| 초록 |
Tuning the side chains of conjugated polymers is a simple, yet effective strategy for modulating their structural and electrical properties, but their impact on n-type conjugated polymers has not been studied extensively. We investigate the effects of side chain engineering of P(NDI2OD-T2) polymer (Polyera Activink N2200) on their structural and electronic properties. We synthesize a series of naphthalenediimide-bithiophene-based copolymers (P(NDIR-T2)), with different side chains (R) of 2-hexyldecyl (2-HD), 2-octyldodecyl (2-OD), and 2-decyltetradecyl (2-DT). The P(NDI2HD-T2) exhibits more noticeable crystalline behaviors than P(NDI2OD-T2) and P(NDI2DT-T2), thereby facilitating superior three-dimensional charge transport. We produce a series of all-PSCs using different electron donors of PTB7-Th, PTB7, and PPDT2FBT. The P(NDI2HD-T2) based all-PSCs produce much higher power conversion efficiency (PCE) irrespective of the electron donors, producing the highest PCE of 6.11%. |
