Recent progress in ZnO-based heterojunction ultraviolet light-emitting devices |
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Authors: | Yichun Liu Haiyang Xu Chunyang Liu Weizhen Liu |
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Institution: | 1. Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
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Abstract: | Wide bandgap (3.37 eV) and high exciton-binding energy of ZnO (60 meV) make it a promising candidate for ultraviolet light-emitting diodes (LEDs) and low-threshold lasing diodes (LDs). However, the difficulty in producing stable and reproducible high-quality p-type ZnO has hindered the development of ZnO p–n homojunction LEDs. An alternative strategy for achieving ZnO electroluminescence is to fabricate heterojunction devices by employing other available p-type materials (such as p-GaN) or building new device structures. In this article, we will briefly review the recent progress in ZnO LEDs/LDs based on p–n heterostructures and metal–insulator-semiconductor heterostructures. Some methods to improve device efficiency are also introduced in detail, including the introduction of Ag localized surface plasmons and single-crystalline nanowires into ZnO LEDs/LDs. |
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Keywords: | ZnO Heterojunction Ultraviolet light-emitting devices Progress |
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