Surface Defect Recovery in Perovskite Nanocrystals with Excess Halide for Core–Shell Structure
We present a method to synthesize stable and uniform high-quality perovskite nanocrystals (PNCs) by using excess halide to recover surface defects in CsPbBr3/ZnS core/shell nanocrystals. Use of N-bromosuccinimide as a halide donor recovered surface halide vacancies of bare CsPbBr3 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. CsPbBr3/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.
Authors
- Yong‐Young Noh (ORCID: https://orcid.org/0000-0001-7222-2401)
- Gyudong Lee (ORCID: https://orcid.org/0000-0003-2513-0912)
- Hochan Song (ORCID: https://orcid.org/0000-0003-0986-6962)
- Seokhyun Choung (ORCID: https://orcid.org/0000-0002-9912-1544)
- Jeong Woo Han (ORCID: https://orcid.org/0000-0001-5676-5844)
- Hyosung Choi (ORCID: https://orcid.org/0000-0003-4573-9012)
- Myeonggeun Han
- Ji Won Jang
- Sang‐Hun Han (ORCID: https://orcid.org/0000-0002-1492-0225)
- Woo Hyeon Jeong (ORCID: https://orcid.org/0000-0001-8636-6457)
- Gyeong Eun Seok
- Ji-Hoon Kim (ORCID: https://orcid.org/0000-0003-0861-7833)
- Bo Ram Lee (ORCID: https://orcid.org/0000-0002-4670-6717)
- Jongmin Choi (ORCID: https://orcid.org/0000-0001-8904-0946)
- Dong Hyeon Lee
Institutions
- Pohang University of Science and Technology (KR)
- Seoul National University (KR)
- Daegu Gyeongbuk Institute of Science and Technology (KR)
- Center for Micro-BioRobotics (IT)
- Division of Materials Science and Engineering (AU)
- Applied Natural Sciences (US)
- Hanyang University (KR)
- Sungkyunkwan University (KR)
Publication Details
- Journal
- ACS Energy Letters
- Published
- 2024-10-16
- DOI
- https://doi.org/10.1021/acsenergylett.4c01870
- Citations
- 18
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 3.76
Funders
- National Research Foundation of Korea
- Daegu Gyeongbuk Institute of Science and Technology