Nonhalogen Solvent‐Processed Asymmetric Wide‐Bandgap Polymers for Nonfullerene Organic Solar Cells with Over 10% Efficiency,Advanced Functional Materials

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Nonhalogen Solvent‐Processed Asymmetric Wide‐Bandgap Polymers for Nonfullerene Organic Solar Cells with Over 10% Efficiency
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-02-20 , DOI: 10.1002/adfm.201706517
Yongkang An _{1,

2} , Xunfan Liao _{1,

2,

3} , Lie Chen _{1,

2} , Jingping Yin _{1,

2} , Qingyun Ai _{1,

2} , Qian Xie _{1,

2} , Bin Huang _{1,

2} , Feng Liu ₄ , Alex K.-Y. Jen _{3,

5} , Yiwang Chen _{1,

2}

Affiliation

Two new wide‐bandgap D–A–π copolymer donor materials, PBDT‐2TC and PBDT‐S‐2TC, based on benzodithiophene and asymmetric bithiophene with one carboxylate (2TC) substituent are synthesized by a facile approach for fullerene‐free organic solar cells (OSCs). The combination of one carboxylate‐substituted thiophene with one thiophene bridge in the backbone substantially reduces the steric hindrance, thereby favoring a planar geometry for efficient charge transport and molecular packing. A reasonable highest‐occupied‐molecular‐orbital energy level in relation to that of the acceptor and balanced hole and electron transport are observed for both polymers. This asymmetric structure unit is flexible and versatile, allowing the absorption, energy levels, and morphology of the blend films to be tailored. Fullerene‐free OSCs based on PBDT‐S‐2TC:ITIC achieve a high power conversion efficiency of 10.12%. More impressively, a successful nonhalogen solvent‐processed solar cell with 9.55% efficiency is also achieved, which is one of the highest values for a fullerene‐free OSC processed using an ecofriendly solvent.

中文翻译：

非卤素溶剂处理的不对称宽带隙聚合物，用于非富勒烯有机太阳能电池，效率超过10％

通过一种简便的方法合成了两种新的宽带隙D–A–π共聚物供体材料PBDT-2TC和PBDT-S-2TC，它们基于苯并二噻吩和带有一个羧酸根（2TC）取代基的不对称联噻吩，适用于不含富勒烯的有机太阳能电池（OSC）。主链上一个羧酸取代的噻吩与一个噻吩桥的结合可显着降低空间位阻，从而有利于实现有效的电荷传输和分子堆积的平面几何形状。相对于受体而言，合理的最高分子轨道能级是合理的，并且两种聚合物均能观察到平衡的空穴和电子传输。这种不对称的结构单元灵活，用途广泛，可以定制共混膜的吸收率，能级和形态。基于PBDT-S-2TC的无富勒烯OSC：ITIC实现了10.12％的高功率转换效率。更令人印象深刻的是，还成功实现了效率为9.55％的无卤溶剂处理太阳能电池，这是使用环保溶剂处理的无富勒烯OSC的最高值之一。

更新日期：2018-02-20

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