Abstract
We successfully optimized the charge injection of pentacene-based organic thin-film transistors with bottom contact by immobilizing deoxyribonucleic acid (DNA) on gold electrodes. The single-stranded DNA having mercapto group (-SH) was used as the modified layer by molecular self-assembly onto the surface of gold electrodes. The threshold voltage is −10 V, and the field-effect mobility reaches 0.34 cm2/V s, which is comparable with that of typical top-contact devices. Mechanism of performance improvement is due to the high carrier density in contact region attracted by the phosphate group on the DNA backbone increasing the tunneling probability for improved charge injection. Furthermore, the introduction of modified layer significantly enhanced the grain size of pentacene that is beneficial for charge transport, which also is responsible for the improved device performances.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 61176021), Mechatronics Engineering Innovation Group Project (11ZZ81, 211054), “Shu Guang” project support by Shanghai Municipal Education Commission, and Education Ministry of China. The Science and Technology Commission of Shanghai Municipality (Grant No. 09ZR1411900).
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Gui, H., Wei, B., Zhang, J. et al. Improved charge injection of pentacene transistors by immobilizing DNA on gold source-drain electrodes. Appl. Phys. A 115, 759–763 (2014). https://doi.org/10.1007/s00339-014-8353-z
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DOI: https://doi.org/10.1007/s00339-014-8353-z