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Ag2S/CdS/TiO2 Nanotube Array Films with High Photocurrent Density by Spotting Sample Method.

Hong Sun1, Peini Zhao1, Fanjun Zhang1

  • 1Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, People's Republic of China.

Nanoscale Research Letters
|October 3, 2015
PubMed
Summary

This study developed Ag2S/CdS/TiO2 hybrid nanotube films using a novel Spotting Sample Method (SSM). The SSM-enhanced films show significantly improved sunlight absorption and photocurrent density for solar energy applications.

Keywords:
Nanotube array filmsPhotocurrent densityQuantum dotsSpotting sample method

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photovoltaics

Background:

  • Titanium dioxide (TiO2) nanotube array films (TNTs) are promising for solar energy due to their properties.
  • Enhancing light absorption and charge separation in TNTs is crucial for improving their efficiency.
  • Semiconductor quantum dots (QDs) offer tunable optical properties for solar energy applications.

Purpose of the Study:

  • To prepare Ag2S/CdS/TiO2 hybrid nanotube array films (Ag2S/CdS/TNTs) using a selective deposition technique.
  • To investigate the effect of the Spotting Sample Method (SSM) on the photoelectric properties of Ag2S/CdS/TNTs.
  • To compare the performance of SSM-fabricated films with those prepared using the Successive Ionic Layer Adsorption and Reaction (SILAR) method.

Main Methods:

  • Anodic oxidation was used to fabricate the initial TiO2 nanotube array films (TNTs).
  • Ag2S and CdS semiconductor quantum dots (QDs) were selectively deposited onto TNTs using the Spotting Sample Method (SSM).
  • Characterization techniques included X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS).

Main Results:

  • The successful preparation of Ag2S/CdS/TNTs using SSM was confirmed by various characterization methods.
  • Ag2S/CdS/TNTs fabricated by SSM exhibited superior sunlight absorption in the UV-vis range (320–800 nm) compared to SILAR-prepared films.
  • The photocurrent density of Ag2S/CdS/TNTs prepared by SSM (with 6 deposition cycles) was approximately 37 times higher than that of unmodified TNTs.

Conclusions:

  • The Spotting Sample Method (SSM) enables selective deposition of semiconductor QDs, significantly enhancing the performance of TiO2 nanotube array films.
  • Ag2S/CdS/TNTs prepared by SSM demonstrate greatly improved light absorption and photocurrent density, highlighting their potential for efficient solar energy utilization.
  • Optimizing deposition cycles is critical for maximizing the photoelectric properties of these hybrid nanotube films.