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

Yakami, Baichhabi R.; Poudyal, Uma; Nandyala, Shashank R.; Rimal, Gaurab; Cooper, Jason K.; Zhang, Xuejie; Wang, Jing; Wang, Wenyong; Pikal, Jon M.

doi:10.1063/1.4965697

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

Journal Article · Tue Oct 25 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4965697· OSTI ID:1393086

Yakami, Baichhabi R. ^[1]; Poudyal, Uma ^[1];

^[1]; Rimal, Gaurab ^[1]; Cooper, Jason K. ^[2]; Zhang, Xuejie ^[3]; Wang, Jing ^[3]; Wang, Wenyong ^[1];

^[1]

Univ. of Wyoming, Laramie, WY (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sun Yat-sen Univ., Guangzhou (China)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; FG02-10ER46728; SC0004981

OSTI ID:: 1393086

Alternate ID(s):: OSTI ID: 1329973

Journal Information:: Journal of Applied Physics, Vol. 120, Issue 16; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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