Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.140
Publication date: 27th October 2017
Organic solar cells and organohalide perovskite solar cells share several common electro-optical operating principles [1]. Both families of devices operate within the thin film, low finesse cavity limit and there are also commonalities in electrodes and ancillary layer materials and structures [2]. It is therefore not surprising that organic and organohalide perovskite solar cells are subject to the same scaling physics considerations, i.e. the physical mechanisms that come into play in retaining performance and efficiency in large area devices, particularly those deposited by printing or other solution processing methods. A simple example of such physics is the limitation in the size of ‘maximum carrier collection path length’ which is dominated by the sheet resistance of the transparent conducting electrode and shown to be ~ 1-2 cm for commonly used 15 ohm/sq indium tin oxide [3]. This phenomenon has meant that the majority of large area organic solar cells are invariably serially interconnected thin strips.
In my talk I will review these scaling physics considerations and explain their basic origin in terms of electro-optics and transport phenomena in both organic and organohalide perovskite solar cells. I will explore how the limitations of scaling physics can potentially be overcome and demonstrate so-called large area ‘monolithic architectures’ which retain their fill factor and hence power conversion efficiency up to 5 cm x 5 cm. Addressing the scaling physics in next generation thin film solar cells is an essential part of endeavors to create viable modules and hence progress low cost manufacturing and ultimately commercialization of printed solar cells [4].
[1] Lin et al. Nature Photonics, 9, 106-112 (2015);
[2] Armin et al. ACS Photonics, 1(3), 173-181 (2014);
[3] Jin et al. Advanced Energy Materials, 2(11), 1338-1342 (2012).
Armin & Meredith, “The Scaling Physics of Thin Film Organic Solar Cells”, in World Scientific Handbook of Organic Optoelectronics, Volume 2 Organic Photovoltaics, Chapter 7 (edited F. So & B. Thompson), World Scientific Publishing, New York (2017).
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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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