Thermally Stable Edge-Functionalized Hexagonal Boron Nitride Quantum Dots for Blue Light Photodetector Applications

IF 4.7 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2025-03-24 DOI:10.1021/acsaelm.5c00291

Debojyoti Ray Chawdhury, Shruti Narayanan, Sugandh Sirohi and Prem Ballabh Bisht*,

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Abstract

Quantum dots (QDs) of hexagonal boron nitride (hBN) synthesized by using the bottom-up approach have been characterized. Significant red shift in the band gap of hBN QDs has been observed on functionalization. Due to better functionalizability, these QDs synthesized by the bottom-up method showed superior blue emission (∼20 times) as compared to the ones obtained by the top-down method. The temperature dependence of the PL shows that the QDs are suitable for use in optoelectronic devices. This is due to their low thermal expansion coefficient, direct band gap, and high activation energy. As an application of this study, a photodetector at 405 nm on silicon (Si) substrate using a silver electrode has been demonstrated. The blue light photodetector shows a responsivity of 11 mA/W, external quantum efficiency of 3.4%, and detectivity of 1.5 × 10⁹ Jones. The device with easy fabrication technique exhibits a faster photoresponse, making it suitable for optoelectronic devices.

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用于蓝光光电探测器的热稳定边缘功能化六方氮化硼量子点

采用自底向上的方法合成了六方氮化硼（hBN）量子点。在功能化过程中观察到hBN量子点的带隙有明显的红移。由于具有更好的功能化性，自下而上方法合成的量子点比自上而下方法合成的量子点具有更好的蓝色发射（~ 20倍）。量子点的温度依赖性表明，量子点适合用于光电器件。这是由于它们的热膨胀系数小，直接带隙大，活化能高。作为本研究的一个应用，在硅（Si）衬底上使用银电极的405 nm光探测器已经被证明。该蓝光光电探测器的响应率为11 mA/W，外量子效率为3.4%，探测率为1.5 × 109 Jones。该器件具有简单的制造技术，具有更快的光响应，适用于光电子器件。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico