Temperature Dependence of Interband Transitions in Wurtzite InP nanowires

Zilli, A. and De Luca, M. and Tedeschi, D. and Fonseka, A. and Miriametro, A. and Tan, H. and Jagadish, C. and Capizzi, M. and Polimeni, A.. (2015) Temperature Dependence of Interband Transitions in Wurtzite InP nanowires. ACS Nano, 9 (4). pp. 4277-4287.

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Official URL: http://edoc.unibas.ch/41007/

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Semiconductor nanowires (NWs) formed by non-nitride III–V compounds grow preferentially with wurtzite (WZ) lattice. This is contrary to bulk and two-dimensional layers of the same compounds, where only zincblende (ZB) is observed. The absorption spectrum of WZ materials differs largely from their ZB counterparts and shows three transitions, referred to as A, B, and C in order of increasing energy, involving the minimum of the conduction band and different critical points of the valence band. In this work, we determine the temperature dependence (T = 10–310 K) of the energy of transitions A, B, and C in ensembles of WZ InP NWs by photoluminescence (PL) and PL excitation (PLE) spectroscopy. For the whole temperature and energy ranges investigated, the PL and PLE spectra are quantitatively reproduced by a theoretical model taking into account contribution from both exciton and continuum states. WZ InP is found to behave very similarly to wide band gap III-nitrides and II–VI compounds, where the energy of A, B, and C displays the same temperature dependence. This finding unveils a general feature of the thermal properties of WZ materials that holds regardless of the bond polarity and energy gap of the crystal. Furthermore, no differences are observed in the temperature dependence of the fundamental band gap energy in WZ InP NWs and ZB InP (both NWs and bulk). This result points to a negligible role played by the WZ/ZB differences in determining the deformation potentials and the extent of the electron–phonon interaction that is a direct consequence of the similar nearest neighbor arrangement in the two lattices.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Material Physics (Zardo)
UniBasel Contributors:De Luca, Marta
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jun 2016 11:01
Deposited On:12 May 2016 06:58

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