【摘 要】
：
Significant progress has been witnessed in the development of organic solar cells (OSCs) with power conversion efficiency (PCE)over 18％ due to the tremendous breakthrough of non-fullerene fused-ring small molecule acceptors (SMAs) in recent years [1-3].Al
【机 构】
：
Department of Chemistry and Chemical Engineering,Chalmers University of Technology,G(o)teborg SE-412
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Significant progress has been witnessed in the development of organic solar cells (OSCs) with power conversion efficiency (PCE)over 18％ due to the tremendous breakthrough of non-fullerene fused-ring small molecule acceptors (SMAs) in recent years [1-3].Although OSCs comprising of a polymer donor and a SMA have achieved the highest PCE,all-polymer solar cells (all-PSCs) consist-ing of tightly entangled polymer donor and polymer acceptor are generally considered to be the most promising practical wearable power generators in the future due to their outstanding device sta-bility under mechanical and thermal stresses [4,5].Fan et al.[4]systematically compared the mechanical properties of the flexible devices based on all-polymer and polymer:SMA blends with the same polymer donor.The all-polymer blend shows excellent mechanical elongation and high toughness of 9.3 MJ m-3,which are 6 and 11 times higher than those of the polymer:SMA one,respectively.The related flexible all-PSCs maintained ＞90％ of their initial PCE after bending and relaxing 1200 times at a bending radius of 4 mm,which is much superior to the SMA-based flexible OSCs.Lee et al.[5] developed an all-PSC that retained over 90％ of its initial PCE even after 100 h continuous heating at 100 ℃,better than the relevant SMA-based OSCs.Driven by the above-men-tioned advantages,several polymer acceptors based on Y6-derive-tives have been developed and boosted the PCEs of all-PSCs up to 17％ in the past two years (Fig.1 and Table 1).
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