Modulating optical properties and interfacial electron transfer of CsPbBr3 perovskite nanocrystals via indium ion and chlorine ion co-doping

Abstract

In this work, we demonstrated an in situ approach for doping CsPbBr3 nanocrystals (NCs) with In3+ and Cl− with a ligand-assisted precipitation method at room temperature. The In3+ and Cl− co-doped NCs are characterized by the powder x-ray diffraction patterns, ultraviolet–visible, photoluminescence (PL) spectroscopy, time-resolved PL (TRPL), ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy. Based on PL and TRPL results, the non-radiative nature of In3+-doping induced localized impurity states is revealed. Furthermore, the impact of In3+ and Cl− doping on charge transfer (CT) from the NCs to molecular acceptors was investigated and the results indicate that the CT at the interface of NCs can be tuned and promoted by In3+ and Cl− co-doping. This enhanced CT is attributed to the enlarged energy difference between relevant states of the molecular acceptor and the NCs by In3+ and Cl− upon co-doping. This work provides insight into how to control interfacial CT in perovskite NCs, which is important for optoelectronic applications.

Dynamics of interfacial charge transfer between CsPbBr3 perovskite nanocrystals and molecular acceptors for photodetection application

“…The excited-state interactions of perovskite NCs are also significantly influenced by the presence of surfactants on the surface of the nanocrystals [29,30]. Multiple strategies, such as the selection of different surface Ligands [31,32], ion doping [33,34], and post-synthesis treatment [35,36], can be used to achieve a longer carrier lifetime and rapid transfer of charge carriers.…”

Research on the stability of luminescence of CsPbBr3 and Mn:CsPbBr3 PQDs in polar solution

“…CsPbX 3 can be doped with heterogeneous metal ions to replace Pb 2+ , thus reducing the amount of Pb. [23][24][25][26] Researchers also gured out that the doped ions can bring about new electric, optical, and magnetic properties. [27][28][29][30] Kim et al reported Ni 2+ -doped CsPbBr 3 PQDs in 2021.…”

Mechanical milling processed highly luminescent Cs–Pb–Br perovskite emitters

“…Hot injection (HI), 15–17 ligand-assisted precipitation (LARP) 18–20 and mechanical milling 21,22 are widely used to prepare high-quality perovskite NCs. Different from the HI and LARP methods, mechanical milling avoided the massive use of organic solvents.…”