| 초록 |
We investigate the effects of side chain engineering of P(NDI2OD-T2) polymer, which is the most widely used n-type polymer in all-PSCs and OFETs, 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). 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 efficiency irrespective of the electron donors. In particular, the PTB7-Th:P(NDI2HD-T2) forms highly ordered, strong face-on interchain stackings, and has better intermixed bulk-heterojunction morphology, producing the highest PCE of 6.11%. |
