Highly sensitive DUV-SWIR photodetectors by natural flavonoid-derivative isomers through a multisite chelation strategy
通过多位点螯合策略，利用天然黄酮衍生物异构体制造高灵敏度DUV-SWIR光电探测器
多サイトキレート戦略による天然フラボノイド誘導体イソマーを用いた高感度DUV-SWIR光検出器
자연 플라보노이드 유도체 이성질체를 통한 다중 부위 킬레이션 전략으로 구현된 고감도 DUV-SWIR 광검출기
Fotodetectores altamente sensibles DUV-SWIR mediante isómeros derivados de flavonoides naturales a través de una estrategia de quelación multisitio
Détecteurs de lumière hautement sensibles DUV-SWIR par des isomères dérivés de flavonoïdes naturels via une stratégie de chélation multisite
Высокочувствительные DUV-SWIR фотодетекторы на основе природных изомеров флавоноидных производных с использованием стратегии полисайтовой хелатации
Nan Ding 丁楠 ¹, Donggang Li 李东纲 ¹, Mingyu Yao 姚明宇 ¹, Yanqi Liu 刘延琦 ¹, Hailong Liu 刘海龙 ¹, Guoqiang Fang 方国强 ¹, Ge Zhu 朱革 ¹, Xiaodong Li 李小东 ², Wen Xu 徐文 ¹, Bin Dong 董斌 ¹
¹ Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China
中国 大连 大连民族大学物理与材料工程学院 国家民委新能源与稀土资源利用重点实验室
² College of Information Engineering, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
中国 贵阳 贵州中医药大学信息工程学院
Achieving high crystallization and excellent charge transport in lead halide perovskite is crucial for broadband photodetectors (PDs), but remains a significant challenge. Herein, a series of natural flavonoid-derivative isomers with hydroxy and carbonyl groups are applied to modify perovskite PDs. Unlike the single-point coordination or weak van der Waals interactions commonly observed between organic molecules and perovskite, the multiple functional groups in isomers can form stable chelate ring to "lock" Pb2+, enhancing crystal quality, reducing defects density, and improving stability. Especially, quercetin (QC) modified perovskite achieves the outstanding performance stemming from the coordination of its multisite acidic hydroxyl groups, which creates an optimal stereochemical environment for chelation.
Moreover, the QC treatment imparts more pronounced n-type behavior of perovskite, optimizing the energy alignment and facilitating interfacial charge extraction, thereby improving the sensitivity of PDs. Consequently, a single deep-ultraviolet-to-short-wavelength-infrared PD is fabricated by combining the QC modified perovskite with In0.53Ga0.47As, showing a detectivity of 2.71×1013 Jones and an external quantum efficiency of 189.41%. Furthermore, unencapsulated device retains 98.4% of its initial sensitivity after 50000 ON/OFF cycles. Ultimately, the PD array is constructed for high-resolution pixel-level multispectral imaging.
