講演情報
[15p-K405-9]Synthesis of Stable Inorganic Colloidal Tin-based Perovskite Nanocrystals via Sn (IV) Control
〇Yusheng Li1, Dandan Wang1, Shuzi Hayase1, Qing Shen1 (1.Faculty of Informatics and Engineering, The University of Electro Communications)
キーワード：
Tin-based Perovskite Nanocrystals、Sn (IV) Control
1. Background and Objective
Inorganic tin (Sn) perovskite nanocrystals (PNCs) have gained attention as a viable substitute for lead (Pb)-based counterparts due to their lower toxicity and similar optoelectronic characteristics. Nevertheless, progress in creating high-quality Sn-based and Sn-Pb alloyed PNCs has been hindered by the oxidation of Sn(II) to Sn(IV), a significant obstacle in Sn-perovskite research.
2. Method details
In this work, we explore the distinct oxygen-driven and solvent-driven oxidation mechanisms of Sn that hinder the advancement of Sn-based PNCs. To overcome this challenge, we propose a synergistic antioxidation strategy utilizing tri-n-octylphosphine (TOP) and micron-sized Sn powder. This method efficiently reduces defect trapping and minimizes lattice distortions in Sn-based PNCs by promoting the removal of Sn(IV).
3. Results and Conclusion
As a result, we successfully produce high-symmetry α-phase CsSnI3 PNCs with an ultra-long carrier lifetime surpassing 200 ns, establishing a new record for 3D Sn perovskites. Additionally, applying this strategy to Sn-Pb alloyed PNCs results in a photoluminescence quantum yield of 35%, the highest reported for Sn > Pb, along with a two-order-of-magnitude enhancement in carrier lifetime. Our results underscore the crucial role of carefully engineered antioxidation strategies in unlocking the full potential of Sn-based PNCs for optoelectronic applications.
Inorganic tin (Sn) perovskite nanocrystals (PNCs) have gained attention as a viable substitute for lead (Pb)-based counterparts due to their lower toxicity and similar optoelectronic characteristics. Nevertheless, progress in creating high-quality Sn-based and Sn-Pb alloyed PNCs has been hindered by the oxidation of Sn(II) to Sn(IV), a significant obstacle in Sn-perovskite research.
2. Method details
In this work, we explore the distinct oxygen-driven and solvent-driven oxidation mechanisms of Sn that hinder the advancement of Sn-based PNCs. To overcome this challenge, we propose a synergistic antioxidation strategy utilizing tri-n-octylphosphine (TOP) and micron-sized Sn powder. This method efficiently reduces defect trapping and minimizes lattice distortions in Sn-based PNCs by promoting the removal of Sn(IV).
3. Results and Conclusion
As a result, we successfully produce high-symmetry α-phase CsSnI3 PNCs with an ultra-long carrier lifetime surpassing 200 ns, establishing a new record for 3D Sn perovskites. Additionally, applying this strategy to Sn-Pb alloyed PNCs results in a photoluminescence quantum yield of 35%, the highest reported for Sn > Pb, along with a two-order-of-magnitude enhancement in carrier lifetime. Our results underscore the crucial role of carefully engineered antioxidation strategies in unlocking the full potential of Sn-based PNCs for optoelectronic applications.