Ha-Neul Kim, Doheon Yoo, Abhishek Sharma, Min-Jae Choi
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引用次数: 0
摘要
碲化银(Ag2Te)胶体量子点(CQDs)由于其窄带隙和低毒性,是一种很有前途的红外半导体材料。然而,在短波红外(SWIR, 900-1700 nm)范围内,合成具有均匀尺寸分布的大尺寸Ag2Te CQDs仍然是一个挑战。在这里,我们提出了一种连续的单体供应策略,可以实现均匀的、大尺寸的cqd,并对生长阶段进行精确控制。持续的单体供应阻碍了单体浓度达到平衡点,使奥斯特瓦尔德成熟成为主要的生长机制。在单体供应和消耗之间达到最佳平衡时,CQDs显示出从2.5到4.6 nm的可控增长,对应于900到1718 nm之间的第一激子峰,而半宽从143减小到62 meV。在1550 nm激光照射下,用这些CQDs制成的SWIR光电探测器的响应率为2.0 mA W-1。
Continuous monomer supply for highly monodisperse Ag2Te colloidal quantum dots for SWIR photodetectors.
Silver telluride (Ag2Te) colloidal quantum dots (CQDs) are promising semiconducting materials for infrared applications due to their narrow band gap and low toxicity. However, synthesizing large-sized Ag2Te CQDs with a uniform size distribution in the short-wave infrared (SWIR, 900-1700 nm) range remains a challenge. Here, we present a continuous monomer supply strategy that achieves homogeneous, large-sized CQDs with precise control over the growth phase. The continuous monomer supply prevents the monomer concentration from reaching the equilibrium point at which Ostwald ripening becomes the dominant growth mechanism. At an optimal balance between monomer supply and consumption, the CQDs exhibit controlled growth from 2.5 to 4.6 nm, corresponding to first excitonic peaks between 900 and 1718 nm, while the half-width at half-maximum decreases from 143 to 62 meV. SWIR photodetectors fabricated with these CQDs demonstrate a responsivity of 2.0 mA W-1 under 1550 nm laser irradiation.