State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China.
College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730000, P. R. China.
Adv Mater. 2018 Jul;30(27):e1800568. doi: 10.1002/adma.201800568. Epub 2018 May 17.
The poor UV, thermal, and interfacial stability of perovskite solar cells (PSCs) makes it highly challenging for their technological application, and has drawn increasing attention to resolving the above issues. In nature, plants generally sustain long exposure to UV illumination without damage, which is attributed to the presence of the organic materials acting as sunscreens. Inspired by the natural phenomenon, a natural plant sunscreen, sinapoyl malate, an ester derivative of sinapic acid, is employed to modify the surface of electron transport materials (ETMs). The interfacial modification successfully resolved the UV stability and reduced the poor interfacial contact between ETM and perovskite. The best efficiency of fabricated PSCs is up to 19.6%. Furthermore, we employed a mixture of Co(II) and Co(III)-based porphyrin compounds containing the excellent Co(II)/Co(III) redox couple to substitute the commonly used hole transport material, 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spiro-bifluorene (spiro-OMeTAD), to resolve the thermal degradation of PSCs noted at and above 80 °C that originates from ion diffusion of I and CH NH (MA ) ions from perovskite into spiro-OMeTAD. Finally, the stable PSCs with the best efficiency up to 20.5% are successfully fabricated.
钙钛矿太阳能电池（PSCs）的紫外线、热和界面稳定性较差，这使得其技术应用极具挑战性，因此越来越多的人关注解决上述问题。在自然界中，植物通常长时间暴露在紫外光下而不会受到伤害，这归因于存在起防晒作用的有机材料。受此自然现象的启发，天然植物防晒霜——芥子酸的酯衍生物——肉桂酰马来酸酯被用来修饰电子传输材料（ETM）的表面。界面修饰成功地解决了紫外线稳定性问题，并减少了 ETM 和钙钛矿之间不良的界面接触。所制备的 PSCs 的最佳效率高达 19.6%。此外，我们采用了一种含有优异 Co(II)/Co(III) 氧化还原对的 Co(II) 和 Co(III)-基卟啉化合物混合物来替代常用的空穴传输材料 2,2',7,7'-四(N,N-二对甲氧基苯基)胺)-9,9-螺二芴（螺-OMeTAD），以解决在 80°C 及以上时 PSCs 中 noted 的热降解问题，该问题源于钙钛矿中的 I 和 CH NH (MA )离子向 spiro-OMeTAD 的离子扩散。最终，成功制备了具有最佳效率高达 20.5%的稳定 PSCs。
