Bound and Continuum Intersubband Transitions in Colloidal Quantum Wells

Diroll, Benjamin T.; Coropceanu, Igor; Portner, Joshua; Hua, Muchuan; Schaller, Richard D.; Talapin, Dmitri V.

doi:10.1021/acs.nanolett.4c05769

Bound and Continuum Intersubband Transitions in Colloidal Quantum Wells

Journal Article · Sun Feb 02 00:00:00 EST 2025 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.4c05769· OSTI ID:3003872

^[1]; ^[2]; Portner, Joshua ^[2]; Hua, Muchuan ^[1]; Schaller, Richard D. ^[3]; ^[4]

Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
Univ. of Chicago, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM); Northwestern Univ., Evanston, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM); Univ. of Chicago, IL (United States)

Quantum well intersubband transitions are critical for quantum cascade lasers and infrared photodetectors. Control of band offsets allows bound-to-bound intersubband transitions, with confinement of both initial and final states, and bound-to-continuum transitions, in which only the initial state is energetically confined within the potential well. Both types of transitions are also achieved in colloidal CdSe wells by changing the heterostructure shell. Bare wells have narrow intersubband transitions spanning the near-infrared spectrum following effective mass predictions. Atomically precise core/shells enable a readily adjusted potential well for electrons. For CdSe/ZnS, bound-to-bound transitions are narrow and redshift with shell thickness. By contrast, broad bound-to-continuum absorptions are found in CdSe/CdS. Due to small conduction band offsets, higher conduction band states of the well are more delocalized into the CdS shell. In conclusion, these measurements provide unique data to understand the electronic structure of colloidal quantum wells and chart a path to atomically precise optoelectronic materials for the mid-infrared.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 3003872

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 6 Vol. 25; ISSN 1530-6992; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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