The Insolubility Problem of Organic Hole-Transport Materials Solved by Solvothermal Technology: Toward Solution-Processable Perovskite Solar Cells,ACS Applied Materials & Interfaces

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The Insolubility Problem of Organic Hole-Transport Materials Solved by Solvothermal Technology: Toward Solution-Processable Perovskite Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-01-26 , DOI: 10.1021/acsami.1c24035
Jian Yao ₁ , Jian Kong ₁ , Wenying Shi ₁ , Chao Lu ₁

Affiliation

Generally, the high efficiency of solution-processable perovskite solar cells (PSCs) comes at the expense of using expensive organic matters as a hole-transport material (HTM). Although intense efforts have tried to use commercially available and low-cost macrocyclic molecules as HTM candidates, they still face two enormous challenges: poor solubility and inherent instability. Here, solvothermal treatment for old and insoluble HTMs (phthalocyanine (Pc) and its derivatives) has been proposed, which is unusual due to the occurrence of solubilization for insoluble precursors induced by the carbonization of the dissolved part. Since the macrocyclic structure still exists, the as-prepared new-type carbon dots not only retain the capacity of hole transfer but serve as an effective passivation additive. Synergy makes the all-air-processed carbon-based PSCs (CH₃NH₃PbI₃) fabricated with carbon dots achieve a decent power conversion efficiency of 13.7%. Importantly, organics have undergone solvothermal treatment, completely breaking through the instability bottleneck, which exists in the long-term operation of PSCs. The universality of this methodology will usher exploration into other low-cost insoluble organics and drastically enhance the high-performance cost ratio of PSC equipment.

中文翻译：

溶剂热技术解决有机空穴传输材料的不溶性问题：迈向可溶液加工的钙钛矿太阳能电池

通常，可溶液加工的钙钛矿太阳能电池 (PSC) 的高效率是以使用昂贵的有机物作为空穴传输材料 (HTM) 为代价的。尽管已经努力尝试使用市售和低成本的大环分子作为 HTM 候选物，但它们仍然面临两个巨大的挑战：溶解度差和固有的不稳定性。在这里，已经提出了对旧的和不溶性 HTM（酞菁 (Pc) 及其衍生物）进行溶剂热处理，这是不寻常的，因为溶解部分的碳化导致不溶性前体发生溶解。由于大环结构仍然存在，所制备的新型碳点不仅保留了空穴转移的能力，而且可以作为一种有效的钝化添加剂。_{用碳点制造的3} NH ₃ PbI ₃ ) 实现了 13.7% 的可观功率转换效率。重要的是，有机物经过溶剂热处理，彻底突破了PSC长期运行中存在的不稳定瓶颈。该方法的普遍性将引领对其他低成本不溶性有机物的探索，并大幅提高PSC设备的高性能成本比。

更新日期：2022-02-09

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