor Polymers Leading to Over 7% Power Conversion Efficiencies in All-Polymer Solar Cells
To
investigate the influence of functional pendent groups on acceptor
polymers and photovoltaic properties of all-polymer solar cells (all-PSCs),
two novel acceptor polymers containing siloxane-terminated side chains
are synthesized and characterized. Increasing the content of siloxane-terminated
side chains can reduce π–π stacking distance and
improve crystalline behavior, yet lead to poorer solubility of the
acceptor polymers. By modulating the proper loadings of siloxane-terminated
side chains on the acceptor polymers, the PBDB-T:PNDI-Si25 all-PSC
attains a maximal power conversion efficiency (PCE) of 7.4% with an
outstanding fill factor of 0.68. The results provide new insights
for developing high-performance all-PSCs through functional group
engineering on the acceptor polymers, to achieve good solubility,
polymer miscibility, and blend morphology