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Title: Strain-induced spatially indirect exciton recombination in zinc-blende/wurtzite CdS heterostructures
Authors: Li, Dehui
Liu, Yang
de la Mata, Maria
Magen, Cesar
Arbioi, Jordi
Feng, Yuanping
Xiong, Qihua
Keywords: Science::Physics
Issue Date: 2015
Source: Li, D., Liu, Y., de la Mata, M., Magen, C., Arbiol, J., Feng, Y., & Xiong, Q. (2015). Strain-induced spatially indirect exciton recombination in zinc-blende/wurtzite CdS heterostructures. Nano Research, 8(9), 3035-3044. doi:10.1007/s12274-015-0809-8
Journal: Nano Research
Abstract: Strain engineering provides an effective mean of tuning the fundamental properties of semiconductors for electric and optoelectronic applications. Here we report on how the applied strain changes the emission properties of hetero-structures consisting of different crystalline phases in the same CdS nanobelts. The strained portion was found to produce an additional emission peak on the low-energy side that was blueshifted with increasing strain. Furthermore, the additional emission peak obeyed the Varshni equation with temperature and exhibited the band-filling effect at high excitation power. This new emission peak may be attributed to spatially indirect exciton recombination between different crystalline phases of CdS. First-principles calculations were performed based on the spatially indirect exciton recombination, and the calculated and experimental results agreed with one another. Strain proved to be capable of enhancing the anti-Stokes emission, suggesting that the efficiency of laser cooling may be improved by strain engineering.
ISSN: 1998-0124
DOI: 10.1007/s12274-015-0809-8
Rights: © 2015 Tsinghua University Press and Springer-Verlag Berlin Heidelberg. All rights reserved. This paper was published in Nano Research and is made available with permission of Tsinghua University Press and Springer-Verlag Berlin Heidelberg.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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