Band-Gap and Dimensional Engineering in Lead-Free Inorganic Halide Double Perovskite Cs4Cu1-xAg2xSb2Cl12 Single Crystals and Nanocrystals

• Main Authors: Han, P. (Author), Hou, J. (Author), Li, C. (Author), Lu, R. (Author), Luo, C. (Author), Yu, Y. (Author), Zhou, W. (Author)
• Format: Article
• Language: English
• Published: Frontiers Media S.A. 2022
• Subjects: Absorbing materials; Alloying; alloying strategy; Alloying strategy; Band gap engineering; band-gap engineering; Chlorine compounds; dimensional engineering; Dimensional engineering; Double perovskites; Energy gap; Infrared devices; Inorganic halides; Lead compounds; Lead-Free; lead-free double perovskite; Lead-free double perovskite; light absorbing material; Light absorbing material; Nanocrystals; Non-toxic; Optical properties; Perovskite; Single crystals; Toxic materials
• Online Access: View Fulltext in Publisher
• ISBN: 22968016 (ISSN)
• DOI: 10.3389/fmats.2022.855950

Lead free double perovskites (DPs) are promising materials due to their non-toxic and tunable optical properties. In this work, a series of lead-free halide DP single crystals (SCs) and nanocrystals (NCs) (Cs4Cu1-xAg2xSb2Cl12) were reported. With alloying strategy, the optical band-gap engineering was realized and the dimension can be controlled between 2D and 3D. The Cu-alloyed SCs exhibit strong absorption from the UV-visible region to the near-infrared range (can even completely cover the bands of NIR-I and NIR-II). In addition, (Cs4Cu1-xAg2xSb2Cl12) NCs were synthesized via a top-down approach, which maintains similar optical properties and the dimensional transformation phenomenon to SCs. These results suggest the great potential of Cs4Cu1-xAg2xSb2Cl12 SCs and NCs for photovoltaic and optoelectronic applications. Copyright © 2022 Zhou, Han, Luo, Li, Hou, Yu and Lu.