Water/Ethanol-Soluble Naphthalene Diimide-Based Polymer Acceptors for Efficient and Air-Stable All-Polymer Solar Cells
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초록
내용
A new series of naphthalene diimide (NDI)-based and water/ethanol-soluble n-type polymers was synthesized and applied as electron acceptors in eco-friendly polymer solar cells (eco-PSCs). The length of hydrophilic oligoethylene gylcol (OEG) side chain and the backbone structure were modified to the extent that the solubility in the aqueous solvent is ensured. Consequently, three polymer acceptors named P(NDIDEG-T), P(NDITEG-T), and P(NDITEG-T2) were developed and a record high power conversion efficiency (PCE) of 2.15% was achieved. Notably, the solar cell devices also exhibited an outstanding air stability maintaining more than 90% of the initial PCE in ambient conditions after 4 days. As we pioneered the first and high-performance eco-PSCs based on non-fullerene acceptors, this work provides an important direction for further material design in eco-PSCs.