Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
Bismuth sulfide (Bi2S3) is a non-toxic metal chalcogenide semiconductor, which lies in the optimal of the solar spectrum with a band gap varying in the range from 1.3 to 1.7 eV, without conclusive evidence of the origin of this deviation [1]. It has a high absorption coefficient and a conversion efficiency from an incident photon to an electron value of ∼5% [2,3]. Under ambient conditions, Bi2S3 has an orthorhombic structure and has a layered (lamellar) structure. This van der Waals material is a potential solar absorber, but its optoelectronic properties are not fully explored and understood.
Here, the optical properties of bulk Bi2S3 have been comprehensively investigated by temperature-dependent optical absorption, photoreflectance (PR) and photoluminescence (PL) measurements in the 20-300 K temperature range and also in the hydrostatic pressure 0 - 20 kbar. The fundamental absorption edge and the photoreflectance transition value has been found to be ∼1.30 eV at room temperature, which is the optimal value, giving a maximum conversion efficiency according to the Shockley–Queisser limit for a single-junction solar cell. The total energy change of the fundamental band gap between 10 K and 300 K is significant of ~0.16 eV, compared to conventional semiconductors. The combination of experimental methods clearly shows that the direct optical transition dominates over the indirect one. Therefore, we reveal Bi2S3 as a nesting-like band gap semiconductor with a strong absorption edge and excitonic emission [4]. A careful analysis of the band structure shows that the experimental results are very consistent with the DFT calculations.
W. M. L. acknowledges support from the Polish National Science Center (Grant No. 2019/35/B/ST5/02819).
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.