Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
It is very exciting that the photovoltaic efficiency of organic solar cells (OSCs) is rapidly rising in the past years, thanks to the overwhelming efforts of the scientific community. To date, above 18 % efficiencies are already achievable through different interesting approaches, thereby surpassing the previously proposed 15 % benchmark for rational commercialization. However, these advancements typically come with increasing complexities for scalability which will inflate the manufacturing costs in large-scale productions. Likewise, the poor performance stability also continues to undermine their marketplace potential. Herein, we studied three state-of-the-art non-fullerene acceptors with variable outer side groups and a synthetically reproducible random terpolymer donor PM1, constructing simple binary-component bulk heterojunctions. We found that the disorder between the donor and acceptor interface facilitates the polaron recombination. Specifically, it is observed to increase the bimolecular recombination resistance by imposing an uphill transport energy landscape from the bulk to the interface. Hence, the increasing energy barrier for the interfacial encounter of oppositely charged polarons originating from acceptor domains and donor networks promotes more efficient charge transport. Meanwhile, nanomorphology and electrostatics are shown to have critical roles in diminishing possible trade-offs. In consequence, devices with above 80 % fill factors and 18 % efficiencies are demonstrated to remain obtainable without compromising scalability. Additionally, the donor-acceptor interface is uncovered to substantially influence the burn-in losses such that understanding the stability of individual blend components is not sufficient to define the device’s long-term operational performance. By taking advantage of the synthetic flexibility of organic molecules defining the interface and bulk properties and the direct physical meanings of the introduced principle, the true optimum potential of simpler devices will begin to be realized. Thereafter, developments necessary to ultimately reach marketplace standards will be appropriately directed toward more cost-effective and practical strategies.
We thank the Guangdong government and the Guangzhou government for funding (2021QN02C110). M. Li acknowledges the financial support from the Shenzhen Science, Technology and Innovation Commission (R2021A064) and Research Grant Council of Hong Kong (PP7Z). G. Li acknowledges the support from Research Grants Council of Hong Kong (Project Nos 15320216, 15221320, C5037-18G), RGC Senior Research Fellowship Scheme (SRFS2122-5S04), National Natural Science Foundation of China (51961165102), Shenzhen Science and Technology Innovation Commission (JCYJ20200109105003940, SGDX2019081623220944), the Hong Kong Polytechnic University Internal Research Funds: Sir Sze-yuen Chung Endowed Professorship Fund (8-8480), RISE (1-CDA5), 1-W15V, and Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices (GDSTC No. 2019B121205001). R. Ma thanks the support by PolyU Distinguished Postdoc Fellowship. This work is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under award no. DE-FG02-99ER14999 (M.R.W.).
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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.
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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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