DataVXACS Energy LettersPaper
journal article·2022-04-08Open access

Overcoming Degradation Pathways to Achieve Stable Blue Perovskite Light-Emitting Diodes

Shuai Yuan, Xiaopeng Zheng, Wan-Shan Shen, Jiakai Liu, Lin-Song Cui, Congcong Zhang, Qi-Sheng Tian, Jun-Jie Wu, Yu-Hang Zhou, Xue-Dong Wang, Zhao-Kui Wang, Peigang Han, Joseph M. Luther, Osman M. Bakr, Liang-Sheng Liao

ACS Energy Letters· Volume 7· Issue 4
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Source abstract

Abstract

Mixed halide (Br/Cl) perovskite nanocrystals (NCs) that represent an advanced blue emitter commonly suffer from spectral instability and poor lifespan; notably, the lack of understanding of the failure mechanisms of these devices has restricted the future progress. Here, we determine that the degradation of CsPbBrxCl3–x NCs containing blue light-emitting diodes (LEDs) is due to the combination of two effects. Cl– drift among adjoining NCs under an electric field is found to induce a Cl-deficient material region in multiple NC layers, which dominates the unstable electroluminescence and causes fast degradation in the corresponding devices. In comparison, the monolayer NC devices that feature restricted anion drift pathways exhibit better operational stability; however, excess hole injection is demonstrated to induce irreversible chlorine loss in NCs. Such a process that largely arises from electrochemical oxidation of Cl– initiates a mild device failure in operation of tens of minutes. Through revealing these mechanisms, we modulate the devices’ construction and operational conditions to achieve a longer lifespan.
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties

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

Affiliations

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, People’s Republic of China

Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China

Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia

National Renewable Energy Laboratory, Golden, Colorado 80401, United States

College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, People’s Republic of China

Funding

Collaborative Innovation Center of Suzhou Nano Science and Technology · Ministry of Science and Technology of the People's Republic of China · Basic Energy Sciences · King Abdullah University of Science and Technology · National Natural Science Foundation of China · Higher Education Discipline Innovation Project · Chinese Academy of Sciences · Collaborative Innovation Center of Suzhou Nano Science & Technology · Suzhou Key Laboratory of Functional Nano & Soft Materials

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