Impact of Nonfullerene Acceptor Side Chain Variation on Transistor Mobility

Abstract
Organic photovoltaic power conversion efficiencies exceeding 14% can largely be attributed to the development of nonfullerene acceptors (NFAs). Many of these molecules are structural derivatives of IDTBR and ITIC, two common NFAs. By modifying the chemical structure of the acceptor, the optical absorption, energy levels, and bulk heterojunction morphology can be tuned. However, the effect of structural modifications on NFA charge transport properties has not yet been fully explored. In this work, the relationship between chemical structure, molecular packing, and charge transport, as measured in organic thin-film transistors (OTFTs), is investigated for two high performance NFAs, namely O-IDTBR and ITIC, along with their structural derivatives EH-IDTBR and ITIC-Th. O-IDTBR exhibits a higher n-type saturation field effect mobility of 0.12 cm2 V−1 s−1 compared with the other acceptors investigated. This can be attributed to the linear side chains of O-IDTBR which direct an interdigitated columnar packing motif. The study provides insight into the transport properties and molecular packing of NFAs, thereby contributing to understanding the relationship between chemical structure, material properties, and device performance for these materials. The high electron mobility achieved by O-IDTBR also suggests its applications can be extended to use as an n-type semiconductor in OTFTs.

Citation
Bristow, H., Thorley, K. J., White, A. J. P., Wadsworth, A., Babics, M., Hamid, Z., … McCulloch, I. (2019). Impact of Nonfullerene Acceptor Side Chain Variation on Transistor Mobility. Advanced Electronic Materials, 5(10), 1900344. doi:10.1002/aelm.201900344

Acknowledgements
The authors thank KAUST and Eight19 for financial support. They also acknowledge EC FP7 Project SC2 (610115), EC H2020 (643791), EPSRC Projects EP/G037515/1, EP/M005143/1, EP/L016702/1 as well as NSF DMREF program DMREF-1627428.

Publisher
Wiley

Journal
Advanced Electronic Materials

DOI
10.1002/aelm.201900344

Additional Links
https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201900344

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