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Updated: Feb 10, 2026
11:06
Fabrication of Fully Solution Processed Inorganic Nanocrystal Photovoltaic Devices
Published on: July 8, 2016
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Three-dimensional hot electron photovoltaic device with vertically aligned TiO2 nanotubes
Kalyan C Goddeti1,2, Changhwan Lee1,2, Young Keun Lee1,2
1Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon, 305-701, Korea.
Scientific Reports
|May 11, 2018
Summary
Researchers created plasmonic nanodiodes using titanium dioxide (TiO2) nanotubes and gold or silver. The silver-based nanodiode demonstrated enhanced solar energy conversion by efficiently capturing hot electrons generated from light absorption.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Titanium dioxide (TiO2) nanotubes offer advantages as electron transport materials in solar cells due to their large surface area and linear charge transport.
- Integrating one-dimensional TiO2 nanotubes with plasmonic metals can create three-dimensional nanodiodes for enhanced solar energy conversion via hot electron utilization.
Purpose of the Study:
- To devise plasmonic nanodiode architectures using Au/TiO2 and Ag/TiO2 nanotube arrays.
- To enhance photon absorption and the generation/capture of hot carriers for improved solar energy conversion.
Main Methods:
- Fabrication of plasmonic Au/TiO2 and Ag/TiO2 nanodiode architectures.
- Measurement of photocurrents and incident photon to current conversion efficiencies (IPCE) as a function of photon energy.
- Finite-difference time-domain (FDTD) simulations to calculate electric fields and absorbances.
Main Results:
- The Ag/TiO2 nanodiode exhibited enhanced photocurrents and IPCE compared to other configurations.
- Strong plasmonic peaks in IPCE spectra indicated enhanced hot electron flux due to surface plasmons.
- FDTD simulations corroborated experimental findings regarding electric fields and absorbance.
Conclusions:
- Combining hot electron photovoltaic devices with 3D architectures maximizes light absorption and metal-semiconductor interface area.
- Plasmonic nanodiodes based on TiO2 nanotube arrays represent a promising strategy for advanced solar energy conversion.
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