Mobility in amorphous organic hole transport materials Miriam Fsadni 1 , Thomas Pope 1 , Thomas Penfold 1 and Pablo Docampo 2 1 Chemistry, School of Natural and Environmental Sciences, Newcastle University, UK, 2 School of Chemistry, University of Glasgow, UK Perovskite solar cells (PSC) are widening the scope of photovoltaics (PVs) to applications beyond the effective capabilities of conventional silicon-based PVs. They are able to operate efficiently under low light conditions and can easily be printed as cheap lightweight-flexible devices, making them suitable for integration within indoor and portable systems. 1 The organic hole transporter material (HTM) used plays a major role in controlling the overall performance and cost of PSCs. One challenge is charge recombination, due to charge build- up at the HTM/perovskite interface, which limits the efficiency of the solar cell. 2 In addition, state-of- the-art HTMs, such as Spiro-OMeTAD, are expensive and difficult to synthesise thereby reducing commercially viability. 3 As a result, inexpensive aromatic amide, azomenthine and hydrazone-based HTMs have been developed employing simple Schiff-base condensation chemistry, the structures of which can be tuned to optimise performance. 1,3,4 By combining theoretical and experimental approaches, we are looking to understand the improved charge transport properties of novel materials with disrupted conjugation in the backbone, built using condensation chemistry. Based on our results, we aim to design and synthesise improved materials for use within PSCs. Here we present our recent findings from theoretical studies on the relationship between the HTM electronic dipole moment and charge carrier mobility. References 1. M. L. Petrus et al., Adv. Energy Mater ., 2018, 8 , 1801605. 2. P. Agarwala and D. Kabra, J. Mater. Chem. A , 2017, 5 , 1348–1373.
3. M. L. Petrus et al., J. Mater. Chem. A , 2017, 5 , 25200. 4. M. L. Petrus et al., Mol. Syst. Des. Eng. , 2018, 3 , 734-740.
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