Work

Strain-Induced Large Exciton Energy Shifts in Buckled CdS Nanowires

Year: 2013

Type: article

Abstract: Strain engineering can be utilized to tune the fundamental properties of semiconductor materials for applications in advanced electronic and photonic devices. Recently, the effects of large strain on the properties of nanostructures are being intensely investigated to further expand our insights into the physics and applications of such materials. In this Letter, we present results on controllable buckled cadmium-sulfide (CdS) optical nanowires (NWs), which show extremely large energy bandgap tuning by >250 meV with applied strains within the elastic deformation limit. Polarization and spatially resolved optical measurements reveal characteristics related to both compressive and tensile regimes, while microreflectance spectroscopy clearly demonstrates the effect of strain on the different types of excitons in CdS. Our results may enable strained NWs-based optoelectronic devices with tunable optical responses.

Source: Nano Letters

DOI: 10.1021/nl401860f

Authors: Liaoxin Sun, Do Hyun Kim, Kyu Hwan Oh, Ritesh Agarwal

Institutions: University of Pennsylvania, Seoul National University

Language: English

Topic: Quantum Dots Synthesis And Properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Institutes of Health, National Center for Chronic Disease Prevention and Health Promotion

Awards: G2611060490, OPTOELECTRONIC NANOWIRE PROBES FOR INVESTIGATION OF INTRA-CELLULAR PROCESSES