World's Tiniest QR Code Shatters Records—Just 1.98 Micrometers Squared

Scientists at the Technical University of Vienna have broken the world record for the smallest QR code generator. Etched into a ceramic thin film, the code measures just 1.98 square micrometers—far smaller than any previous version. Its tiny size and high durability could revolutionise data storage technology.

The QR code consists of 29 by 29 modules, with each pixel spanning only 49 nanometers. An electron microscope is required to read it, as even a light microscope cannot resolve such fine details. This achievement sets a new Guinness World Record, surpassing the previous smallest QR code by a wide margin.

The ceramic thin films used in this process are exceptionally stable, even under extreme conditions. This makes them ideal for long-term data storage. Researchers tested 12 different materials, including phase-change compounds like GeSbTe, ferroelectric substances such as HfO₂ and PZT, and resistive switching materials like TaOₓ and TiO₂.

The team, led by scientists including Jürgen Faist and Paul Müller, published their findings in journals like Advanced Materials and ACS Nano. Their work also explores how complex data structures can be written and reliably read from these films. A single A4-sized sheet, using this method, could theoretically store over two terabytes of data.

Looking ahead, the researchers aim to test alternative materials, improve writing speeds, and develop scalable production techniques. Their goal is to make ceramic-based data storage practical for real-world applications.

The record-breaking QR code achieves an information density of 130 bits per square micrometer. This breakthrough demonstrates the potential of ceramic thin films for ultra-compact, long-lasting data storage. Further advancements could lead to commercial uses in the near future.