Solution-Processed CuCrSe₂ Nanodiscs via a Seeded Growth Mechanism for High-Performance Broadband Photodetection

Layered material CuCrSe₂ has recently attracted increasing attention because of its fascinating superionic, thermoelectric, ferroelectric, and ferromagnetic properties. However, nearly all of the reported synthesis methods for CuCrSe₂ are limited to complicated mechanical exfoliation or chemical vapor deposition. The colloidal synthesis and optoelectronic properties of CuCrSe₂ nanocrystals have rarely been investigated, leaving a critical void in understanding their solution-phase growth and device potential. Herein, the high-quality rhombohedral structure CuCrSe₂ nanodiscs with uniform shape and monodisperse size are first synthesized through a facile one-pot solution bottom-up method. Investigating various reaction parameters, we propose a potential growth pathway of CuCrSe₂ nanodiscs via intermediate formation of Cu_2-xSe seeds. Significantly, the photodetector fabricated from CuCrSe₂ nanodiscs exhibits remarkable broadband response from 450 to 1064 nm wavelengths, achieving excellent stability and a fast response time of 70 ms. This work not only establishes a robust synthetic pathway for non-van der Waals 2D materials but also reveals the promising optoelectronic capabilities of CuCrSe₂ for next-generation devices.