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Title: Steady state and time resolved optical characterization studies of Zn2SnO4 nanowires for solar cell applications

Abstract

Nanowires are a promising option for sensitized solar cells, sensors, and display technology. Most of the work thus far has focused on binary oxides for these nanowires, but ternary oxides have advantages in additional control of optical and electronic properties. Here, we report on the diffuse reflectance, Low Temperature and Room Temperature Photoluminescence (PL), PL excitation spectrum, and Time Resolved PL (TRPL) of Zinc Tin Oxide (ZTO) nanowires grown by Chemical Vapor Deposition. The PL from the ZTO nanowires does not exhibit any band gap or near gap emission, and the diffuse reflectance measurement confirms that these ZTO nanowires have a direct forbidden transition. The broad PL spectrum reveals two Gaussian peaks centered at 1.86 eV (red) and 2.81 eV (blue), representing two distinct defect states or complexes. The PL spectra were further studied by the Time Resolved Emission Spectrum and intensity dependent PL and TRPL. The time resolved measurements show complex non-exponential decays at all wavelengths, indicative of defect to defect transitions, and the red emissive states decay much slower than the blue emissive states. The effects of annealing in air and vacuum are studied to investigate the origin of the defect states in the nanowires, showing that themore » blue states are related to oxygen vacancies. We propose an energy band model for the nanowires containing defect states within the band gap and the associated transitions between these states that are consistent with our measurements.« less

Authors:
 [1];  [1]; ORCiD logo [1];  [1];  [2];  [3];  [3];  [1]; ORCiD logo [1]
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  1. Univ. of Wyoming, Laramie, WY (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Sun Yat-sen Univ., Guangzhou (China)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1393086
Alternate Identifier(s):
OSTI ID: 1329973
Grant/Contract Number:  
AC02-05CH11231; FG02-10ER46728; SC0004981
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 16; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Yakami, Baichhabi R., Poudyal, Uma, Nandyala, Shashank R., Rimal, Gaurab, Cooper, Jason K., Zhang, Xuejie, Wang, Jing, Wang, Wenyong, and Pikal, Jon M. Steady state and time resolved optical characterization studies of Zn2SnO4 nanowires for solar cell applications. United States: N. p., 2016. Web. doi:10.1063/1.4965697.
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Yakami, Baichhabi R., Poudyal, Uma, Nandyala, Shashank R., Rimal, Gaurab, Cooper, Jason K., Zhang, Xuejie, Wang, Jing, Wang, Wenyong, & Pikal, Jon M. Steady state and time resolved optical characterization studies of Zn2SnO4 nanowires for solar cell applications. United States. https://doi.org/10.1063/1.4965697
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Yakami, Baichhabi R., Poudyal, Uma, Nandyala, Shashank R., Rimal, Gaurab, Cooper, Jason K., Zhang, Xuejie, Wang, Jing, Wang, Wenyong, and Pikal, Jon M. Tue . "Steady state and time resolved optical characterization studies of Zn2SnO4 nanowires for solar cell applications". United States. https://doi.org/10.1063/1.4965697. https://www.osti.gov/servlets/purl/1393086.
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@article{osti_1393086,
title = {Steady state and time resolved optical characterization studies of Zn2SnO4 nanowires for solar cell applications},
author = {Yakami, Baichhabi R. and Poudyal, Uma and Nandyala, Shashank R. and Rimal, Gaurab and Cooper, Jason K. and Zhang, Xuejie and Wang, Jing and Wang, Wenyong and Pikal, Jon M.},
abstractNote = {Nanowires are a promising option for sensitized solar cells, sensors, and display technology. Most of the work thus far has focused on binary oxides for these nanowires, but ternary oxides have advantages in additional control of optical and electronic properties. Here, we report on the diffuse reflectance, Low Temperature and Room Temperature Photoluminescence (PL), PL excitation spectrum, and Time Resolved PL (TRPL) of Zinc Tin Oxide (ZTO) nanowires grown by Chemical Vapor Deposition. The PL from the ZTO nanowires does not exhibit any band gap or near gap emission, and the diffuse reflectance measurement confirms that these ZTO nanowires have a direct forbidden transition. The broad PL spectrum reveals two Gaussian peaks centered at 1.86 eV (red) and 2.81 eV (blue), representing two distinct defect states or complexes. The PL spectra were further studied by the Time Resolved Emission Spectrum and intensity dependent PL and TRPL. The time resolved measurements show complex non-exponential decays at all wavelengths, indicative of defect to defect transitions, and the red emissive states decay much slower than the blue emissive states. The effects of annealing in air and vacuum are studied to investigate the origin of the defect states in the nanowires, showing that the blue states are related to oxygen vacancies. We propose an energy band model for the nanowires containing defect states within the band gap and the associated transitions between these states that are consistent with our measurements.},
doi = {10.1063/1.4965697},
journal = {Journal of Applied Physics},
number = 16,
volume = 120,
place = {United States},
year = {Tue Oct 25 00:00:00 EDT 2016},
month = {Tue Oct 25 00:00:00 EDT 2016}
}
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