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Abstract
A ‘sandwich'-structured TiO2NR/HGN/CdS photoanode was successfully fabricated by the electrophoretic deposition of hollow gold nanospheres (HGNs) on the surface of TiO2 nanorods (NRs). The HGNs presented a wide surface plasmon resonance character in the visible region from 540 to 630 nm, and further acted as the scatter elements and light energy ‘antennas' to trap the local-field light near the TiO2NR/CdS layer, resulting in the increase of the light harvesting. An outstanding enhancement in the photochemical behaviour of TiO2NR/HGN/CdS photoanodes was attained by the contribution of HGNs in increasing the light absorption and the number of electron-hole pairs of photosensitive semiconductors. The optimized photochemical performance of TiO2NR/HGN/CdS photoanodes by using plasmonic HGNs demonstrated their potential application in energy conversion devices.
Highlights
Quantum dot-sensitized solar cells (QDSSCs) have attracted increasing interest and are considered as a potential alternative to silicon-based photovoltaic devices [1,2,3]
We introduce the hollow gold nanospheres (HGNs) into the TiO2NR structure by a facile electrophoretic technology
From the cross-sectional and surface SEM images of TiO2NR/HGN/CdS sample, we can see that many CdS quantum dot (QD) are well adsorbed onto the side walls of TiO2NR/HGN via successive ionic layer adsorption and reaction (SILAR)
Summary
Quantum dot-sensitized solar cells (QDSSCs) have attracted increasing interest and are considered as a potential alternative to silicon-based photovoltaic devices [1,2,3]. Narrow-bandgap QDs have high absorption cross section and absorb light in the visible to infrared (IR) range, which can be combined with wide-bandgap TiO2 semiconductors to form a heterostructure and allow excellent charge transport [14,15,16,17,18,19,20,21,22]
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