Details

Autor(en) / Beteiligte

• Yao, Ming‐Ming
• Zhang, Qun
• Wang, Dan
• Chen, Ren‐li
• Yin, Yi‐Chen
• Xia, Jun
• Tang, Heng
• Xu, Wei‐Ping
• Yu, Shu‐Hong

Titel

Lead‐Free Halide CsAg2I3 with 1D Electronic Structure and High Stability for Ultraviolet Photodetector

Ist Teil von

• Advanced functional materials, 2022-07, Vol.32 (28), p.n/a

Ort / Verlag

Hoboken: Wiley Subscription Services, Inc

Erscheinungsjahr

2022

Quelle

Wiley Online Library

Beschreibungen/Notizen

• Lead halide perovskites have gained extensive attention in the photodetectors (PDs) field, but the problems of intrinsic toxicity and poor stability still hamper their practical applications. Furthermore, ultraviolet (UV) PDs have rarely been explored due to challenges, including the lack of suitable materials and the costly and complicated fabrication processes. In order to solve the above problems, herein it is reported a novel all‐inorganic lead‐free halide CsAg2I3 single crystal (SC) with pure phase and high quality. This CsAg2I3 SC shows ultra‐stable crystal structure, steady chemical properties, and good optical properties, and it can be stable up to 893 K. Its 1D crystal structure and soft crystal lattice support the formation of self‐trapped excitons, leading to a broadband emission at 610 nm with a large Stokes shift of 315 nm (2.23 eV). The strong absorption for UV light combined with direct bandgap, large Stokes shift, and ultra‐high stability promises an environment‐friendly, low‐cost, and high‐performance UV PD based on the 1D all‐inorganic silver (I) halides. A novel all‐inorganic lead‐free 1D CsAg2I3 single crystal with phase‐purity, high quality, and excellent stability is successfully prepared. Its photophysical properties are systematically researched, and optical recombination mechanisms are further revealed. Based on the environmentally friendly and stable CsAg2I3, a nontoxic, low‐cost, and fast response ultraviolet photodetector is demonstrated.