Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.203
Publication date: 20th April 2022
Charge transporting layers are the pillars of high performing perovskite solar cells, facilitating efficient charge extraction and transport across the device. The right choice of these materials, complementing the energetic alignments of the adjacent perovskite stacks and the electrodes plays a significant role in enhancing the device efficiency. Spiro-OMeTAD is by far one of the most popular and successful charge (hole) transporting materials used in n-i-p perovskite-based devices. However, its several intrinsic drawbacks including its long-term stability, low conductivity, and hole-mobility, in addition to the high cost of synthesis and purification do not deem it to be the most favourable hole transporting material. In the present work we have devised a novel synthetic route to prepare unsymmetric Spiro-OMeTAD derivatives. We report the synthesis of a mono-demethylated Spiro-OMeTAD derivative, SOT-OH, utilizing two different synthetic protocols and show two new derivatives, a dimer (SOT-D) and a trimer (SOT-T) as exemplars. The materials are characterised for their optical, structural and electrical properties, and we show that they are more conductive than the reference Spiro-OMeTAD. Further, we fabricate the perovskite solar cell devices, and observe that these materials deliver comparable performance when used in place of the benchmark sublimed Spiro-OMeTAD.
We thank the EPSRC for funding (GC and AHH EP/P030106/1, PJH EP/P030068/1 and PD EP/T010568/1). We also thank Dr Logan Mackay of the Scottish Instrumentation and Resource Centre for Advanced Mass Spectrometry (University of Edinburgh; Edinburgh, Scotland, UK), for running some of the HRMS.
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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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