TY - JOUR
T1 - Vanishing Confinement Regime in Terahertz HgTe Nanocrystals Studied under Extreme Conditions of Temperature and Pressure
AU - Pierini, Stefano
AU - Capitani, Francesco
AU - Scimeca, Michael
AU - Kozlov, Sergei
AU - Pierucci, Debora
AU - Alchaar, Rodolphe
AU - Abadie, Claire
AU - Khalili, Adrien
AU - Cavallo, Mariarosa
AU - Dang, Tung Huu
AU - Zhang, Huichen
AU - Bossavit, Erwan
AU - Gréboval, Charlie
AU - Avila, José
AU - Baptiste, Benoit
AU - Klotz, Stefan
AU - Sahu, Ayaskanta
AU - Feuillet-Palma, Cheryl
AU - Xu, Xiang Zhen
AU - Ouerghi, Abdelkarim
AU - Ithurria, Sandrine
AU - Utterback, James K.
AU - Sauvage, Sebastien
AU - Lhuillier, Emmanuel
N1 - Funding Information:
The project is supported by ERC starting grant blackQD (Grant 756225). The authors acknowledge the use of clean-room facilities of “Centrale de Proximité Paris-Centre”. This work has been supported by the Region Ile-de-France in the framework of DIM Nano-K (Grant dopQD). This work was supported by French state funds managed by the ANR within the Investissements d’Avenir program under reference ANR-11-IDEX-0004-02 and more specifically within the framework of the Cluster of Excellence MATISSE and also by grants from IPER-Nano2 (ANR-18CE30-0023-01), Copin (ANR-19-CE24-0022), Frontal (ANR-19-CE09-0017), Graskop (ANR-19-CE09-0026), NITQuantum (ANR-20-ASTR-0008-01), Bright (ANR-21-CE24-0012-02), MixDferro (ANR-21-CE09-0029), and Quickterra (ANR-22-CE09). M.S. and A.S. acknowledge support by the U.S. National Science Foundation under Grant ECCS-1809064 and the U.S. Department of Defense Office of Naval Research under Grant N00014-20-1-2231, respectively.
Publisher Copyright:
© 2022 American Chemical Society.
PY - 2022/8/4
Y1 - 2022/8/4
N2 - While HgTe nanocrystals (NCs) in the mid-infrared region have reached a high level of maturity, their far-infrared counterparts remain far less studied, raising the need for an in-depth investigation of the material before efficient device integration can be considered. Here, we explore the effect of temperature and pressure on the structural, spectroscopic, and transport properties of HgTe NCs displaying an intraband absorption at 10 THz. The temperature leads to a very weak modulation of the spectrum as opposed to what was observed for strongly confined HgTe NCs. HgTe NC films present ambipolar conduction with a clear prevalence of electron conduction as confirmed by transistor and thermoelectric measurements. Under the application of pressure, the material undergoes phase transitions from the zinc blende to cinnabar phase and later to the rock salt phase which we reveal using joint X-ray diffraction and infrared spectroscopy measurements. We discuss how the pressure existence domain of each phase is affected by the particle size.
AB - While HgTe nanocrystals (NCs) in the mid-infrared region have reached a high level of maturity, their far-infrared counterparts remain far less studied, raising the need for an in-depth investigation of the material before efficient device integration can be considered. Here, we explore the effect of temperature and pressure on the structural, spectroscopic, and transport properties of HgTe NCs displaying an intraband absorption at 10 THz. The temperature leads to a very weak modulation of the spectrum as opposed to what was observed for strongly confined HgTe NCs. HgTe NC films present ambipolar conduction with a clear prevalence of electron conduction as confirmed by transistor and thermoelectric measurements. Under the application of pressure, the material undergoes phase transitions from the zinc blende to cinnabar phase and later to the rock salt phase which we reveal using joint X-ray diffraction and infrared spectroscopy measurements. We discuss how the pressure existence domain of each phase is affected by the particle size.
UR - http://www.scopus.com/inward/record.url?scp=85135597948&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85135597948&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.2c01636
DO - 10.1021/acs.jpclett.2c01636
M3 - Article
C2 - 35867700
AN - SCOPUS:85135597948
SN - 1948-7185
VL - 13
SP - 6919
EP - 6926
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 30
ER -