“N-π-N”型低聚受体实现18.19%的OPV效率，能量损失低，稳定性好,Advanced Science

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“N-π-N”型低聚受体实现18.19%的OPV效率，能量损失低，稳定性好
Advanced Science ( IF 14.3 ) Pub Date : 2022-06-16 , DOI: 10.1002/advs.202202513
Lili Zhang _{1,

2} , Ziqi Zhang _{1,

3} , Dan Deng _{1,

3} , Huiqiong Zhou ₁ , Jianqi Zhang _{1,

3} , Zhixiang Wei _{1,

3}

Affiliation

报道了一种新型的“N- π -N”型2BTP-2F-T寡聚受体，由两个与噻吩π桥相连的小的非富勒烯受体（NFA）单元构成。2BTP -2F-T不仅结合了小NFA和聚合物受体（PYF-T- o）等类似单元的优点，而且表现出高吸收系数和高电子迁移率（μe _）的优越特性，对分子的依赖性较小。包装。使用 PM6 作为施主，在 0.911 V 的开路 ( V _oc )和 25.50 mA cm ^-2的短路 ( J _{sc ) 条件下获得了 18.19% 的显着效率}, 填充因子 (FF) 为 78.3%，远优于相应的单体 (16.54%) 和 PYF-T- o (15.8%) 基器件。效率的大幅提高来自两个方面：1）由于μ _e和良好控制的形态大大改善，FF 增强；2) ( J _sc × V _oc )的较高值是由于其较高的吸收系数和在类似的低能量损失下有效产生电荷。此外，PM6/2BTP-2F-T 器件具有最长的 T _{80光浸泡寿命和与 PM6/PYF-T-}o相当的高热稳定性。结果表明，“N- π-N”型低聚受体由于其优越的高效率和提高的稳定性在有机太阳能电池中具有很大的应用前景。

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“N-π-N” Type Oligomeric Acceptor Achieves an OPV Efficiency of 18.19% with Low Energy Loss and Excellent Stability

A novel “N-π-N” type oligomeric acceptor of 2BTP-2F-T, constructed by two small non-fullerene acceptor (NFA) units linked with a thiophene π bridge is reported. The 2BTP-2F-T not only combines the advantages of small NFA and polymeric acceptors (PYF-T-o) with similar units but also exhibits superior characteristics of high absorption coefficient and high electron moblity(µ_e)) with less dependence on molecular packing. Using PM6 as the donor, a remarkable efficiency of 18.19% is obtained with an open circuit (V_oc) of 0.911 V, short current circuit (J_sc) of 25.50 mA cm⁻², and fill factor (FF) of 78.3%, which is much better than that of the corresponding monomer (16.54%) and PYF-T-o (15.8%) based devices. The much-improved efficiency results from two aspects: 1) an enhanced FF due to the largely improved µ_e and well-controlled morphology ; 2) a higher value of (J_sc × V_oc) due to its higher absorption coefficient and efficient charge generation at a similar low energy loss. Furthermore, the PM6/2BTP-2F-T device possesses the longest T₈₀ lifetime to light-soaking and comparable high thermal stability with PM6/PYF-T-o. The results indicate that the “N-π-N” type oligomeric acceptor has a great application prospect due to its superior high efficiency and improved stability in organic solar cells.

更新日期：2022-06-16

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