UCLA researchers eliminate nanoscale bottleneck to unlock next generation perovskite electronics

UCLA researchers use quantum tunneling to shrink electrical barriers in perovskites, enabling faster and more efficient next-gen electronic devices.

By: AXL Media

Published: Mar 21, 2026, 5:47 AM EDT

Source: Information for this report was sourced from California NanoSystems Institute

The Challenge of the Clogged Doorway

Perovskite semiconductors have long been hailed as the future of solar cells and advanced sensors due to their low manufacturing costs and high efficiency. However, a significant "nanoscale bottleneck" has prevented their transition from the laboratory to mass-market electronics. The primary obstacle is the interface where the metal electrode meets the semiconductor, which often behaves like a clogged doorway, wasting energy and slowing down the flow of electrical current. UCLA researchers have now found a way to clear this passage, significantly improving how electricity enters the material.

Bypassing the Limitations of Traditional Doping

In conventional semiconductors, engineers typically improve conductivity through "impurity doping," a process that introduces additional charge carriers. This strategy is difficult to apply to perovskites because the materials are chemically sensitive and relatively soft, making traditional doping methods destructive. To bypass this, the UCLA team developed a "contact-induced charge-transfer" method. Instead of modifying the entire semiconductor, they focused exclusively on engineering the tiny region directly beneath the metal electrode to minimize damage and maximize efficiency.

The Mechanics of Quantum Tunneling

The researchers utilized a three-step process to create a localized p-doped region. First, a metal electrode was placed on the perovskite using van der Waals lamination to prevent surface damage. Next, mild thermal annealing allowed silver to diffuse into the surface, which was then converted into silver oxide nanoclusters using ultraviolet light. These nanoclusters act as electron acceptors, narrowing the energy barrier at the interface. This allows electrons to pass through the barrier via Fowler–Nordheim quantum tunneling—a quantum mechanical process—rather than relying on traditional, slower thermal emission.