Sequential surface tailoring from colloid to solid in Ag2Te colloidal quantum dots enables high hole mobility and efficient shortwave infrared photodetection

IF 16.8 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy Pub Date : 2025-04-28 DOI:10.1016/j.nanoen.2025.111091

Abhishek Sharma , Doheon Yoo , Ha-Neul Kim , Min-Jae Choi

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引用次数: 0

Abstract

Silver telluride (Ag₂Te) colloidal quantum dots (CQDs) are promising semiconducting materials for infrared detection due to their environmentally friendly composition and tunable optical bandgap in the shortwave infrared region. However, a limited understanding of surface chemistry in Ag₂Te CQDs compared to conventional II-VI and IV-VI CQD systems has hindered advancements in device performance. In this study, we present sequential surface tailoring of Ag₂Te CQDs to achieve high-mobility CQD solids. This approach involves the use of a co-ligand system during colloidal synthesis to enhance ligand density and improve surface passivation, followed by iodide solid-state ligand exchange to fabricate all-inorganic Ag₂Te CQD solids. As a result, the CQD solids exhibited the highest hole mobility of 3.78 cm² V⁻¹ s⁻¹ among reported CQD solids. Furthermore, the enhanced carrier mobility, combined with the reduced dark current of these CQD solids, enabled photodetectors to achieve a responsivity of 27.6 mA/W under 1550 nm irradiation.

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Ag2Te胶体量子点从胶体到固体的连续表面剪裁实现了高空穴迁移率和高效的短波红外光探测

碲化银（Ag2Te）胶体量子点（CQDs）由于其环境友好的组成和短波红外区可调谐的光学带隙，是一种很有前途的红外探测半导体材料。然而，与传统的II-VI和IV-VI CQD系统相比，对Ag2Te CQD表面化学的了解有限，阻碍了器件性能的进步。在这项研究中，我们提出了Ag2Te CQD的顺序表面剪裁，以获得高迁移率的CQD固体。这种方法包括在胶体合成过程中使用共配体系统来提高配体密度和改善表面钝化，然后通过碘化物固体配体交换来制造全无机Ag2Te CQD固体。结果表明，CQD固体的空穴迁移率最高，为3.78 cm2 V-1 s-1。此外，载流子迁移率的提高，加上CQD固体的暗电流的降低，使得光电探测器在1550 nm辐照下的响应率达到27.6 mA/W。

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来源期刊

Nano Energy CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

30.30

自引率

7.40%

发文量

1207

审稿时长

23 days

期刊介绍： Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem. Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.