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 Ker. 2015
Accepted
02 Meur. 2016
First published
03 Meur. 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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