Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Ag x Se ( x > 2) colloidal quantum dots (CQDs) have recently emerged as a promising environmentally friendly material contender for mid- and long-wave infrared optoelectronics, leveraging their intraband transition (1S e -1P e ). However, multicarrier interactions in CQDs, particularly Auger recombination, have profound implications on the optoelectronic properties of the materials and their potential in device applications. Understanding the intraband excited-state dynamics in n-doped Ag x Se is therefore essential for the assessment and successful implementation of this material platform in devices. We, herein, investigate the carrier dynamics of Ag x Se in both solution and thin-film states using a femtosecond mid-infrared transient absorption spectrometer. Our observations reveal that the multicarrier Auger process depends on the degree of doping in Ag x Se CQDs and accelerates when the Fermi energy ( E F ) level approaches the 1P e state. The calculated intraband Auger coefficients ( C A ) are measured to be on the order of ∼10 –28 cm 6 s –1, significantly larger compared to analogous n-doped HgS/Se CQDs.
Source: Nano Letters
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G1908469581, G2262748287, G2763573136, G3005324705, G3480869486, G3581460052, G3681454997, G4042783231, G425668148, G4937468798, Mid- and Long-wave infrared Colloidal Quantum Dot Optoelectronics, G6482940084, G6656126374, G683931746, G7084143925, G7169023097, G8180681537, Next generation environmentally friendly intraband active colloidal quantum dots and their ultrafast carrier dynamics for mid infrared photodetector
OpenAlex ID: W4403813388