Tunable Spectrum Selectivity for Multiphoton Absorption with Enhanced Visible Light Trapping in ZnO Nanorods

Kok Hong Tan, Fang Sheng Lim, Alfred Zhen Yang Toh, Xia Xi Zheng, Chang Fu Dee, Burhanuddin Yeop Majlis, Siang Piao Chai, Wei Sea Chang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Observation of visible light trapping in zinc oxide (ZnO) nanorods (NRs) correlated to the optical and photoelectrochemical properties is reported. In this study, ZnO NR diameter and c-axis length respond primarily at two different regions, UV and visible light, respectively. ZnO NR diameter exhibits UV absorption where large ZnO NR diameter area increases light absorption ability leading to high efficient electron-hole pair separation. On the other hand, ZnO NR c-axis length has a dominant effect in visible light resulting from a multiphoton absorption mechanism due to light reflection and trapping behavior in the free space between adjacent ZnO NRs. Furthermore, oxygen vacancies and defects in ZnO NRs are associated with the broad visible emission band of different energy levels also highlighting the possibility of the multiphoton absorption mechanism. It is demonstrated that the minimum average of ZnO NR c-axis length must satisfy the linear regression model of Z p,min = 6.31d to initiate the multiphoton absorption mechanism under visible light. This work indicates the broadening of absorption spectrum from UV to visible light region by incorporating a controllable diameter and c-axis length on vertically aligned ZnO NRs, which is important in optimizing the design and functionality of electronic devices based on light absorption mechanism.

Original languageEnglish
JournalSmall
DOIs
Publication statusAccepted/In press - 1 Jan 2018

Fingerprint

Zinc Oxide
Nanotubes
Zinc oxide
Nanorods
Light
Light absorption
Linear Models
Light reflection
Oxygen vacancies
Ultraviolet Rays
Linear regression
Electron energy levels
Absorption spectra
Observation
Electrons
Oxygen
Equipment and Supplies
Defects

Keywords

  • Light absorption ability
  • Light trapping
  • Multiphoton absorption
  • Photoelectrochemical (PEC)
  • Zinc oxide nanorods

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Engineering (miscellaneous)

Cite this

Tunable Spectrum Selectivity for Multiphoton Absorption with Enhanced Visible Light Trapping in ZnO Nanorods. / Tan, Kok Hong; Lim, Fang Sheng; Toh, Alfred Zhen Yang; Zheng, Xia Xi; Dee, Chang Fu; Yeop Majlis, Burhanuddin; Chai, Siang Piao; Chang, Wei Sea.

In: Small, 01.01.2018.

Research output: Contribution to journalArticle

Tan, Kok Hong ; Lim, Fang Sheng ; Toh, Alfred Zhen Yang ; Zheng, Xia Xi ; Dee, Chang Fu ; Yeop Majlis, Burhanuddin ; Chai, Siang Piao ; Chang, Wei Sea. / Tunable Spectrum Selectivity for Multiphoton Absorption with Enhanced Visible Light Trapping in ZnO Nanorods. In: Small. 2018.
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