Physically Unclonable Functions Using Fluorescent Organic Semiconductors

Kayacı N., Özdemir R., Kalay M., Kiremitler N. B., Usta H., Önses M. S.

16th NANOSCIENCE & NANOTECHNOLOGY CONFERENCE, Ankara, Turkey, 5 - 08 September 2022, pp.376

  • Publication Type: Conference Paper / Summary Text
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.376
  • Kayseri University Affiliated: Yes


Anti-counterfeiting and data security applications require design and development of novel materials and methods for encoding information. [1] Physically unclonable functions (PUFs) has been introduced as a new approach in fabrication of encoded surfaces . PUFs are composed of complex structures embodied by stochastic mechanisms. The inherently random responses of PUFs makes the replication of encoded surfaces impossible by third parties or even by the manufacturer itself [2,3]. Fluorescent compounds attract great attention, because of the simple and fast authentication [4]. In this study, we will present fabrication of organic light-emitting physically unclonable functions (OLE-PUFs) using fluorescent organic semiconductors (f-OSCs). The formation of random domains via surface dewetting of thin films of f-OSCs is the basis of our approach. The OLE-PUF fabrication process consists of deposition of f-OSC and thermal annealing as short as 5 minutes at a modest temperature (120 to 170 C). Depending on annealing temperature and film thickness, bright and hemispherical random features with different properties are formed on the surface by various transport mechanisms. Thanks to unique photoluminescence and chemical properties of the f-OSC molecule and the random positions of these hemispherical features, multi-layered security measures are established. Multiple-security layer can be incorporated to OLE-PUFs using unique fluorescence profile, excited-state decay dynamics, and Raman spectrum. The OLE-PUFs can be formed on substrates of different chemistry, surface wetting property and rigidity. The drop-casting enables direct deposition on goods with minimal material consumption. OLE-PUFs are highly stable against external effects such as water, sand, UV-light and temperature [5].