Growth of wurtzite CdTe nanowires on fluorine-doped tin oxide glass substrates and room-temperature bandgap parameter determination

Abstract

The growth of CdTe nanowires, catalyzed by Sn, was achieved on fluorine-doped tin oxide glass by physical vapor transport. CdTe nanowires grew along the 〈0001〉 direction, with a very rare and phase-pure wurtzite structure, at 290 °C. CdTe nanowires grew under Te-limited conditions by forming SnTe nanostructures in the catalysts and the wurtzite structure was energetically favored. By polarization-dependent and power-dependent micro-photoluminescence measurements of individual nanowires, heavy and light hole-related transitions could be differentiated, and the fundamental bandgap of wurtzite CdTe at room temperature was determined to be 1.562 eV, which was 52 meV higher than that of zinc-blende CdTe. From the analysis of doublet photoluminescence spectra, the valence band splitting energy between heavy hole and light hole bands was estimated to be 43 meV.

Facile Synthesis of One-Dimensional van der Waals SbPS4 Nanostructures via Vapor Transport and Negative Thermal Quenching in Photoluminescence

“…We observed two discernible peaks denoted as Q1 (205 cm –1 ) and Q2 (315 cm –1 ) by Lorentzian deconvolution in comparison with the Raman spectra (Figure e). Q1 and Q2 could be assigned to the B 1g and B 2g vibrational modes, which are prominent in Sb 2 S 3 crystals. , This finding is in agreement with the XRD observation (Figure c), suggesting the formation of a non-stoichiometric Sb 2 S 3 matrix under the P-deficient condition.…”

“…Therefore, exploring another method to synthesize SbPS 4 with high quality and yield is essential. Among the feasible methods for growing single-crystalline nanostructures, the chemical vapor transport method has many advantages that allow the growth of large, high-quality crystals with excellent purity and uniformity within a few hours. − Several 1D van der Waals nanowires with superior properties, such as Sb 2 S 3 , , Sb 2 Se 3 , Bi 2 S 3 , , GeS, , and GaS, have been successfully demonstrated by the vapor transport method.…”

Polarization and magneto-optical properties of excitonic emission from wurtzite CdTe/(Cd,Mg)Te core/shell nanowires

“…While explored rather thoroughly in III-V semiconductor based systems, only a handful of reports touch this subject in II-VI semiconductors [24][25][26][27][28]. This is particularly true in the case of cadmium telluride, a II-VI semiconductor, which usually appears in ZB crystalline structure.…”

“…On the other hand, there is a limited number of reports about the properties of cadmium telluride with WZ crystalline structure. In one of these reports [26] the general characterization of nanowires with diameters larger than 500 nm grown by Sn-catalysts assisted physical vapour transport together with room temperature WZ CdTe bandgap parameters is reported. In another approach relatively large nanocrystals obtained by a sol-gel process are investigated by photoluminescence and absorption spectroscopy revealing the optical band gap and crystal field splitting in these structures [31].…”

Zn3P2 Twinning Superlattice Nanowires Grown on Fluorine-Doped Tin Oxide Glass Substrates

“…We have reported various nanowires under Sn catalysis on fluorine-doped tin oxide (FTO) substrates, which are widely used as transparent conducting substrates. − Nanostructures on transparent conducting glass substrates would have practical advantages for use in thin-film optoelectronic devices. Considering the similar material properties of Sn and In (their melting temperatures are 505 and 430 K, respectively), it is essential to explore the possibility of TSL formation in Zn 3 P 2 on FTO substrates.…”