Zn‐Porphyrin Antisolvent Engineering Enhanced Grain Boundary Passivation for High‐Performance Perovskite Solar Cell
Abdul Kareem Kalathil Soopy, Bhaskar Parida, Assa S. Aravindh, Hiba SahulHameed, Bhabani Sankar Swain, Na’il Saleh, Inas Magdy Abdelrahman Taha, Dalaver Hussain Anjum, Vivian Alberts, Shengzhong (Frank) Liu, Adel Najar- Electrical and Electronic Engineering
- Energy Engineering and Power Technology
- Atomic and Molecular Physics, and Optics
- Electronic, Optical and Magnetic Materials
Perovskite solar cells (PSCs) represent a promising and rapidly evolving technology in the field of photovoltaics due to their easy fabrication, low‐cost materials, and remarkable efficiency improvements over a relatively short period. However, the grain boundaries in the polycrystalline films exhibit a high density of defects, resulting in not only heightened reactivity to oxygen and water but also hampered charge transport and long‐term stability. In this study, we present an approach involving Zn‐porphyrin (Zn‐PP) upgraded anti‐solvent treatment to enhance the grain size and meanwhile passivate grain boundary defects in FA0.95MA0.05PbI2.85Br0.15 perovskites. The Zn‐PP molecules significantly improve structural and optical properties, effectively mitigating defects and promoting carrier transport at the perovskite/hole transport layer interface. The DFT simulation confirms that Zn‐PP forms a strong chemical bonding with the perovskite surface. With the Zn‐PP passivation, the total DOS shifts to higher energy regions with molecular adsorption, especially near the valence and conduction band edges, indicating that there is an increase in conducting properties of the surface with molecular adsorption. The power conversion efficiency (PCE) of PSCs enhanced significantly as a result of this improvement, rising from 15.38% to 19.11%. Moreover, unencapsulated PSCs treated with Zn‐PP exhibit outstanding stability, retaining over 91% of their initial PCE.
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