Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Perovskite solar cells have attracted much attention as a promising printable photovoltaic device with high power conversion efficiency (PCE). The performance of perovskite solar cells highly depends on the quality of the perovskite layer, and thus the development of the fabrication technology to obtain a dense and flat perovskite layer is one of crucial issues in this field. We have recently optimized our solution method with solvent engineering using a mixed solvent of N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO), which gave a high PCE ~20% even in the cells composed of pure CH3NH3PbI3 perovskite as a photo-absorber. In this method, the higher volatility of DMF relative to DMSO needs a rather narrow process window during spin-coating. For a larger scale device, the development of fabrication method for perovskite layer with a wider process window and high reproducibility is strongly required.
We isolated the complex of CH3NH3PbI3·DMF from a mixture of PbI2 and CH3NH3I in DMF, in which a solvent molecule of DMF is intercalated between the perovskite components. This complex shows higher solubility in DMSO (within 10 min at room temperature) than that of PbI2 and CH3NH3I mixture (1:1) in DMSO (60 min), suggesting its utility as a highly purified precursor for perovskite layer in the solution method using DMSO with a wider process window.
Whereas, the lower saturated concentration of PbI2 and CH3NH3I mixture (1:1) in DMSO (1.2 M) limits the concentration of the precursor solution to 1.1 M, the higher saturated concentration of CH3NH3PbI3·DMF (2.0 M) allows us to use the higher concentration of 1.4 M in DMSO for spin-coating. Using a 1.1 M DMSO solution of PbI2 and CH3NH3I mixture resulted in the formation of thin perovskite with the thickness of ca. 180 nm, which gave the moderate JSC and PCE (JSC = 21.8 mA/cm2, VOC = 1.15 V, FF = 0.70, PCE = 17.6%). In contrast, the use of 1.4 M DMSO solution of the complex successfully provided a dense and thicker perovskite layer with the thickness of ca. 350 nm, which improved JSC and PCE (JSC = 22.7 mA/cm2, VOC = 1.15 V, FF = 0.76, PCE = 19.8%). Furthermore, this method is an easily applicable to large-area module. We further demonstrate large-area perovskite solar module of 22 cm2 with 14.2% stabilized active-area efficiency output.
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.