Amorphous TiO2 Coatings Stabilize Perovskite Solar Cells,ACS Energy Letters

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Amorphous TiO2 Coatings Stabilize Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-08-27 , DOI: 10.1021/acsenergylett.1c01446
Seongrok Seo ₁ , Sooeun Shin ₁ , Eunsoo Kim ₁ , Seonghwa Jeong ₁ , Nam-Gyu Park ₂ , Hyunjung Shin ₁

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Significant progress has been achieved in improving the power conversion efficiency (PCE) of perovskite solar cells (PSCs) for a decade, but the long-term stability is still underdeveloped. In a regular PSC structure, 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)9,9′-spirobifluorene (Spiro-OMeTAD) with Li additives and metal electrodes are widely adopted, which leads to facile degradation under device operating conditions because of ion migration. Herein, we show an interface-engineered stabilization approach to prevent ion migration in PSCs enabled by amorphous (a)-TiO₂ capable of hole transfer grown by atomic layer deposition (ALD). This layer prevents ion migration of Li additives with consequent aggregation as well as metal electrode diffusion into the perovskite layer. Furthermore, the combined layers of Spiro-OMeTAD/a-TiO₂ unprecedentedly promote device efficiency, which is further verified with other organic hole transport layers. Finally, the operational stability of the TiO₂-PSC is substantially improved in comparison to that of the control PSC.

中文翻译：

无定形二氧化钛涂层稳定钙钛矿太阳能电池

十年来，在提高钙钛矿太阳能电池（PSC）的功率转换效率（PCE）方面取得了重大进展，但长期稳定性仍未得到发展。在规则的 PSC 结构中，广泛采用具有锂添加剂和金属电极的2,2',7,7'-四（N，N-二-对甲氧基苯胺）9,9'-螺二芴（Spiro-OMeTAD）。由于离子迁移，在设备操作条件下容易降解。在此，我们展示了一种界面工程稳定化方法，以防止由非晶 ( a )-TiO _{2 实现的}PSC 中的离子迁移能够通过原子层沉积 (ALD) 生长空穴转移。该层防止锂添加剂的离子迁移以及随之而来的聚集以及金属电极扩散到钙钛矿层中。此外，Spiro-OMeTAD/ a -TiO ₂的组合层前所未有地提高了器件效率，这在其他有机空穴传输层中得到了进一步验证。最后，与对照 PSC 相比，TiO ₂ -PSC的操作稳定性显着提高。

更新日期：2021-09-10

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