Nonaromatic Green‐Solvent‐Processable, Dopant‐Free, and Lead‐Capturable Hole Transport Polymers in Perovskite Solar Cells with High Efficiency,Advanced Energy Materials

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Nonaromatic Green‐Solvent‐Processable, Dopant‐Free, and Lead‐Capturable Hole Transport Polymers in Perovskite Solar Cells with High Efficiency
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-01-24 , DOI: 10.1002/aenm.201902662
Junwoo Lee ₁ , Guan‐Woo Kim ₁ , Minjun Kim ₁ , Sang Ah Park ₁ , Taiho Park ₁

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With the recent developments in the efficiency of perovskite solar cells (PSCs), diverse functionalities are necessary for next‐generation charge‐transport layers. Specifically, the hole‐transport layer (HTL) in the various synthesized materials modified with functional groups is explored. A novel donor–acceptor type polymer, alkoxy‐PTEG, composed of benzo[1,2‐b:4,5:b′]dithiophene and tetraethylene glycol (TEG)‐substituted 2,1,3‐benzothiadiazole is reported. The alkoxy‐PTEG exhibits high solubility even in nonaromatic solvents, such as 3‐methylcyclohexanone (3‐MC), and can prevent possible lead leakage via chelation. The optical and electronic properties of alkoxy‐PTEG are thoroughly analyzed. Finally, a dopant‐free alkoxy‐PTEG device processed with 3‐MC exhibits 19.9% efficiency and a device with 2‐methyl anisole, which is a reported aromatic food additive, exhibits 21.2% efficiency in a tin oxide planar structure. The PSC device shows 88% stability after 30 d at ambient conditions (40–50% relative humidity and room temperature). In addition, nuclear magnetic resonance reveals that TEG groups can chelate lead ions with moderate strength (K_binding = 2.76), and this strength is considered to be nondestructive to the perovskite lattice to prevent lead leakage. This is the first report to consider lead leakage and provide solutions to reduce this problem.

中文翻译：

钙钛矿型太阳能电池中的非芳香族绿色溶剂可加工，无掺杂和可捕获铅的空穴传输聚合物

随着钙钛矿太阳能电池（PSC）效率的最新发展，下一代电荷传输层需要多种功能。特别是，探索了用官能团修饰的各种合成材料中的空穴传输层（HTL）。一种新型的供体-受体型聚合物，烷氧基-PTEG，由苯并[1,2-b：4,5：b′]二噻吩和四甘醇（TEG）取代的2,1,3-苯并噻二唑已报道。烷氧基-PTEG即使在非芳族溶剂（例如3-甲基环己酮（3-MC））中也显示出高溶解度，并可以防止由于螯合而导致的铅泄漏。彻底分析了烷氧基-PTEG的光学和电子性质。最后，使用3-MC处理的无掺杂烷氧基-PTEG器件的效率为19.9％，使用2-甲基苯甲醚（已报道为芳香族食品添加剂）的器件在氧化锡平面结构中的效率为21.2％。PSC设备在环境条件（相对湿度和室温为40–50％）下放置30天后显示88％的稳定性。此外，核磁共振表明TEG基团可以螯合铅离子，具有中等强度（K_结合= 2.76），并且该强度被认为对钙钛矿晶格无害，可防止铅泄漏。这是第一份考虑铅泄漏并提供解决方案的报告。

更新日期：2020-02-25

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