Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Publication date: 21st November 2022
Solar cells using methylammonium lead perovskite as light absorbing materials have achieved an astounding 25.5%conversion efficiency improvement, equivalent to silicon solar cells as of 2022. However, there are concerns about the toxic effects of lead in perovskite solar cell materials on human health and the environment, and there is an urgent need to completely replace lead with a more inert metal [1]. In this study, the shift current in lead-free perovskite solar cell materials is estimated by first-principles calculations to evaluate and predict new lead-free perovskite materials. Shift current is a current generated by the real-space movement of electron clouds in materials due to light irradiation [2]. The evaluation and prediction of materials by analyzing their complex photo-response is expected to be applied not only to solar energy conversion but also to photocatalysts, sensors, and other devices.
Typical lead perovskite solar cell materials CsPbBr3, and CsSnBr3 and CsGeBr3, in which lead is replaced by tin and germanium, were discussed. Brillouin zone integrations were performed on an 8 x 8 x 8 grid for structure optimization and on a 20 x 20 x 20 k-point grid for shift currents. First-principles calculations were performed at the GGA/PBE level using norm-conserving pseudopotentials.
The band gaps of CsPbBr3, CsSnBr3, and CsGeBr3 are obtained as 1.79, 0.84, and 1.02 eV for the direct transition type at the R point, and the imaginary part of the dielectric constant rises from those energy values, respectively, and the optical absorption intensity isCsPbBr3<CsSnBr3<CsGeBr3. Interestingly, in the case ofCsSnBr3 and CsGeBr3, the shift current at 1~2 eV is significantly increased compared to CsPbBr3, but the individually integrated shift vectors in that energy region show almost no change for all systems. Therefore, the product of the transition intensity and shift vector, integrated separately for each, does not determine the direction and magnitude of the shift current susceptibility, indicating that the product of each transition and the associated shift vector must be integrated over the band and k points to obtain the shift current. The analysis of the mechanism of shift current onset and its relation to conversion efficiency will be discussed in the poster.
This research was supported by MEXT as “Program for Promoting Researches on the Supercomputer Fugaku” (Realization of innovative light energy conversion materials utilizing the supercomputer Fugaku, JPMXP1020210317).
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.