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129th General Meeting of Korean Chemical Society & Exposition Stability and Efficiency Enhancement of Perovskite Solar Cells using Phenyltriethylammonium Iodide

Submission Date :
2 / 28 / 2022 , 15 : 03 : 17
Abstract Number :
129022827268
Presenting Type:
Poster Presentation
Presenting Area :
Material Chemistry
Authors :
Srikanta Palei, Kwanyong Seo1,*, Hyungwoo Kim1, Devendra Singh2
School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), India
1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Korea
2School of Energy and Chemical Engineerig, Ulsan National Institute of Science and Technology, Korea
Assigned Code :
MAT.P-679 Assigend Code Guideline
Presenting Time :
April 14 (THU) 11:00~13:00
Controlling the perovskite film surface is key to improving both the stability and photovoltaic performance of perovskite solar cells. In particular, surface defects on the perovskite films, which are fundamental issues, must be passivated. In this work, we present a two-dimensional (2D) organic material phenyltriethylammonium iodide (PTEAI) to passivate a three-dimensional (3D) (FAPbI3)1-x(MAPbBr3)x perovskite film surface. PTEAI forms a well-matched conformal layer on the perovskite film, protecting the film surface from moisture by preventing the escape of organic ions from the film. The N+ cations and I- anions in PTEAI form bonds with the locally charged perovskite surface, reducing the surface defect density as well as the impeding non-radiative recombination while enhancing carrier lifetimes. We demonstrate that these PTEAI features facilitate significant enhancements in both the open-circuit voltage (Voc) and fill factor (FF) of the perovskite solar cells. As a result, the champion PTEAI-based perovskite solar cell exhibits the highest power conversion efficiency of 20.2% compared with 18.8% by the pristine device. Additionally, the PTEAI-treated device retains 92% of its initial efficiency after being stored in ambient air at room temperature and a relative humidity of 40–60% for 500 hours without encapsulation.