Perovskite Phase Analysis by SEM Facilitating Efficient Quasi‐2D Perovskite Light‐Emitting Device Designs
Source abstract
Abstract
Abstract The performance of quasi‐2D perovskite light‐emitting devices (PeLEDs) has been greatly improved in the past several years. Characterizations such as transient absorption (TA) spectroscopy and absorption spectra have been widely adopted to confirm the phases in the quasi‐2D perovskite layers. However, all the above‐mentioned characterization techniques could only identify the n values of phases without providing information on the distribution of phases. Here, phase distributions on the quasi‐2D perovskite surfaces are identified by utilizing the charging effect during the scanning electron microscope (SEM) measurement. Then, compositional and antisolvent engineering are adopted to improve the quality of quasi‐2D perovskite films. Green PeLEDs with an external quantum efficiency (EQE) of >20% are achieved with more uniform condensed film morphology and proper phase distribution. The work shows that SEM measurement is a powerful tool for studying the phase distribution on the quasi‐2D perovskite surfaces.
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Research context
OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Conducting polymers and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 China
Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology) Ministry of Education Shenzhen 518055 China
Guangdong‐Hong Kong‐Macao Joint Laboratory for Photonic‐Thermal‐Electrical Energy Materials and Devices Shenzhen Key Lab for Advanced Quantum Dot Display and Lighting and Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China
Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen 518055 China
Funding
National Key Research and Development Program of China · National Natural Science Foundation of China · Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting
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