Filterless Near-Infrared Narrowband Photodetectors Based on Mixed Metal Perovskite Single Crystals

IF 8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Advanced Optical Materials Pub Date : 2024-08-14 DOI:10.1002/adom.202401544

Jia Liu, Yifu Chen, Jixuan Zhou, Jinxiang Wang, Zhihui Chen, Lin Zhang, Yu Zhou, Fangping Ouyang, Hongjian Li, Zhengguo Xiao, Bin Yang, Yongbo Yuan, Jun He, Yun Lin

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Abstract

Iodine-based Sn-Pb mixed perovskite single crystals (SCs) are promising candidates for near-infrared (NIR) narrowband photodetectors due to their low bandgaps. However, they are highly defective when grown in ambient air due to the extremely poor air stability of Sn²⁺ ions in precursor solutions. It is discovered that the oxidation of Sn²⁺ to Sn⁴⁺ ions not only consumes Sn²⁺ ions but also increases the precursor solution viscosity. The increased viscosity slows down the solute diffusion and hinders the anisotropic growth of SCs, leading to Sn-Pb perovskite SCs with curved convex surfaces and unevenly distributed composition. By preventing the solute-diffusion-limited growth mode with hypophosphorous acid (H₃PO₂), high-quality Sn-Pb perovskite SCs can be robustly grown in ambient air with low trap density of 6.58 × 10⁹ cm⁻³ and high carrier mobility-lifetime product (µτ) of 1.5 × 10⁻³ cm² V⁻¹. Accordingly, a series of filterless NIR narrowband photodetectors with gradually tuned detection centers and dual detection modes has been achieved, delivering a maximum external quantum efficiency of 15.2% and detectivity of 1.19 × 10¹⁰ Jones.

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基于混合金属过氧化物单晶的无滤光片近红外窄带光电探测器

基于碘的锡铅混合包晶单晶（SC）因其带隙较低而有望成为近红外（NIR）窄带光电探测器的候选材料。然而，由于前驱体溶液中 Sn2+ 离子在空气中的稳定性极差，它们在环境空气中生长时缺陷很大。研究发现，将 Sn2+ 氧化成 Sn4+ 离子不仅会消耗 Sn2+ 离子，还会增加前驱体溶液的粘度。粘度的增加减缓了溶质扩散，阻碍了SC的各向异性生长，导致Sn-Pb包晶SC具有弯曲的凸面和不均匀分布的成分。通过使用次磷酸（H3PO2）阻止溶质扩散受限的生长模式，可以在环境空气中稳健地生长出高质量的锡铅包晶SC，其阱密度低至6.58×109 cm-3，载流子迁移率-寿命积（μτ）高达1.5×10-3 cm2 V-1。因此，一系列无滤光片的近红外窄带光电探测器的检测中心和双检测模式逐渐调谐，实现了 15.2% 的最大外部量子效率和 1.19 × 1010 琼斯的检测率。

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来源期刊

Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS

CiteScore

13.70

自引率

6.70%

发文量

883

审稿时长

1.5 months

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.