用于近红外 II 光电探测器的 Ag2Te 胶体量子点,ACS Applied Nano Materials

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用于近红外 II 光电探测器的 Ag2Te 胶体量子点
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-12-02 , DOI: 10.1021/acsanm.1c03030
Jianying Ouyang , Neil Graddage , Jianping Lu , Yufang Zhong , Ta-Ya Chu , Yanguang Zhang , Xiaohua Wu , Oltion Kodra , Zhao Li , Ye Tao , Jianfu Ding

银₂Te 胶体量子点 (QD) 是一种出色的纳米材料，可用于第二个近红外窗口（NIR-II，1000-1700 nm）。然而，具有窄尺寸分布和高光致发光量子产率（PL QY）的合成具有挑战性。在这项研究中，我们系统地研究了影响有机相过程的关键合成参数。我们表明高 Ag/Te 进料比导致更小的尺寸和更高的 PL QY；在 4:1 Ag/Te 进料摩尔比下，加入仲膦导致粒径分布更窄，胶体稳定性优异；在 6:1 Ag/Te 进料摩尔比下，过量的 1-十二烷硫醇作为强配体会减慢成核速度并导致成核较少，导致尺寸分布宽和光学性能差；额外的三辛基膦作为弱配体提供更好的胶体稳定性；另一种弱配体三丁基膦提高了QD胶体稳定性，聚焦尺寸分布，增强了PL QY。非注射方法在放大合成中保持窄的尺寸分布。优化后，比较大的Ag_{获得了 2 个}具有明显激子吸收峰（~1050-1450 nm）和 PL 发射峰 1.3-1.7 μm（QY 高达 6.2%）的 Te QD。NIR-II 光电检测已被证明在 1400 nm 处的响应率为 ~1.5 mA/W。

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Ag2Te Colloidal Quantum Dots for Near-Infrared-II Photodetectors

Ag₂Te colloidal quantum dots (QDs) are an excellent nanomaterial for applications in the second near-infrared window (NIR-II, 1000–1700 nm). However, synthesis with narrow size distribution and high photoluminescence quantum yield (PL QY) is challenging. In this study, we systematically investigate critical synthesis parameters affecting an organic phase process. We show that high Ag/Te feed ratio leads to smaller size and higher PL QY; under 4:1 Ag/Te feed molar ratio, addition of secondary phosphine leads to narrower size distribution and excellent colloidal stability; under 6:1 Ag/Te feed molar ratio, excess 1-dodecanethiol as a strong ligand slows the nucleation and results in fewer nuclei, leading to a broad size distribution and poor optical properties; additional trioctylphosphine as a weak ligand provides better colloidal stability; and another weak ligand tributylphosphine improves QD colloidal stability, focuses size distribution, and enhances PL QY. A noninjection method maintains narrow size distribution in upscaling syntheses. After optimization, relatively large Ag₂Te QDs with distinct excitonic absorption peaks (∼1050–1450 nm) and PL emission peak 1.3–1.7 μm (QY up to 6.2%) were obtained. NIR-II photodetection has been demonstrated with a responsivity of ∼1.5 mA/W at 1400 nm.

更新日期：2021-12-24

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