Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Intermediate band semiconductors have raised interest as materials to enhance photovoltaics’ efficiency and promote photocatalytic activity driven visible light. In this work we present a study on the doping of In2S3 with Vanadium[1] synthesized by Ion Layer Gas Reaction (ILGAR) technique[2] using 4 different V concentrations. The resulting materials have been characterized by X-Ray diffraction, UV-Vis absorption spectroscopy, scanning electron microscopy and X-Ray photoemission spectroscopy. These techniques yielded no significant differences between the non-doped and V-doped β-In2S3 thin films. Therefore, we performed Time Resolved Microwave Conductivity (TRMC) measurements that showed a decrease of carrier lifetime and diffusion length; these results suggest the presence of an intermediate band that increases the recombination and trapping of the charge carriers in V-doped β-In2S3 layers. A different mechanism for charge separation has been observed by Surface Photovoltage Spectroscopy (SPV) for V-doped β-In2S3 layers, indicating the presence of an intermediate band. Photocurrent and photoluminescence have shown that the presence of V enhance both parameters compared to non-doped In2S3; capacitance-voltage measurements show a shift on the flat band potential for the V-doped samples that may be consequence of a change in the energy values of both the valence and conduction bands. The results of Incident Photon to Current Conversion Efficiency (IPCE) measurements suggest the formation of an intermediate band that creates a photon-to-photon effect.
[1] V-substituted In2S3: an intermediate band material with photocatalytic activity in the whole visible light range. R. Lucena, J. C. Conesa, I. Aguilera, P. Palacios and P. Wahnón.J. Mater. Chem. A, 2014, 2, 8236. DOI: 10.1039/C4TA00513A.
[2] A novel deposition technique for compound semiconductors on highly porous substrates: ILGAR. J. Möller, Ch.-H. Fischer, , H.-J. Muffler, R. Könenkamp, I. Kaiser, C. Kelch, M.C. Lux-Steiner. Thin Solid Films, 2000, 361, 113. DOI: 10.1016/S0040-6090(99)00797-X.5362.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.