Bandgap Engineering of Lead-Free Double Perovskite Cs2AgInCl6 Nanocrystals via Cu2+-Doping
- 22 September 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 11 (19), 8392-8398
- https://doi.org/10.1021/acs.jpclett.0c02553
Abstract
Lead-free double perovskites (DPs) with excellent moisture, light, and heat stability have been explored as alternatives to toxic lead halide perovskite (APbX3) (A for monovalent cation and X for Cl, Br, or I). However, the bandgaps of the current DPs are generally larger and either indirect or direct forbidden, which leads to weak visible light absorption and limitation for photovoltaic and other optoelectronic applications. Herein, we demonstrate the first synthesis of Cu2+-doped Cs2AgInCl6 double perovskite nanocrystals via a facile hot-injection solution approach. The electronic bandgap can be dramatically tuned from ∼3.60 eV (Cs2AgInCl6, parent) to ∼2.19 eV (Cu2+-doped Cs2AgInCl6) by varying the Cu2+ doping amount. We conclude that the decrease of bandgap is attributed to the overlap of the Ag-d/In-p/Cl-p orbitals and the Cu-3d orbitals in the valence band. The wide tunability of the optical and electronic properties makes Cu2+-Doped Cs2AgInCl6 DP NCs promising candidates for future optoelectronic device applications.Keywords
Funding Information
- National Natural Science Foundation of China (21606052, 21965003)
- The Innovation Project of Guangxi Gradyate Education (YCBZ2019011)
- the Open foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University (2019GXYSOF04)
This publication has 49 references indexed in Scilit:
- Blue upconversion emission of Cu2+ ions sensitized by Yb3+-trimers in CaF2Journal of Materials Chemistry C, 2016
- Lead-Free MA2CuClxBr4–x Hybrid PerovskitesInorganic Chemistry, 2016
- Heterovalent Dopant Incorporation for Bandgap and Type Engineering of Perovskite CrystalsThe Journal of Physical Chemistry Letters, 2016
- Multicolor tunable emission induced by Cu ion doping of perovskite zirconateJournal of Luminescence, 2015
- Temperature- and Component-Dependent Degradation of Perovskite Photovoltaic Materials under Concentrated SunlightThe Journal of Physical Chemistry Letters, 2015
- New Visible Light Absorbing Materials for Solar Fuels, Ga(Sbx)N1−xAdvanced Materials, 2014
- Brightening of carbon nanotube photoluminescence through the incorporation of sp3 defectsNature Chemistry, 2013
- Local Symmetry of Cu2+Ions in Sodium Silicate Glasses from Data of EPR SpectroscopyGlass Physics and Chemistry, 2004
- Reduction characteristics of copper oxide in cerium and zirconium oxide systemsApplied Catalysis A: General, 1998
- Red Shift of Photoluminescence and Absorption in Dilute GaAsN Alloy LayersJapanese Journal of Applied Physics, 1992