Self‐Additive Low‐Dimensional Ruddlesden–Popper Perovskite by the Incorporation of Glycine Hydrochloride for High‐Performance and Stable Solar Cells,Advanced Functional Materials

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Self‐Additive Low‐Dimensional Ruddlesden–Popper Perovskite by the Incorporation of Glycine Hydrochloride for High‐Performance and Stable Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-02-19 , DOI: 10.1002/adfm.202000034
Haiying Zheng ₁ , Weiwei Wu ₁ , Huifen Xu _{1,

2} , Fangcai Zheng ₁ , Guozhen Liu _{2,

3} , Xu Pan ₂ , Qianwang Chen _{1,

3}

Affiliation

The recent rise of low‐dimensional Ruddlesden–Popper (RP) perovskites is notable for superior humidity stability, however they suffer from low power conversion efficiency (PCE). Suitable organic spacer cations with special properties display a critical effect on the performance and stability of perovskite solar cells (PSCs). Herein, a new strategy of designing self‐additive low‐dimensional RP perovskites is first proposed by employing a glycine salt (Gly⁺) with outstanding additive effect to improve the photovoltaic performance. Due to the strong interaction between CO and Pb²⁺, the Gly⁺ can become a nucleation center and be beneficial to uniform and fast growth of the Gly‐based RP perovskites with larger grain sizes, leading to reduced grain boundary and increased carrier transport. As a result, the Gly‐based self‐additive low‐dimensional RP perovskites exhibit remarkable photoelectric properties, yielding the highest PCE of 18.06% for Gly (n = 8) devices and 15.61% for Gly (n = 4) devices with negligible hysteresis. Furthermore, the Gly‐based devices without encapsulation show excellent long‐term stability against humidity, heat, and UV light in comparison to BA‐based low‐dimensional PSCs. This approach provides a feasible design strategy of new‐type low‐dimensional RP perovskites to obtain highly efficient and stable devices for next‐generation photovoltaic applications.

中文翻译：

通过加入甘氨酸盐酸盐实现高性能和稳定太阳能电池的自添加低维Ruddlesden-Popper钙钛矿

低尺寸Ruddlesden-Popper（RP）钙钛矿的近期崛起以卓越的湿度稳定性而著称，但它们的功率转换效率（PCE）较低。具有特殊性能的合适有机间隔基阳离子对钙钛矿太阳能电池（PSC）的性能和稳定性显示出至关重要的影响。本文首先提出了一种新的设计自添加低维RP钙钛矿的策略，即采用具有优异添加效果的甘氨酸盐（Gly ⁺）来改善光伏性能。由于CO和Pb ²⁺之间的强相互作用，Gly ⁺可以成为成核中心，有利于晶粒尺寸较大的基于Gly的RP钙钛矿的均匀快速生长，从而导致晶界减小和载流子传输增加。其结果是，该甘氨酸基自添加剂的低维RP钙钛矿显示出显着的光电性能，得到的18.06％为甘氨酸（最高PCE Ñ = 8）的装置和用于甘氨酸15.61％（Ñ= 4）磁滞可忽略不计的设备。此外，与基于BA的低尺寸PSC相比，不带封装的基于Gly的器件对湿气，热和紫外线表现出优异的长期稳定性。这种方法为新型低尺寸RP钙钛矿提供了可行的设计策略，从而为下一代光伏应用获得了高效，稳定的设备。

更新日期：2020-04-14

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