A 3,3′-Difluoro-2,2′-Bithiophene Based Donor Polymer Realizing High Efficiency (>17%) Single Junction Binary Organic Solar Cells,Small

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A 3,3′-Difluoro-2,2′-Bithiophene Based Donor Polymer Realizing High Efficiency (>17%) Single Junction Binary Organic Solar Cells
Small ( IF 13.0 ) Pub Date : 2024-04-23 , DOI: 10.1002/smll.202310028
Zhiyi Su ₁ , Wenlong Liu ₁ , Yi Lin ₂ , Zaifei Ma _{1,

2} , Andong Zhang ₃ , Hao Lu ₄ , Xinjun Xu ₁ , Cuihong Li ₁ , Yahui Liu ₃ , Zhishan Bo _{1,

3}

Affiliation

In this study, two novel donor–acceptor (D–A) copolymers are designed and synthesized, DTBT-2T and DTBT-2T2F with 2,2′-bithiophene or 3,3′-difluoro-2,2′-bithiophene as the donor unit and dithienobenzothiadiazole as the acceptor unit, and used them as donor materials in non-fullerene organic solar cells (OSCs). Due to enhanced planarity of polymer chains resulted by the intramolecular F···S noncovalent interactions, the incorporation of 3,3′-difluoro-2,2′-bithiophene unit instead of 2,2′-bithiophene into the polymers can enhance their molecular packing, crystallinity and hole mobility. The DTBT-2T:L8-BO based binary OSCs deliver a power conversion efficiency (PCE) of only 9.71% with a V_oc of 0.78 V, a J_sc of 20.69 mA cm⁻²_, and an FF of 59.67%. Moreover, the introduction of fluoro atoms can lower the highest occupied molecular orbital levels. As a result, DTBT-2T2F:L8-BO based single-junction binary OSCs exhibited less recombination loss, more balanced charge mobility, and more favorable morphology, resulting in an impressive PCE of 17.03% with a higher V_oc of 0.89 V, a J_sc of 25.40 mA cm⁻², and an FF of 75.74%. These results indicate that 3,3′-difluoro-2,2′-bithiophene unit can be used as an effective building block to synthesize high performance polymer donor materials. This work greatly expands the selection range of donor units for constructing high-performance polymers.

中文翻译：

基于 3,3'-二氟-2,2'-联噻吩的供体聚合物实现高效率 (>17%) 单结二元有机太阳能电池

在本研究中，设计并合成了两种新型供体-受体（D-A）共聚物： DTBT-2T和DTBT-2T2F，以2,2'-联噻吩或3,3'-二氟-2,2'-联噻吩为供体单元和二噻吩并苯并噻二唑作为受体单元，并将其用作非富勒烯有机太阳能电池（OSC）中的供体材料。由于分子内F·S非共价相互作用增强了聚合物链的平面性，在聚合物中引入3,3'-二氟-2,2'-联噻吩单元代替2,2'-联噻吩可以增强聚合物链的平面性。分子堆积、结晶度和空穴迁移率。基于DTBT-2T :L8-BO的二元OSC的功率转换效率(PCE)仅为9.71%， V _oc为0.78 V， J _sc为20.69 mA cm ^-2 ， FF为59.67%。此外，氟原子的引入可以降低最高占据分子轨道能级。因此，基于DTBT-2T2F :L8-BO 的单结二元 OSC 表现出更少的复合损失、更平衡的电荷迁移率和更有利的形态，导致令人印象深刻的 17.03% 的 PCE 和 0.89 V 的更高V _oc ， J _sc为25.40 mA cm ^-2 ， FF为75.74%。这些结果表明3,3'-二氟-2,2'-联噻吩单元可以作为合成高性能聚合物供体材料的有效结构单元。这项工作极大地扩展了构建高性能聚合物的供体单元的选择范围。

更新日期：2024-04-23

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