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Synthesis, Structure, and Catalytic Applications for ortho- and meta-Carboranyl Based NBN Pincer-Pd Complexes

Synthesis, Structure, and Catalytic Applications for ortho- and meta-Carboranyl Based NBN Pincer-Pd Complexes

Min Ying Tsang, Clara Viñas, Francesc Teixidor, José Giner Planas*, Nerea Conde, Raul SanMartin, María Teresa Herrero, Esther Domínguez, Agustí Lledós, Pietro Vidossich, and Duane Choquesillo-Lazarte.    Inorg. Chem., 2014, 53 (17), pp 9284–9295

Intraband Absorption in Self-Assembled Ge-Doped GaN/AlN Nanowire Heterostructures

  • Hits: 757

nl-2014-002247 0008

M. BeelerP. HilleJ. SchörmannJ. TeubertM. de la MataJ. ArbiolM. Eickhoff, and E. Monroy*

Nano Lett., Article ASAP

DOI: 10.1021/nl5002247

We report the observation of transverse-magnetic-polarized infrared absorption assigned to the s–pz intraband transition in Ge-doped GaN/AlN nanodisks (NDs) in self-assembled GaN nanowires (NWs). The s–pz absorption line experiences a blue shift with increasing ND Ge concentration and a red shift with increasing ND thickness. The experimental results in terms of interband and intraband spectroscopy are compared to theoretical calculations of the band diagram and electronic structure of GaN/AlN heterostructured NWs, accounting for their three-dimensional strain distribution and the presence of surface states. From the theoretical analysis, we conclude that the formation of an AlN shell during the heterostructure growth applies a uniaxial compressive strain which blue shifts the interband optical transitions but has little influence on the intraband transitions. The presence of surface states with density levels expected for m-GaN plane charge-deplete the base of the NWs but is insufficient to screen the polarization-induced internal electric field in the heterostructures. Simulations show that the free-carrier screening of the polarization-induced internal electric field in the NDs is critical to predicting the photoluminescence behavior. The intraband transitions, on the other hand, are blue-shifted due to many-body effects, namely, the exchange interaction and depolarization shift, which exceed the red shift induced by carrier screening.

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