Dopant-Free Bithiophene-Imide-Based Polymeric Hole-Transporting Materials for Efficient and Stable Perovskite Solar Cells,Advanced Materials

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Dopant-Free Bithiophene-Imide-Based Polymeric Hole-Transporting Materials for Efficient and Stable Perovskite Solar Cells
Advanced Materials ( IF 27.4 ) Pub Date : 2022-10-03 , DOI: 10.1002/adma.202110587
Yuanqing Bai ₁ , Zhisheng Zhou ₁ , Qifan Xue _{1,

2} , Chunchen Liu ₁ , Ning Li ₁ , Haoran Tang ₁ , Jiabin Zhang ₁ , Xinxin Xia ₃ , Jie Zhang ₁ , Xinhui Lu ₃ , Christoph J Brabec ₄ , Fei Huang ₁

Affiliation

The development of hole-transport materials (HTMs) with high mobility, long-term stability, and comprehensive passivation is significant for simultaneously improving the efficiency and stability of perovskite solar cells (PVSCs). Herein, two donor–acceptor (D–A) conjugated polymers PBTI and PFBTI with alternating benzodithiophene (BDT) and bithiophene imide (BTI) units are successfully developed with desirable hole mobilities due to the good planarity and extended conjugation of molecular backbone. Both copolymers can be employed as HTMs with suitable energy levels and efficient defect passivation. Shortening the alkyl chain of the BTI unit and introducing fluorine atoms on the BDT moiety effectively enhances hole mobility and hydrophobicity of the HTMs, leading to improved efficiency and stability of PVSCs. As a result, the organic–inorganic hybrid PVSCs with PFBTI as the HTM deliver a power conversion efficiency (PCE) of 23.1% with enhanced long-term operational and ambient stability, which is one of the best efficiencies reported for PVSCs with dopant-free polymeric HTMs to date. Moreover, PFBTI can be applied in inorganic PVSCs and perovskite/organic tandem solar cells, achieving a high PCE of 17.4% and 22.2%, respectively. These results illustrate the great potential of PFBTI as an efficient and widely applicable HTM for cost-effective and stable PVSCs.

中文翻译：

用于高效稳定钙钛矿太阳能电池的无掺杂联噻吩亚胺基聚合物空穴传输材料

开发具有高迁移率、长期稳定性和全面钝化的空穴传输材料（HTM）对于同时提高钙钛矿太阳能电池（PVSC）的效率和稳定性具有重要意义。在此，由于良好的平面性和分子骨架的扩展共轭，成功开发了具有交替苯并二噻吩（BDT）和联噻吩亚胺（BTI）单元的两种供体 - 受体（D-A）共轭聚合物 PBTI 和 PFBTI，具有理想的空穴迁移率。这两种共聚物都可以用作具有合适能级和有效缺陷钝化的 HTM。缩短 BTI 单元的烷基链并在 BDT 部分引入氟原子可有效增强 HTM 的空穴迁移率和疏水性，从而提高 PVSC 的效率和稳定性。因此，以 PFBTI 作为 HTM 的有机-无机杂化 PVSC 可提供 23.1% 的功率转换效率 (PCE)，并具有增强的长期运行和环境稳定性，这是迄今为止报道的采用无掺杂聚合物 HTM 的 PVSC 的最佳效率之一. 此外，PFBTI可应用于无机PVSCs和钙钛矿/有机串联太阳能电池，分别实现17.4%和22.2%的高PCE。这些结果说明了 PFBTI 作为一种高效且广泛适用的 HTM 的巨大潜力，可用于具有成本效益且稳定的 PVSC。PFBTI可应用于无机PVSCs和钙钛矿/有机串联太阳能电池，分别实现17.4%和22.2%的高PCE。这些结果说明了 PFBTI 作为一种高效且广泛适用的 HTM 的巨大潜力，可用于具有成本效益且稳定的 PVSC。PFBTI可应用于无机PVSCs和钙钛矿/有机串联太阳能电池，分别实现17.4%和22.2%的高PCE。这些结果说明了 PFBTI 作为一种高效且广泛适用的 HTM 的巨大潜力，可用于具有成本效益且稳定的 PVSC。

更新日期：2022-10-03

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