Efficient Surface Passivation and Electron Transport Enable Low Temperature-Processed Inverted Perovskite Solar Cells with Efficiency over 20%,ACS Sustainable Chemistry & Engineering

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Efficient Surface Passivation and Electron Transport Enable Low Temperature-Processed Inverted Perovskite Solar Cells with Efficiency over 20%
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-05-25 , DOI: 10.1021/acssuschemeng.0c03087
Helin Wang ₁ , Fu Yang _{1,

2} , Ning Li _{2,

3,

4} , Muhammad Akmal Kamarudin ₅ , Junle Qu ₁ , Jun Song ₁ , Shuzi Hayase ₅ , Christoph J. Brabec _{2,

3}

Affiliation

PCBM is a fullerene derivative, which is commonly employed as an electron transport layer (ETL), and still has some issues to fabricate low temperature-processed perovskite solar cells (PSCs) such as surface trap states, low electron mobility, and extra recombination losses at the perovskite/PCBM interface. Herein, a novel perylene diimide dimer (2FBT2FPDI) is synthesized and employed as an ETL or intermediary layer to overcome these challenges. Owing to its suitable energy levels and high electron mobility, 2FBT2FPDI shows great potential to serve as a promising efficient ETL in the photovoltaic devices. Moreover, 2FBT2FPDI can coordinate with the lead site of the perovskite surface, which helps to heal the surface defects and suppress charge-trapped recombination. Therefore, the performance of PSCs is greatly improved from 17.3 to 20.3%, when 2FBT2FPDI was used as the intermediary layer to assist the growth of the PCBM film. This work presents a new direction through interface engineering with n-type nonfullerene small molecules for low temperature-processed stable and highly efficient inverted PSCs.

中文翻译：

高效的表面钝化和电子传输可实现低温处理的钙钛矿型倒装钙钛矿太阳能电池，效率超过20％

PCBM是一种富勒烯衍生物，通常用作电子传输层（ETL），但在制造低温处理的钙钛矿太阳能电池（PSC）方面仍然存在一些问题，例如表面陷阱态，低电子迁移率和额外的复合损失在钙钛矿/ PCBM界面。本文中，合成了新颖的per二酰亚胺二聚体（2FBT2FPDI），并用作ETL或中间层来克服这些挑战。由于其合适的能级和高电子迁移率，2FBT2FPDI具有巨大的潜力，可以用作光伏器件中有希望的高效ETL。此外，2FBT2FPDI可以与钙钛矿表面的铅位配合，从而有助于修复表面缺陷并抑制电荷捕获的重组。因此，PSC的性能从17.3％大大提高到20.3％，当使用2FBT2FPDI作为中间层来辅助PCBM膜的生长时。这项工作通过与n型非富勒烯小分子的界面工程为低温处理的稳定高效的反向PSC提供了一个新的方向。

更新日期：2020-05-25

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