A–DA′D–A-Type Pentacyclic Fused-Ring Electron Acceptors for Efficient Organic Solar Cells,Chemistry of Materials

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A–DA′D–A-Type Pentacyclic Fused-Ring Electron Acceptors for Efficient Organic Solar Cells
Chemistry of Materials ( IF 7.2 ) Pub Date : 2023-08-21 , DOI: 10.1021/acs.chemmater.3c01216
Zhiqiang Wang ₁ , Wenkui Wei ₁ , Liang Zeng ₁ , Tao Liu ₁ , Xiyue Yuan ₁ , Jiadong Zhou ₁ , Bingyan Yin ₁ , Junyu Li ₂ , Zengqi Xie ₁ , Fei Huang ₁ , Yong Cao ₁ , Chunhui Duan ₁

Affiliation

Although superior power conversion efficiencies (PCEs) (>19%) have been achieved by organic solar cells (OSCs), high materials cost severely prevents this photovoltaic technology from laboratory to industrial maturity. Particularly, the prevailing A–DA′D–A-type heptacyclic fused-ring electron acceptors (FREAs) suffered from arduous synthesis and extremely low overall synthetic yield. Herein, we report three A–DA′D–A-type pentacyclic FREAs (BTPT4F-EH, BTPT4F-BO, and BTPT4F-HD) with varied side chain length for application in OSCs. Compared with the prevailing heptacyclic FREAs, the pentacyclic FREAs exhibited much lower synthetic complexity. Single-crystal analysis unraveled that stair-like two-dimensional molecular stacking mode was formed in the crystal of BTPT4F-BO due to the existence of strong π–π interactions and hydrogen bonds, which could guarantee efficient charge transport in A–DA′D–A-type pentacyclic FREAs. As a result, a remarkable PCE of 15.0% has been offered by the OSC based on BTPT4F-BO. The high PCE and low synthetic complexity further contributed to an unprecedented figure of merit (FOM = 0.36) for BTPT4F-BO. This work suggests, with respect to heptacyclic FREAs, A–DA′D–A-type pentacyclic FREAs are more competitive candidates for the future industrial manufacturing of OSCs.

中文翻译：

用于高效有机太阳能电池的 A-DA′D-A 型五环稠环电子受体

尽管有机太阳能电池 (OSC) 已经实现了卓越的功率转换效率 (PCE) (>19%)，但高昂的材料成本严重阻碍了这种光伏技术从实验室走向工业成熟。特别是，目前流行的A-DA'D-A型七环稠环电子受体（FREA）合成难度大，总合成产率极低。在此，我们报道了三种具有不同侧链长度的 A-DA'D-A 型五环 FREA（BTPT4F-EH、BTPT4F-BO 和 BTPT4F-HD），用于 OSC 中的应用。与主流的七环FREA相比，五环FREA的合成复杂性要低得多。单晶分析表明，由于强π-π相互作用和氢键的存在，BTPT4F-BO晶体中形成了阶梯状二维分子堆积模式，这可以保证A-DA′D-A型五环FREA中有效的电荷传输。结果，基于 BTPT4F-BO 的 OSC 提供了 15.0% 的显着 PCE。高 PCE 和低合成复杂性进一步促成了 BTPT4F-BO 前所未有的品质因数 (FOM = 0.36)。这项工作表明，相对于七环 FREA，A-DA′D-A 型五环 FREA 是未来 OSC 工业制造更具竞争力的候选者。

更新日期：2023-08-21

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