Presentation Details
| Mixed EDAI and PEACl Passivation Strategy for Perovskite Solar Cells: Enhancing Performance and Stability Bipin Rijal1, 2, Tara P Dhakal1, 2, 3. 1Center for Autonomous Solar Power (CASP), Binghamton University, Binghamton, NY, USA.2Department of Electrical and Computer Engineering, Binghamton, NY, USA.3Materials Science and Engineering Program, Binghamton, NY, USA |
Abstract
Perovskite solar cells (PSCs) have achieved high power conversion efficiencies, yet their defects passivation and operational stability remain as critical challenges. Organic ammonium halides, such as ethylene diammonium diiodide (EDAI) and phenethyl ammonium chloride (PEACl) have been widely employed for perovskite surface passivation. However, each has their inherent limitations; EDAI provides efficient electronic passivation, but being a small molecule provides limited moisture protection. PEACl in other hand, can form an insulating 2D layers providing moisture protection, but could reduce the efficient charge transport. Hence, passivation layer efficient enough to minimize the interfacial defects without hindering the charge transport is highly sought after. Here, we propose a mixed passivation strategy combining EDAI and PEACl, aiming to synergistically exploit the advantages of both molecules while minimizing their individual drawbacks. This strategy helped to improve the power conversion efficiencies (PCEs) of our PSC devices from around 17% to more than 21%. Along with, the mixed passivation strategy improves the moisture resistance of the perovskite surface resulting in better stability of the PSCs.
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