Transport of Dipolar Excitons at the Type-II Polytype Interface of InP Platelets
Jash, Asmita LU ; Lehmann, Sebastian LU ; Dick, Kimberly A. LU ; Gustafsson, Anders LU
and Pistol, Mats Erik
LU
(2024)
In Journal of Physical Chemistry C
128(46).
p.19750-19757
- Abstract
The pursuit of high charge carrier mobility in nanostructures is crucial for advancing both device development and exploring fundamental physics. This study focuses on minimizing scattering to achieve high mobility, employing a polytype type-II interface formed between wurtzite and zincblende InP. On the zincblende side, electrons accumulate, while holes gather on the wurtzite side, resulting in the creation of spatially separated indirect excitons with aligned dipoles. The perfectly flat polytype type-II interface serves to minimize scattering. Furthermore, modulation doping is implemented to reduce Coulomb scattering, achieved by doping the entire wurtzite segment n-type, excluding the vicinity of the interface. The investigation... (More)
The pursuit of high charge carrier mobility in nanostructures is crucial for advancing both device development and exploring fundamental physics. This study focuses on minimizing scattering to achieve high mobility, employing a polytype type-II interface formed between wurtzite and zincblende InP. On the zincblende side, electrons accumulate, while holes gather on the wurtzite side, resulting in the creation of spatially separated indirect excitons with aligned dipoles. The perfectly flat polytype type-II interface serves to minimize scattering. Furthermore, modulation doping is implemented to reduce Coulomb scattering, achieved by doping the entire wurtzite segment n-type, excluding the vicinity of the interface. The investigation particularly focuses on understanding the impact of doping on the spatial distribution of indirect excitons at polytype type-II heterointerfaces. Spatially and temporally resolved photoluminescence spectroscopy at low temperatures is utilized to explore the spatial distribution and recombination dynamics of indirect excitons. The study reveals a significantly reduced spatial distribution and enhanced recombination rate of indirect excitons in the presence of an electron background for the n-type doped platelets compared to the undoped platelets. This aligns with expectations due to enhanced recombination rates provided by numerous electrons. Additionally, we were able to estimate a lower limit for the expansion speed of the indirect excitons at high excitation power density in undoped platelets.
(Less)
- author
- Jash, Asmita
LU
; Lehmann, Sebastian
LU
; Dick, Kimberly A.
LU
; Gustafsson, Anders
LU
and Pistol, Mats Erik
LU
- organization
- publishing date
- 2024-11-21
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physical Chemistry C
- volume
- 128
- issue
- 46
- pages
- 8 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85208919588
- ISSN
- 1932-7447
- DOI
- 10.1021/acs.jpcc.4c05692
- language
- English
- LU publication?
- yes
- id
- 752bea9b-9acd-416a-b480-72ceaa19e5f0
- date added to LUP
- 2025-01-09 09:00:36
- date last changed
- 2025-06-23 12:00:35
@article{752bea9b-9acd-416a-b480-72ceaa19e5f0,
abstract = {{<p>The pursuit of high charge carrier mobility in nanostructures is crucial for advancing both device development and exploring fundamental physics. This study focuses on minimizing scattering to achieve high mobility, employing a polytype type-II interface formed between wurtzite and zincblende InP. On the zincblende side, electrons accumulate, while holes gather on the wurtzite side, resulting in the creation of spatially separated indirect excitons with aligned dipoles. The perfectly flat polytype type-II interface serves to minimize scattering. Furthermore, modulation doping is implemented to reduce Coulomb scattering, achieved by doping the entire wurtzite segment n-type, excluding the vicinity of the interface. The investigation particularly focuses on understanding the impact of doping on the spatial distribution of indirect excitons at polytype type-II heterointerfaces. Spatially and temporally resolved photoluminescence spectroscopy at low temperatures is utilized to explore the spatial distribution and recombination dynamics of indirect excitons. The study reveals a significantly reduced spatial distribution and enhanced recombination rate of indirect excitons in the presence of an electron background for the n-type doped platelets compared to the undoped platelets. This aligns with expectations due to enhanced recombination rates provided by numerous electrons. Additionally, we were able to estimate a lower limit for the expansion speed of the indirect excitons at high excitation power density in undoped platelets.</p>}},
author = {{Jash, Asmita and Lehmann, Sebastian and Dick, Kimberly A. and Gustafsson, Anders and Pistol, Mats Erik}},
issn = {{1932-7447}},
language = {{eng}},
month = {{11}},
number = {{46}},
pages = {{19750--19757}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Journal of Physical Chemistry C}},
title = {{Transport of Dipolar Excitons at the Type-II Polytype Interface of InP Platelets}},
url = {{http://dx.doi.org/10.1021/acs.jpcc.4c05692}},
doi = {{10.1021/acs.jpcc.4c05692}},
volume = {{128}},
year = {{2024}},
}