Heng Yang, Sizhe Chen, Yi Liu, Qian Zhao, Fangchao Lu, Fengrui Hu, Jing Zhang, Xiaolong Liu
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引用次数: 0
摘要
得益于二维材料的多用途能带结构设计和硅中掺杂物浓度的有效调制,二维/硅杂化异质结构表现出理想的器件性能。氧化硫系铋材料Bi2O2Se具有较高的载流子迁移率和超快的光电动力学特性,当与Si相结合时,器件在光诱导载流子分离和收集方面的效率将得到提高。然而,由于Bi2O2Se和Si的间接带隙特性,异质结构的光吸收效果不理想,使外量子效率恶化。为了解决这个问题,加入了额外的光吸收增强材料(LAEMs),并利用LAEMs内剩余载流子产生的光门控效应进行增强,以牺牲响应速度为代价提高光导增益和光响应性。本研究采用CsPbI3量子点层提供多余载流子,以激子能量转移的形式注入Bi2O2Se/p-Si异质结中。因此,规避了载流子倍增效应,从而提高了光响应性,高达2078 A W−1,同时光电流上升沿和下降沿的特定时间常数加速到267和391µs。
Optoelectrical Performance Enhancement by Integrating CsPbI3 Quantum Dots Layer with Bi2O2Se/Si Photodiodes
Benefiting from the versatile energy band structure design of 2D materials and effective modulation of dopant concentration in Si, 2D/Si hybrid heterostructures demonstrate desirable device performances. Bismuth oxychalcogenide material Bi2O2Se, exhibits high carrier mobility and ultrafast optoelectrical dynamics, when interfaced with Si, the device efficiencies will be improved in the aspects of photo-induced carrier separation and collection. However, due to the indirect bandgap features of Bi2O2Se and Si, the light absorption of the heterostructure is unsatisfactory, deteriorating the external quantum efficiency. To address this, additional light absorption enhancing materials (LAEMs) are incorporated, and boosted with the photo-gating effects generated from the residual carriers within the LAEMs, and photoconductive gain and photoresponsivity are improved at the cost of response speed. In this study, the CsPbI3 quantum dot layer is adopted to provide excess carriers, which are injected into Bi2O2Se/p-Si heterojunction in the form of excitonic energy transfer. The carrier multiplication effect is thus circumvented, leading to an improved photoresponsivity as high as 2078 A W−1, while specific time constants of the rising and falling edges of photocurrent are accelerated to 267 and 391 µs.
期刊介绍:
Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.