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Selective substitution induced anomalous phonon stiffening within quasi-one-dimensional P—P chains in SiP2.
- Source :
- Nano Research; Jan2023, Vol. 16 Issue 1, p1107-1114, 8p
- Publication Year :
- 2023
-
Abstract
- Light-matter interactions in low-dimensional quantum-confined structures can dominate the optical properties of the materials and lead to optoelectronic applications. In anisotropic layered silicon diphosphide (SiP<subscript>2</subscript>) crystal, the embedded quasi-one-dimensional (1D) phosphorus-phosphorus (P—P) chains directly result in an unconventional quasi-1D excitonic state, and a special phonon mode vibrating along the P—P chains, establishing a unique 1D quantum-confined system. Alloying SiP<subscript>2</subscript> with the homologous element serves as an effective way to study the properties of these excitons and phonons associated with the quasi-1D P—P chains, as well as the strong interaction between these quasiparticles. However, the experimental observation and the related optical spectral understanding of SiP<subscript>2</subscript> with isoelectronic dopants remain elusive. Herein, with the photoluminescence and Raman spectroscopy measurements, we demonstrate the redshift of the confined excitonic peak and the stiffening of the phonon vibration mode B<subscript>1g</subscript><superscript>3</superscript> of a series of Si(P<subscript>1−x</subscript>As<subscript>x</subscript>)<subscript>2</subscript> alloys with increasing arsenic (As) compositions. This anomalous stiffening of is attributed to the selective substitution of As atoms for P atoms within the P—P chains, which is confirmed via our scanning transmission electron microscopy investigation. Such optical spectra evolutions with selective substitution pave a new way to understand the 1D quantum confinement in semiconductors, offering opportunities to explore quasi-1D characteristics in SiP<subscript>2</subscript> and the resulting photonic device application. [ABSTRACT FROM AUTHOR]
- Subjects :
- QUASIPARTICLES
ANISOTROPIC crystals
PHONONS
PHOTOLUMINESCENCE
RAMAN spectroscopy
Subjects
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 16
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 161304642
- Full Text :
- https://doi.org/10.1007/s12274-022-4703-x