Understanding the growth mechanisms of ultrasmall silver selenide quantum dots for short-wave infrared detectors

Dedoping of Intraband Silver Selenide Colloidal Quantum Dots through Strong Electronic Coupling at Organic/Inorganic Hybrid Interfaces

“…NIR-active (∼3 nm) Ag 2 Se CQDs were synthesized based on an adaptation of routes described in our previous reports. , Briefly, 8.75 mL of DDT was mixed with 250 mL of TBT, and 2.565 g of AgNO 3 was dissolved in 250 mL of DI water in two separate containers. After 30 min stirring, the solutions were mixed together and stirred in the dark for 2 h, forming a milky yellow solution.…”

“…In this context, Ag 2 Se is a promising alternative IR semiconductor, having a narrow bulk bandgap of ∼0.05–0.18 eV . As nanoparticles, Ag 2 Se demonstrates extensive photoresponse tunability from the NIR to the long-wave infrared (LWIR) region of the electromagnetic spectrum by varying particle diameter in the range of 2.6–27 nm. − The NIR response emerges from the interband energy transition (“the band gap”, between the 1S h and 1S e states), while the MWIR and LWIR response is perceived to be the result of an intraband energy transition from the 1S e to 1P e state. − Intraband transitions in IR CQDs have been explored more extensively in the Hg chalcogenide literature, − suggesting that energy level filling and stable n-type doping is a result of band edge positions relative to the environmental Fermi level, E F,env . − …”

“…-active (∼3 nm) Ag 2 Se CQDs were synthesized based on an adaptation of routes described in our previous reports 19,23. Briefly, 8.75 mL of DDT was mixed with 250 mL of TBT, and 2.565 g of AgNO 3 was dissolved in 250 mL of…”