Multiple exciton generation boosting over 100% quantum efficiency photoelectrochemical photodetection

IF 15.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2025-06-06 DOI:10.1038/s41467-025-60420-1

Junjun Xue, Xu Wang, Guanyu Xu, Xinya Tao, Tongdao Pan, Zhouyu Chen, Qing Cai, Pengfei Shao, Guofeng Yang, Zengli Huang, Ting Zhi, Ke Wang, Bin Liu, Dunjun Chen, Rong Zhang, Jin Wang

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Abstract

The self-powered photoelectrochemical components themselves featured advancements in operating independently without external supply. Ultimately, due to lack of assistance from the external bias, the photoelectrochemical response is commonly restricted by the deficient photo-quantum efficiency for the absence of carrier multiplication. This work demonstrates a self-powered photoelectrochemical photodetector based on CuO_x/AlGaN nanowires with staggered band structure and enhanced built-in potential for efficient exciton extraction. The generated multiple excitons within reach-through CuO_x layer could be speedily separated before Auger recombination. This yields a 131.5% external quantum efficiency and 270.6 mA W⁻¹ responsivity at 255 nm. The work confirms the role of multiple exciton generation in photoelectrochemical systems, offering a solution on paving path of advance for self-powered optoelectronics and weak-light UV imaging applications.

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多激子产生提高超过100%量子效率的光电化学光探测

自供电的光电化学元件本身具有无需外部电源即可独立工作的特点。最后，由于缺乏外部偏置的帮助，光电化学响应通常受到缺乏载流子倍增的光量子效率的限制。本研究展示了一种基于交错带结构的CuOx/AlGaN纳米线的自供电光电电化学光电探测器，增强了有效提取激子的内置潜力。通过CuOx层产生的多个激子可以在俄歇复合之前快速分离。这产生了131.5%的外量子效率和270.6毫安W−1响应度在255 nm。这项工作证实了多激子产生在光电化学系统中的作用，为自供电光电子学和弱光紫外成像应用的发展铺平了道路。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.