Aqueous Preparation of CsPbBr3 Perovskite Nanocrystals Under Ambient Conditio

TL;DR

This paper introduces a sustainable, water-based method for synthesizing CsPbBr3 perovskite nanocrystals at room temperature in ambient air, achieving high photoluminescence and device performance, advancing eco-friendly optoelectronic technology.

Contribution

It presents a novel aqueous synthesis approach for CsPbBr3 nanocrystals that is scalable, environmentally friendly, and effective at ambient conditions, unlike traditional toxic solvent methods.

Findings

Photoluminescence quantum yield exceeds 60%

Photoconductor devices achieve a specific detectivity of 1.2 x 10^11 Jones

Method enables precise size and compositional control

Abstract

Metal halide perovskites (MHPs) have had a profound impact on numerous emerging optoelectronic technologies, achieving performance metrics that rival or exceed incumbent materials. This impact is underpinned by the exceptional properties of MHPs, including tuneable band gaps, high absorption coefficients, long carrier diffusion lengths and combined with uncomplicated synthesis methods. However, current MHP production relies on the toxic solvents, which pose significant environmental and health risks. Moreover, these methods often require complex multi component solvent systems and thermal processing to achieve the desired material phases, further hindering scalability and sustainability. Overcoming these challenges is critical to the future development of MHP-based technologies. Overcoming these challenges is critical to the future development of MHP-based technologies. Here, we present a novel water-based solvent system and synthetic approach for the preparation of size-controlled CsPbBr3 perovskite nanocrystals in ambient air and at room temperature. The photoluminescence quantum yield (PLQY) of CsPbBr3 erovskite nanocrystals (PNCs) exceeds 60 precent. To demonstrate the light to current conversion ability of our PNCs a series of photoconductors were prepared, with the best performing devices achieving a specific detectivity (D*) of 1.2 x 10^11 Jones. Thus, this green, scalable, and low-cost approach offers a sustainable pathway for precise size and compositional control of MHP nanocrystals, opening new possibilities for environmentally friendly optoelectronic applications.