Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The efficiency of perovskite-based solar cells has increased rapidly in the last five years and is already comparable with current commercial technologies. Record efficiencies exceeding 20% have already been reported and further improvements are expected. Although the cost of the perovskite material itself is relatively low, state-of-the-art devices incorporate an expensive organic hole-transporting material (HTM), termed Spiro-OMeTAD. Even though this material is fully organic, the expensive starting materials, transition metal catalysts and inert reaction conditions required for the synthesis and extensive product purification make its production cost prohibitive for large area photovoltaics.
Recently, we prepared a low cost azomethine-based (−CH=N−) hole transporting material (EDOT-OMeTPA) using simple and clean Schiff-base condensation chemistry.1 This chemistry offers a very attractive alternative to carbon-carbon coupling reactions since the reaction can be performed at near ambient conditions, no expensive catalysts are required and water is the only by-product, making purification very straightforward if not unnecessary.2 When applied to perovskite solar cells, we have obtained comparable power conversion efficiencies to state-of-the-art Spiro-OMeTAD, however at an estimated cost which is two orders of magnitude lower.
Here we will present a series of novel HTMs, prepared via low cost condensation chemistry, comprising different functional groups. We link the influence of the different groups to the resulting optoelectronic properties of the pristine materials, and when contacted with the perovskite absorber. Our results allow us to postulate new molecular design rules for HTMs to optimize perovskite solar cells. This work paves the way for a new generation of low-cost hole transporting materials.
1 M.L. Petrus, T. Bein, T.J. Dingemans, P. Docampo, J. Mater. Chem. A, 2015, 3, 12159
2 M.L. Petrus, R.K.M. Bouwer, S. Anthanasopoulos, N.C. Greenham, T.J. Dingemans, J. Mater. Chem. A, 2014, 2, 9474
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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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