Near Room Temperature Solvothermal Growth of Ferroelectric CsPbBr3 Nanoplatelets with Ultralow Dark Current

• Published in: Advanced materials (Weinheim) Vol. 36; no. 36; pp. e2403875 - n/a
• Main Authors: Anilkumar, Gokul M., Bhakar, Monika, Taneja, Chetna, Hwang, Sooyeon, Kumar, G. V. Pavan, Sheet, Goutam, Rahman, Atikur
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.09.2024; Wiley
• Subjects: Crystal growth; Crystallization; CsPbBr3; Dark current; ENERGY STORAGE; ferroelectric crystals; Ferroelectric materials; Ferroelectricity; Light emitting diodes; nanoplatelets; Optical properties; Optical switching; Optoelectronic devices; Photovoltaic cells; piezoresponse force microscopy; Platelets (materials); Quantum dots; Room temperature; Second harmonic generation; Solar cells; solvothermal technique; Thermal stability
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.202403875

CsPbBr3 exhibits outstanding optoelectronic properties and thermal stability, making it a coveted material for detectors, light‐emitting diodes, and solar cells. Despite observations of ferroelectricity in CsPbBr3 quantum dots, synthesizing bulk ferroelectric CsPbBr3 crystals has remained elusive, hindering its potential in next‐generation optoelectronic devices like optical switches and ferroelectric photovoltaics. Here, a breakthrough is reported: a novel solvothermal technique enabling the growth of ferroelectric CsPbBr3 nanoplatelets with lateral dimensions in the tens of micrometers. This represents a significant step toward achieving large‐area ferroelectric CsPbBr3 crystals. Unlike traditional methods, this approach allows for growth and crystallization of CsPbBr3 in alcohol solutions by enhancing precursor solubility. This study confirms the ferroelectric nature of these nanoplatelets using second harmonic generation, electrical characterizations, and piezoresponse force microscopy. This work paves the way for utilizing ferroelectric CsPbBr3 in novel optoelectronic devices, significantly expanding the potential of this material and opening doors for further exploration in this exciting field. Ferroelectric CsPbBr3 nanoplatelets with exceptional optical properties and ultralow dark current are synthesized via a near‐room temperature solvothermal method by enhancing precursor solubility in alcohol. These nanoplatelets, with dimensions in the tens of micrometers, show potential for use in advanced optoelectronic devices, including optical switches and ferroelectric photovoltaics, by combining ferroelectricity with the inherent properties of CsPbBr3.