So Young Eom, Haemin Song, Jin Hyeok Lee, Yoon Seo Jung, Gahyeon Kim, Dongsun Choi, Woong Kim* and Kwang Seob Jeong*,
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We present an air-stable mid-infrared (mid-IR) Ag-doped HgTe (Ag-HgTe) colloidal quantum dots (CQDs) synthesized by a newly developed cation-exchange (CE) method in solution phase and mid-IR diode sensors fabricated with the as-synthesized Ag-HgTe quantum dots (QDs). The cation-exchanged p-doped Ag-HgTe CQDs are used for the p–n junction formation with a n-doped HgTe CQDs. Surprisingly, the Ag-HgTe CQDs sustain the optical and physical properties in the colloidal phase under ambient conditions for 900 days. Specific detectivity and noise equivalent temperature difference of the mid-IR QDs photodiode fabricated with the 900 days-stored QDs are measured to be 2.8 × 1010 Jones (broadband) and 12 mK, respectively. The CE Ag-HgTe CQDs are promising p-doped infrared sensing materials for high-performance and reliable infrared optoelectronics.
期刊介绍：
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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