Surface Defect Recovery in Perovskite Nanocrystals with Excess Halide for Core–Shell Structure

Dong Hyeon Lee; Woo Hyeon Jeong; Seokhyun Choung; Ji Won Jang; Gyudong Lee; Hochan Song; Sanghun Han; Gyeong Eun Seok; Jihoon Kim; Myeonggeun Han; Jeong Woo Han; Hyosung Choi; Jongmin Choi; Bo Ram Lee; Yong-Young Noh

doi:10.1021/acsenergylett.4c01870

journal article·2024-11-08

Surface Defect Recovery in Perovskite Nanocrystals with Excess Halide for Core–Shell Structure

Dong Hyeon Lee, Woo Hyeon Jeong, Seokhyun Choung, Ji Won Jang, Gyudong Lee, Hochan Song, Sanghun Han, Gyeong Eun Seok, Jihoon Kim, Myeonggeun Han, Jeong Woo Han, Hyosung Choi, Jongmin Choi, Bo Ram Lee, Yong-Young Noh

ACS Energy Letters· Volume 9· Issue 11

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Source abstract

Abstract

We present a method to synthesize stable and uniform high-quality perovskite nanocrystals (PNCs) by using excess halide to recover surface defects in CsPbBr 3 /ZnS core/shell nanocrystals. Use of N -bromosuccinimide as a halide donor recovered surface halide vacancies of bare CsPbBr 3 PNCs during the growth of the ZnS shell, as confirmed by DFT calculations. This approach achieves a high photoluminescence quantum yield of nearly 1, and significantly increases the stability of PNCs under adverse conditions such as high humidity and elevated temperature. CsPbBr 3 /ZnS PNC light-emitting diodes demonstrated outstanding luminous characteristics, with a remarkable external quantum efficiency of 12.77% and a maximum luminance of 1449 cd m –2 at 517 nm. These characteristics of the PNCs will have a wide variety of applications and will help enable development of highly efficient optoelectronic devices.

Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemical Engineering

Pohang University of Science and Technology (POSTECH)

School of Advanced Materials Science and Engineering

Sungkyunkwan University

Department of Materials Science and Engineering, Research Institute of Advanced Materials

Seoul National University

Department of Chemistry, Research Institute for Convergence of Basic Sciences, and Research Institute for Natural Science

Hanyang University

Division of Nanotechnology Daegu Gyeongbuk Institute of Science and Technology (DGIST)

DGIST−ETH Microrobotics Research Center

Department of Energy Science and Engineering

Daegu Gyeongbuk Institute of Science and Technology (DGIST)

Department of Materials Science and Engineering

Funding

Daegu Gyeongbuk Institute of Science and Technology · National Research Foundation of Korea

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