Issue 13, 2016

Geometry strategy for engineering the recombination possibility of excitons in nanowires

Abstract

We proposed a geometry strategy to engineer the radiative recombination possibility and thus the lifetime of excitons in nanowires of some photovoltaic semiconductors by using theoretical analysis and first-principles calculations. We demonstrated that the shape can engineer the symmetry of the wave-functions of band-edge states and influence the radiative recombination possibility. The nanowires need to satisfy the following requirements to forbid the radiative recombination possibility of band-edge excitons: (i) wurtzite structure; (ii) pxy-characterized wave-function of VBM state and (iii) C3v-symmetry shape. The geometrical symmetry results in the pxy-characterized C3v-symmetry wave-function of VBM state and leads to forbidden radiative recombination of band-edge excitons. The geometry strategy offers a flexible proposal to prolong the exciton lifetime, leaving optical absorption impregnable.

Graphical abstract: Geometry strategy for engineering the recombination possibility of excitons in nanowires

Article information

Article type
Paper
Submitted
16 12 2015
Accepted
02 3 2016
First published
03 3 2016

Nanoscale, 2016,8, 7318-7325

Geometry strategy for engineering the recombination possibility of excitons in nanowires

Y. Wang, Y. Zhang, H. Zhu, J. Liu, T. Lian and W. Zhang, Nanoscale, 2016, 8, 7318 DOI: 10.1039/C5NR08934D

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