Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.202
Publication date: 21st February 2018
Back-contact concepts are well established in the field of silicon solar cells, where their implementation has resulted in significant efficiency gains, compared to conventional contacting architectures. Charge collection in these devices is typically facilitated by a set of two interdigitated finger electrode arrays, co-located on the backside of the silicon wafer. Here we describe the fabrication and study of back-contact perovskite solar cells (bc-PSCs) with novel contact geometries. The main advantage of back-contact concepts is that optical transmission losses can be avoided, arising from the top charge collection electrode, which for PSCs typically is a thin conducting oxide (TCO) layer. The back-contact design furthermore provides the opportunity to study the influence of post-processing treatments on device efficiency in situ. To demonstrate this we study the evolution of bc-PSCs performance during their exposure to pyridine vapors. Furthermore we report a novel photovoltaic device concept based on a gold-perovskite-gold Schottky-junction bc-PSCs in which the work-function of the gold electrodes is controlled by the presence of self-assembled molecular monolayers (SAM). We provide evidence of the successful workfunction tuning by means of Kelvin probe microscopy while also presenting the photovoltaic performance date of these devices. We show that the presence of these SAMs can produce photovoltages of up to 600 mV and photocurrents in excess of 12 mA/cm2 under simulated sunlight, despite a large center-to-center electrode spacing of 6.5 µm.
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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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