Enhanced Performance of Perovskite Solar Cells via Reactive Post-treatment Process Utilizing Guanidine Acetate as Interface Modifier,Solar RRL

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Enhanced Performance of Perovskite Solar Cells via Reactive Post-treatment Process Utilizing Guanidine Acetate as Interface Modifier
Solar RRL ( IF 6.0 ) Pub Date : 2021-09-09 , DOI: 10.1002/solr.202100547
Pramila Patil ₁ , Dilpreet Singh Mann ₁ , Sachin R. Rondiya ₂ , Nelson Y. Dzade ₂ , Sung-Nam Kwon ₁ , Seok-In Na ₁

Affiliation

Organic–inorganic lead halide perovskites (OIHPs) have emerged as promising materials for next-generation photovoltaics. However, performance improvements in the perovskite-based device are still limited due to defects that exist more intensively on the surface as well as grain boundaries (GBs) and mismatching energy levels at the interface. Herein, a reactive post-treatment process (RPP) using guanidine acetate (GA) is adopted to address defects and interfacial energy level matching at the perovskite surface. The RPP with GA (GA-RPP) results in the formation of an improved perovskite layer with large grain size and low GB density, leading to the formation of secondary phases on the perovskite surface with appropriate energy levels, resulting in reduced defect density and charge recombination. Furthermore, density functional theory analysis reveals that the Pb-rich secondary phase could improve the conduction of electrons at the perovskite interface. Therefore, the GA-RPP-based perovskite-based solar cell (PSC) shows enhanced performance with 20.4% efficiency and long-term stability.

中文翻译：

通过使用乙酸胍作为界面改性剂的反应后处理工艺提高钙钛矿太阳能电池的性能

有机-无机卤化铅钙钛矿（OIHPs）已成为下一代光伏的有前途的材料。然而，由于表面和晶界 (GB) 上存在更密集的缺陷以及界面处的不匹配能级，基于钙钛矿的器件的性能改进仍然受到限制。在此，采用醋酸胍 (GA) 的反应后处理工艺 (RPP) 来解决钙钛矿表面的缺陷和界面能级匹配问题。具有GA的RPP（GA-RPP）导致形成具有大晶粒尺寸和低GB密度的改进的钙钛矿层，导致在钙钛矿表面形成具有适当能级的第二相，从而降低缺陷密度和电荷重组。此外，密度泛函理论分析表明，富铅二次相可以改善钙钛矿界面处电子的传导。因此，基于 GA-RPP 的钙钛矿基太阳能电池 (PSC) 表现出增强的性能，效率为 20.4%，长期稳定性更高。

更新日期：2021-11-04

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