Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Publication date: 21st November 2022
Domain size, phase purity and the mixed network of the bulk heterojunction of organic solar cell active layers of organic solar cells (OSCs) are essential for efficient charge generation and transportation [1]. However, it is challenging to characterize the bulk heterojunction morphology because of the small dimensions and low contrast for many probes of nanoscale structure. One of the most successful methods is Resonant Soft X-ray Scattering (RSoXS) which can only be done at some synchrotron facilities. RSoXS is a small-angle scattering technique leveraging soft X-ray transition dipoles, allowing quantitative characterization of nanoscale molecular orientations [2]. Like RSoXS, GHz spectroscopy uses the molecular orientation dipole moment relaxation, and most organic materials possess a dipole relaxation in the frequency range of 1-110 GHz. In our analysis, we correlated the dielectric relaxation strength of the NFA-polymer blend to the domain length, and through this, we can distinguish mixed and pure domains. A slight limitation is that this method only applies to materials with a known molecular structure and dipole moment.
This presentation first examines the complex permittivity (ϵ*) of the PM6:Y7 blend from 1-70 GHz. In this range, ϵ* is determined by a reflection/transmission measurement on coplanar waveguides using a Vector Network Analyzer. ϵ* is extracted by combining the conformal mapping method and a transmission line distributed element model [3]. We observed two dielectric relaxations at 4.8 (R1) and 35.8 GHz (R2), and the data were fitted with the Havriliak–Negami (HN) function. Relaxation at 4.8 GHz shows Cole-Davidson behaviour (induced relaxation) corresponding to PM6 polymer, while 35.8 GHz is Debye relaxation corresponding to the Y7 NFA molecule [4-5]. Secondly, under biased voltage ϵ* shows butterfly-shaped permittivity hysteresis loops. This allows us to use the double potential well model to fit relaxation strength to extract the domain length [6], which is 90-110 nm.
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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.
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