Improved diode properties in zinc telluride thin film-silicon nanowire heterojunctions

Date

2015-04-13

Author

AKSOY, FUNDA
AKGÜL, GÜVENÇ
Gullu, Hasan Huseyin
Ünalan, Hüsnü Emrah
Turan, Raşit

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In this study, structural and optoelectronic properties and photodedection characteristics of diodes constructed from p-zinc telluride (ZnTe) thin film/n-silicon (Si) nanowire heterojunctions are reported. Dense arrays of vertically aligned Si nanowires were successfully synthesized on (110)-oriented n-type single crystalline Si wafer using simple and inexpensive metal-assisted etching (MAE) process. Following the nanowire synthesis, p-type ZnTe thin films were deposited onto vertically oriented Si nanowires via radio frequency magnetron sputtering to form three-dimensional heterojunctions. A comparative study of the structural results obtained from X-ray diffraction and Raman spectroscopy measurements showed the improved crystallinity of the ZnTe thin films deposited onto the Si nanowire arrays. The fabricated nanowire-based heterojunction devices exhibited remarkable diode characteristics and enhanced optoelectronic properties and photosensitivity in comparison to the planar reference. The electrical measurements revealed that the diodes with nanowires had a well-defined rectifying behaviour with a rectification ratio of 10(4) at +/- 2V and a relatively small ideality factor of n=1.8 with lower reverse leakage current and series resistance at room temperature in dark condition. Moreover, an open-circuit voltage of 100mV was also observed under illumination. Based on spectral photoresponsivity measurements, the nanowire-based device exhibited a distinct responsivity and high detectivity in visible and near-infrared (NIR) wavelength regions. The device characteristics observed here offer that the fabricated ZnTe thin film/Si nanowire-based p-n heterojunction structures will find important applications in future and will be a promising candidate for high-performance and low-cost optoelectronic device applications, NIR photodedectors in particular.

Subject Keywords

Silicon Nanowires, RF Magnetron Sputtering, Heterojunctions, Optoelectronic Properties

URI

https://hdl.handle.net/11511/48096

Journal

PHILOSOPHICAL MAGAZINE

DOI

https://doi.org/10.1080/14786435.2015.1026296

Collections

Department of Metallurgical and Materials Engineering, Article

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Citation Formats

F. AKSOY, G. AKGÜL, H. H. Gullu, H. E. Ünalan, and R. Turan, “Improved diode properties in zinc telluride thin film-silicon nanowire heterojunctions,” PHILOSOPHICAL MAGAZINE, pp. 1164–1183, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48096.