Abstract
The peculiarities of optical and electrical properties of organic(clonidine)/inorganic(Si) heterojunction with plasmonic Au nanoparticles have been investigated by reflection spectra, photoelectric and current-voltage characteristics measurements. Porous nanostructured surfaces of silicon wafers were obtained by the method of selective chemical etching initiated by metal (gold) nanoparticles. Nanocomposites based on nanostructured silicon, clonidine and gold nanoparticles have been made. Two types of structure, namely, solar cells and photodiodes on the basis of such heterojunction were analysed. The reflection spectra of light confirmed the excitation of the plasmon mode in nanocomposites with gold nanoparticles. Photoelectric studies have shown an increase of the photocurrent of solar cells obtained as a result of using both nanostructured silicon and gold nanoparticles in 1.5 and 7 times, respectively. Study of the injection properties of the structures showed that the clonidine layer always facilitates the injection of current carriers, while gold nanoparticles limit the current in the case of a flat surface.
Highlights
Nanocomposite materials for photovoltaic purposes have been used for a long time [1,2,3,4,5,6]
The low efficiency of such elements, due to the high bandwidth in TiO2, which can absorb only the blue and UV part of the solar spectrum, is enhanced by the introduction of an additional component in the composite dye sensitizers [7, 8] with a wide range of absorption of the visible and near-infrared spectrum, sufficiently resistant to oxidation and with suitable energy parameters of the HOMO/LUMO position, so that the LUMO level is higher (>0.3 eV) than the level of the conduction band TiO2 and the electrons generated in the sensitizer could pass without barrier to the acceptor (Fig. 1)
The optical spectra reveal the excitation of surface plasmon modes in gold nanoparticles introduced into composite porous layer
Summary
Nanocomposite materials for photovoltaic purposes have been used for a long time [1,2,3,4,5,6]. The low efficiency of such elements, due to the high bandwidth in TiO2, which can absorb only the blue and UV part of the solar spectrum, is enhanced by the introduction of an additional component in the composite dye sensitizers [7, 8] with a wide range of absorption of the visible and near-infrared spectrum, sufficiently resistant to oxidation and with suitable energy parameters of the HOMO/LUMO (highest filled molecular orbital/lowest molecular orbital) position, so that the LUMO level is higher (>0.3 eV) than the level of the conduction band TiO2 (acceptor) and the electrons generated in the sensitizer (donor) could pass without barrier to the acceptor (Fig. 1). The semiconductors that have the best charge transport characteristics are Si, InP, and GaAs, where the electron
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