Introducing Electron-Withdrawing Linking Units and Thiophene π-Bridges into Polymerized Small Molecule Acceptors for High-Efficiency All-Polymer Solar Cells,Chemistry of Materials

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Introducing Electron-Withdrawing Linking Units and Thiophene π-Bridges into Polymerized Small Molecule Acceptors for High-Efficiency All-Polymer Solar Cells
Chemistry of Materials ( IF 7.2 ) Pub Date : 2021-10-24 , DOI: 10.1021/acs.chemmater.1c02302
Liuyang Zhou _{1,

2} , Xinxin Xia ₃ , Lei Meng _{1,

2} , Jinyuan Zhang ₁ , Xinhui Lu ₃ , Yongfang Li _{1,

2,

4}

Affiliation

A series of narrow bandgap polymer acceptors (PY5-BTZ, PY5-2TZ, PY5-PZ, and PY5-BT) were synthesized by copolymerizing a Y5-like small molecule acceptor (SMA) and different electron-withdrawing (A) units with thiophene π-bridges. Among the polymerized SMAs (PSMAs), the A-unit is bifluoro-benzotriazole for PY5-BTZ, thiazolo[5,4-d]thiazole for PY5-2TZ, pyrazine for PY5-PZ, and benzothiadiazole for PY5-BT. The four PSMA films possess narrower bandgaps of 1.43–1.45 eV. Interestingly, PY5-BTZ shows a higher-lying LUMO energy level of −3.72 eV (−3.76 eV for PY5-2TZ, −3.75 eV for PY5-PZ, and −3.78 eV for PY5-BT) and a stronger absorbance of 1.5 × 10⁵ cm^–1 (1.4 × 10⁵ cm^–1 for the other three PSMAs). The all-polymer solar cells (all-PSCs) with PY5-BTZ as the polymer acceptor and PBDB-T as the polymer donor exhibit a peak power conversion efficiency of 14.82% with a high open circuit voltage of 0.92 V, which benefits from the higher-lying LUMO level and stronger absorbance of the PY5-BTZ polymer acceptor. The results indicate that introducing weak electron-withdrawing A-units and thiophene π-bridges could be an effective approach in designing and synthesizing high-performance PSMA polymer acceptors for high-efficiency all-PSCs in the future.

中文翻译：

将吸电子连接单元和噻吩 π 桥引入用于高效全聚合物太阳能电池的聚合小分子受体中

通过将类Y5小分子受体（SMA）和不同吸电子（A）单元与噻吩共聚，合成了一系列窄带隙聚合物受体（PY5-BTZ、PY5-2TZ、PY5-PZ和PY5-BT） π 桥。在聚合的 SMA (PSMA) 中，A 单元是 PY5-BTZ 的双氟苯并三唑、PY5-2TZ 的噻唑并[5,4- d ]噻唑、PY5-PZ 的吡嗪和 PY5-BT 的苯并噻二唑。四种 PSMA 薄膜具有 1.43-1.45 eV 的较窄带隙。有趣的是，PY5-BTZ 显示出更高的 LUMO 能级 -3.72 eV（PY5-2TZ 为 -3.76 eV，PY5-PZ 为 -3.75 eV，PY5-BT 为 -3.78 eV）和 1.5 × 10 ⁵ cm ^–1 (1.4 × 10 ⁵ cm ^–1对于其他三个 PSMA）。以 PY5-BTZ 作为聚合物受体和 PBDB-T 作为聚合物供体的全聚合物太阳能电池 (all-PSCs) 表现出 14.82% 的峰值功率转换效率和 0.92 V 的高开路电压，这得益于PY5-BTZ 聚合物受体具有更高的 LUMO 能级和更强的吸光度。结果表明，引入弱吸电子A单元和噻吩π桥可能是未来设计和合成高性能PSMA聚合物受体的有效方法，用于高效的全PSC。

更新日期：2021-11-09

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