The existing class of polymer solar cells is undergoing a dilemma between two types of acceptors; i) non-fullerene small molecular acceptors (NFSMAs) with high power conversion efficiencies (PCEs) but inferior operational stabilities, and ii) polymer acceptors (PAs) for all polymer solar cells (all-PSCs) with excellent stabilities but lower PCEs due to demixing of polymer donors (PDs) and polymer acceptors (PAs). Here, we design new PAs [P(BDT2BOY5-X), X = H, F, Cl], based on two major principles; i) polymerizing NFSMA to endow both excellent efficiency and mechanical ductility, and ii) embedding same building unit (i. e., BDT) into both the PD and PA to generate high molecular compatibility. The all-PSCs with P(BDT2BOY5-X) PAs exhibit highly enhanced morphological compatibilities, higher PCE (11.12%) and superior thermal/mechanical stabilities compared to the devices with NFSMA or conventional PA, suggesting a crucial consideration in the PA designs for efficient and stable all-PSCs.

Polymer acceptor and donor sharing same benzodithiophene unit with high molecular compatibility enabled efficient, thermally stable, and mechanically robust all-polymer solar cells

ACS Spring Meeting 2021

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