A vertically oriented two-dimensional Ruddlesden–Popper phase perovskite passivation layer for efficient and stable inverted perovskite solar cells,Energy & Environmental Science

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A vertically oriented two-dimensional Ruddlesden–Popper phase perovskite passivation layer for efficient and stable inverted perovskite solar cells
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-06-21 , DOI: 10.1039/d2ee00759b
Yunseong Choi ₁ , Donghwan Koo ₁ , Gyujeong Jeong ₁ , Ungsoo Kim ₁ , Hyungmin Kim ₁ , Fuzhi Huang _{2,

3} , Hyesung Park ₁

Affiliation

Two-dimensional Ruddlesden–Popper (RP) phase perovskites are gaining increasing attention for passivating the defects of the bulk absorber layer in perovskite solar cells (PSCs). However, owing to their anisotropic structural features, the RP perovskite orientation substantially influences the charge transport efficiency, and thereby the PSC performance. We demonstrate the use of a highly oriented butylammonium RP perovskite as a surface passivation layer with bottom-up growth on the bulk perovskite absorber layer via vacuum deposition. In this process, the crystal formation time directly affects the crystallographic orientation of the passivation layer. By leveraging the passivating properties and controlled crystallinity, the RP perovskite considerably reduces the trap density of bulk perovskite and enhances the charge transport, reaching 21.4% of power conversion efficiency for vacuum-processed PSCs and improving the operational stability. The proposed passivation strategy allows the growth of highly oriented RP phase perovskite passivation layers toward the development of efficient, stable, and scalable PSCs.

中文翻译：

一种垂直取向的二维Ruddlesden-Popper相钙钛矿钝化层，用于高效稳定的倒置钙钛矿太阳能电池

二维 Ruddlesden-Popper (RP) 相钙钛矿在钝化钙钛矿太阳能电池 (PSC) 中体吸收层的缺陷方面受到越来越多的关注。然而，由于它们的各向异性结构特征，RP 钙钛矿取向显着影响电荷传输效率，从而影响 PSC 性能。我们展示了使用高度取向的丁基铵 RP 钙钛矿作为表面钝化层，通过自下而上生长在块状钙钛矿吸收层上真空沉积。在这个过程中，晶体形成时间直接影响钝化层的晶体取向。通过利用钝化特性和可控的结晶度，RP 钙钛矿显着降低了块状钙钛矿的陷阱密度并增强了电荷传输，使真空处理的 PSC 的功率转换效率达到 21.4%，并提高了操作稳定性。所提出的钝化策略允许高度定向的 RP 相钙钛矿钝化层的生长，以开发高效、稳定和可扩展的 PSC。

更新日期：2022-06-21

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