A Benzobis(thiazole)-Based Wide Bandgap Polymer Donor Enables over 15% Efficiency Organic Photovoltaics with a Flat Energetic Offset,Macromolecules

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A Benzobis(thiazole)-Based Wide Bandgap Polymer Donor Enables over 15% Efficiency Organic Photovoltaics with a Flat Energetic Offset
Macromolecules ( IF 5.1 ) Pub Date : 2021-08-19 , DOI: 10.1021/acs.macromol.1c01301
Shanlu Wang ₁ , Yangdan Tao ₁ , Shuixing Li ₁ , Xinxin Xia ₂ , Zeng Chen ₃ , Minmin Shi ₁ , Lijian Zuo ₁ , Haiming Zhu ₃ , Xinhui Lu ₂ , Hongzheng Chen ₁

Affiliation

Developing donor:acceptor (D:A) blends that work efficiently with small charge separation driving forces (or energetic offset) is highly desired for reducing the voltage loss and unveiling the working mechanism of organic photovoltaics (OPVs). Herein, by incorporating the weak electron-withdrawing acceptor unit of benzobis(thiazole), we design and synthesize two wide-bandgap (∼2 eV) polymer donors, PBTz-TF and PBTz-TCl, with deep highest occupied molecular orbital (HOMO) levels approaching that of the typical electron acceptor Y6, forming negligible HOMO offsets of 0.04 and 0 eV for PBTz-TF:Y6 and PBTz-TCl:Y6 blends, respectively. Interestingly, efficient charge separation is observed in both blends, while the PBTz-TCl:Y6 blend possesses multiple superiorities, including higher mobilities, longer exciton lifetimes, purer domains, and more dominant face-on orientation. These lead to a better efficiency of 15.06% at 0 eV HOMO offset in the PBTz-TCl:Y6-based OPV, which is superior compared to the PBTz-TF:Y6-based OPVs (14.73%) with a HOMO offset of 0.04 eV. This work explores the properties of low driving force D:A blends and should have implications in the fundamental understanding of the carrier dynamics in OPVs with a flat energetic offset.

中文翻译：

基于苯并双（噻唑）的宽带隙聚合物供体使具有平坦能量偏移的有机光伏效率超过 15%

开发以小电荷分离驱动力（或能量偏移）有效工作的供体：受体（D：A）混合物对于降低电压损失和揭示有机光伏（OPV）的工作机制是非常需要的。在此，通过结合苯并双（噻唑）的弱吸电子受体单元，我们设计并合成了两种宽带隙（~2 eV）聚合物供体，PBTz-TF 和 PBTz-TCl，具有深的最高占据分子轨道（HOMO）水平接近典型电子受体 Y6 的水平，分别为 PBTz-TF:Y6 和 PBTz-TCl:Y6 混合物形成 0.04 和 0 eV 的可忽略的 HOMO 偏移。有趣的是，在两种混合物中都观察到了有效的电荷分离，而 PBTz-TCl:Y6 混合物具有多种优势，包括更高的迁移率、更长的激子寿命、更纯的畴、和更占主导地位的面对面取向。这些导致基于 PBTz-TCl:Y6 的 OPV 在 0 eV HOMO 偏移时的效率更高，为 15.06%，与基于 PBTz-TF:Y6 的 OPV (14.73%) 相比，HOMO 偏移为 0.04 eV . 这项工作探索了低驱动力 D:A 混合物的特性，应该对 OPV 中具有平坦能量偏移的载流子动力学的基本理解产生影响。

更新日期：2021-09-14

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