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Side chain engineering is widely explored to improve polymer solubility, morphology and film aggregation of organic solar cells (OSCs). A chlorine-contained polymer (PBDT-Al5) consists of BDT with short alkyl side chain (pentyl) in combination with BDD moiety was synthesized and photovoltaic behaviors were investigated. PBDT-Al5 displayed good stability and solubility in various solvents. Non-halogenated solvent processed OSCs are fabricated with PBDT-Al5:IT-4F, which exhibited PCE of 7.32% in presence of DPE additive with improved charge carrier mobility. As results, the rational design and synthesis of chlorinated donor polymer is effective strategy to improve the photovoltaic efficiencies of non-fullerene OSCs(NFOSCs).

Pentyl side chain-based benzoditiophene π-conjugated polymer for non-halogenated solvent processed organic solar cells