Ambient Condition Mg2+ Doping Producing Highly Luminescent Green- and Violet-Emitting Perovskite Nanocrystals with Reduced Toxicity and Enhanced Stability

• DOI: 10.1021/acs.jpclett.9b03831
• Publication Date: 2020-01-24T17:18:01Z
• Authors: Somnath Das; Apurba De; Anunay Samanta
• Keywords: Passivation; Quantum yield

The lack of long-term stability, the presence toxic lead, and a low photoluminescence (PL) efficiency are major obstacles to commercialization lead-halide perovskite-based optoelectronic photovoltaic devices. Herein we report facile ambient condition doping protocol that addresses all three issues CsPbX3 perovskite nanocrystals (NCs) substantial extent. We show room-temperature treatment these NCs with MgX2 results in partial (18–23%) replacement enhances PL quantum yield green-emitting CsPbBr3 (to ∼100% from ∼51%) violet-emitting CsPbCl3 ∼79% ∼1%), improves stability under conditions light polar solvent. Ultrafast pump–probe temperature-dependent studies reveal curing intrinsic structural disorder, introduction some shallow energy levels close conduction band edge, effective passivation halide deficiency contribute improved properties doped systems.