Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.110
Publication date: 18th July 2019
Phase separation of the semiconductors in donor-acceptor-type bulk heterojunction (BHJ) organic solar cells is one of the most important factors controlling device performance metrics. Thermodynamically, the phase separation in BHJ systems can never result in perfectly pure domains. In this work, low-donor-content fullerene-based solar cells are used as a model system to investigate the impact of domain purity in BHJ solar cells more broadly. At donor concentrations of ≥5%, charge collection follows the standard BHJ behavior in that the open-circuit voltage is governed by the relative energetics of donor-acceptor components. At concentrations below 1%, the donor molecules increasingly behave as trap sites where no donor-to-donor hope hopping can occur. In this limit, the transport of photogenerated holes is dominated by optical release (i.e. photo-induced), with the charge collection efficiency and open-circuit voltage becoming independent of the energetics of the donor. A comprehensive device model for understanding the long-debated operation of donor-acceptor solar cells in the ultralow-donor-content limit is developed. This model provides intriguing insights into the more general behavior of true, high efficiency BHJs and in particular the limitations set by domain purity.
This work was supported by the Sêr Cymru Program through the European Regional Development Fund, Welsh European Funding Office and Swansea University strategic initiative in Sustainable Advanced Materials. A.A. is a Sêr Cymru II Rising Star Fellow and P.M. a Sêr Cymru II National Research Chair.
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.