Optical signatures of lattice strain in chemically doped colloidal quantum wells

Junhong Yu (), Hilmi Volkan Demir () and Manoj Sharma ()
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Junhong Yu: Chongqing Normal University
Hilmi Volkan Demir: Nanyang Technological University
Manoj Sharma: Nanyang Technological University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Lattice strain plays a vital role in tailoring the optoelectronic performance of colloidal nanocrystals (NCs) with exotic geometries. Although optical identifications of lattice strain in irregular-shaped NCs or hetero-structured NCs have been well documented, less is known about optical signatures of the sparsely distributed lattice mismatch in chemically-doped NCs. Here, we show that coherent acoustic phonons (CAPs) following bandgap optical excitations in Cu-doped CdSe colloidal quantum wells (CQWs) offer a unique platform for indirectly measuring the dopant-induced lattice strain. By comparing the behavior of CAPs in Cu-doped and undoped CQWs (i.e., vibrational phase/lifetime/amplitude), we have revealed the driving force of CAPs related to the optical screening of lattice strain-induced piezoelectric fields, which thus allows to determine the strain-induced piezoelectric field of ~102 V/m in Cu-doped CdSe CQWs. This work may facilitate a detailed understanding of lattice strain in chemically-doped colloidal NCs, which is a prerequisite for the design of favorable doped colloids in optoelectronics.

Date: 2025
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DOI: 10.1038/s41467-025-55984-x

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