Molecules could become the ultimate building blocks for future electronics, but their extraordinary small size has also made them notoriously difficult to integrate into practical devices. Now, researchers at MIT have developed a fabrication platform that brings fragile molecular materials into working electronic circuits without exposing them to the damaging conditions normally used in semiconductor manufacturing. In a demonstration reported in Nature Nanotechnology, the team built more than 1,000 molecular devices, including interconnected memory elements, using molecular layers less than one nanometer thick.
The advance could help transform molecules from laboratory curiosities into components for next-generation computing, sensing, photonics, and quantum technologies. Unlike conventional semiconductor materials, molecules can be designed with precisely tailored structures and chemical properties. Their behavior can be adjusted at the atomic level, potentially allowing engineers to create devices that are smaller, faster, more energy-efficient, and capable of functions that conventional silicon-based components cannot easily perform.
The central challenge is making reliable electrical connections to these molecular materials. Traditional semiconductor fabrication relies on harsh chemicals, high temperatures, plasma treatments, and other processes that can destroy or alter delicate molecular structures. Even when the molecules survive, placing metallic contacts on them with nanometer-scale precision is difficult. A damaged or poorly aligned contact can overwhelm the electrical behavior researchers are trying to measure, making the device unreliable or impossible to use in a larger circuit.
The MIT team addressed the problem by separating device fabrication into two stages. First, they used conventional semiconductor manufacturing techniques to create the main device structure, including metal electrodes and supporting components. Only after those elements were complete did they introduce the molecular material. This “decoupled” strategy allows the researchers to use scalable manufacturing methods while protecting the molecules from processes that would otherwise be incompatible with them.
In their demonstration, the researchers fabricated a scaffold containing two metal electrodes separated by a carefully engineered gap. They then deposited a molecular layer onto the electrode surfaces. The final electrical contact was not produced by aggressively pressing or patterning metal onto the molecules. Instead, the team designed the electrodes so that nanoscale physical forces could gently bring them together, allowing the molecular layer to become sandwiched between the two conducting surfaces.
The process relies first on capillary forces, the same type of force that allows water to move through the narrow channels of a plant. As the liquid solution containing the molecules evaporates, surface tension pulls the closely spaced electrodes toward one another. The electrodes are mechanically designed with the right stiffness, enabling them to move in a controlled way rather than collapse unpredictably or crush the molecular material.
After the electrodes make contact with the molecular layer, van der Waals forces help stabilize the structure. These weak attractions arise between neighboring surfaces and become highly significant at the nanoscale. By adjusting the contact area, electrode geometry, and molecular properties, the researchers created a structure in which the electrodes remain securely positioned without damaging the layer between them. The result is a self-aligned electrical contact formed through mechanical self-assembly rather than conventional nanoscale patterning.
This approach allowed the team to fabricate over 1,000 devices using molecular films thinner than one nanometer. Approximately 96 percent of the devices functioned, a high yield for experimental molecular electronics. The devices also withstood tens of thousands of electrical cycles without visible degradation, addressing one of the field’s most persistent problems: molecular components often display promising behavior in isolated experiments but fail to maintain stable performance over repeated operation.
The researchers demonstrated that their platform can move beyond individual test devices by constructing an interconnected array of molecular memory elements. Circuit-level integration is a crucial step toward practical molecular electronics because useful computing and sensing systems require large numbers of components to communicate reliably. The same fabrication concept may also be adapted to other atomic-scale materials, molecular architectures, and multifunctional devices. By combining the reach of conventional semiconductor manufacturing with the precision of self-assembly, the platform could open a pathway to electronics and computing systems built around materials that were previously too fragile or difficult to integrate at scale.
Subject of Research: Molecular electronics and scalable nanofabrication
Article Title: “Self-assembled contacts for high-yield molecular devices”
Web References: https://doi.org/10.1038/s41565-026-02227-9
References: Nature Nanotechnology, “Self-assembled contacts for high-yield molecular devices,” DOI: 10.1038/s41565-026-02227-9
Image Credits: Courtesy of Farnaz Niroui
Keywords: Molecular electronics, nanotechnology, nanofabrication, molecular devices, electronic devices, molecular memory, semiconductor manufacturing, self-assembly, capillary forces, van der Waals forces, quantum technologies, MIT, Nature Nanotechnology
