Regensburg 2022 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 16: Thin Film Applications 2

DS 16.3: Vortrag

Mittwoch, 7. September 2022, 11:30–11:45, H14

Physical unclonable function based on unsorted carbon nanotube random networks in multi-contact field-effect transistors — Jonas Schroeder¹, •James W. Borchert¹, Patrick Schuster², Peter Eder², Stefan Heiserer³, Josef Biba³, Georg S. Duesberg³, Ulrich Rührmair^2,4, and R. Thomas Weitz¹ — ¹Georg-August Universität Göttingen, Göttingen, Germany — ²Ludwig-Maximilians-Universität München, München, Germany — ³Universität der Bundeswehr München, Neubiberg, Germany — ⁴University of Connecticut, Storrs CT 06269, USA

The standard practice in cryptography of using digital binary keys that are permanently stored on devices is prohibitively inefficient for some applications and open to both physical and software-based attacks. A promising alternative approach known as 'physical unclonable function' (PUF) instead uses the inherent random variation in fabrication to create physical 'keys' that produce unique randomized responses to defined challenges. Electrical PUF devices based on random networks of unsorted carbon nanotubes (CNTs) have shown promise, but so far have been limited in terms of scaling up the number of challenge-response pairs (CRPs) that can be extracted. Here, we demonstrate how gating the CNT networks might be a useful method for expanding the number of CRPs, thus strengthening the scalability of the PUF. We show CNT networks implemented in modified field-effect transistors with up to 12 contacts. The output randomness and stability of the devices are investigated, and further routes for improvement are discussed.