Crosslinkable Conjugated Donor and Acceptor Polymers bearing Vinyl Moieties in the Side-Chain for Improving the Stability of All-Polymer Solar Cellsall-polymer solar cell
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All-polymer solar cells(all-PSCs) have recently been designed and synthesized because of their advantages such as their film-forming properties and the mechanical stability of their active layers. However, even well-mixed polymer blend films can cause phase separation when placed in high temperature environment for a long time. To improve these problems, crosslinkable polymer blend system have been studied recently. In this study, random terpolymers, PBDBT-BV20 and N2200-TV10, were successfully synthesized by introducing vinyl functional groups in the side-chain. In addition, the power conversion efficiency (PCE) of polymer solar cells (PSCs) containing the crosslinked blend films recorded 5.12%. As was expected, the PSCs with the crosslinked blend film displayed excellent shelf-life over 52 days and thermal stability of the PCE. It also showed excellent mechanical stability in flexible PSCs using plastic substrates, resulting in outstanding sustainability of PCEs under bending stress.