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Optical signatures of lattice strain in chemically doped colloidal quantum wells

Author

Listed:
  • Junhong Yu

    (Chongqing Normal University
    Nanyang Technological University)

  • Hilmi Volkan Demir

    (Nanyang Technological University
    Bilkent University)

  • Manoj Sharma

    (Nanyang Technological University
    Monash University)

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.

Suggested Citation

  • Junhong Yu & Hilmi Volkan Demir & Manoj Sharma, 2025. "Optical signatures of lattice strain in chemically doped colloidal quantum wells," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-55984-x
    DOI: 10.1038/s41467-025-55984-x
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    References listed on IDEAS

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    1. Chenhan Liu & Chao Wu & Xian Yi Tan & Yi Tao & Yin Zhang & Deyu Li & Juekuan Yang & Qingyu Yan & Yunfei Chen, 2023. "Unexpected doping effects on phonon transport in quasi-one-dimensional van der Waals crystal TiS3 nanoribbons," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
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