ZnO–ZnTe nanocone heterojunctions

Sang Hyun Lee; Zhang, X.-G.; Smith, Barton; Seo, Sung Seok A.; Bell, Zane W.; Jun Xu
May 2010
Applied Physics Letters;5/10/2010, Vol. 96 Issue 19, p193116
Academic Journal
We report heterojunctions made of vertically aligned ZnO–ZnTe nanocones synthesized using a combination of thermal vapor deposition and pulsed-laser deposition. ZnO nanocones and nanorods were controlled by utilizing the growth rate difference between central and boundary sites of precursor domains. The p–n heterojunctions were subsequently formed by growing ZnTe as shells on the nanocone surface. Structural and electric characteristics indicate that nanocones are more feasible than nanorods for forming heterojunction. Furthermore, theoretical modeling demonstrates that the nanocone-based junction exhibits an electrostatic potential profile that is much more effective for carrier transport than the electrostatic potential for the nanorod-based junction.


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