Skip to Content
Find More Like This
Return to Search

Molecular Adhesion and Patterned Absorber Layers for Switchable Photovoltaics

National Renewable Energy Laboratory

Contact NREL About This Technology

Technology Marketing Summary

Perovskite photovoltaics are a new class of light absorbers with exceptional and unparalleled progress in solar power performance. A perovskite is any material with a specific ABX3 crystal structure. In photovoltaic applications, the A cation can be either organic, inorganic, or hybrid in composition. The B component is typically a metal cation such as lead, and X is a halide such as iodine or bromine. Work on solar cells using perovskite materials has advanced rapidly as a result of the material’s excellent light absorption, charge-carrier mobilities, and lifetimes – resulting in high device efficiencies with low-cost, industry-scalable technology. While the potential for perovskite photovoltaic devices is high, commercialization will require overcoming other challenges relating to material stability, efficiency, and environmental compatibility.


Researchers at NREL have developed a molecular layer that improves perovskite stability. On one side of the device an ionic bond is formed with a perovskite lattice and on the other side a covalent bond is formed with the layer beneath it. The addition of this molecular layer prevents optically bleached layers from migrating from their originally deposited position, as is often seen in current designs of switchable window devices. The perovskite layer can also be patterned to allow for expansion and contraction of the film, enabling devices with more neutral colors and patterns such as stripes.

This technology is within the Device Architecture group of NREL’s perovskite portfolio. For further information regarding NREL's broader perovskite portfolio, please visit NREL's Perovskite Patent Portfolio website.

The Perovskite Device Architecture category comprises new perovskite solar cell device designs, such as interdigitated back-contact perovskite solar cell devices, that capitalize on the unique properties of the perovskite layer to create low-cost devices with improved efficiency and reliability.

  • Enables more stable, durable switchable perovskite devices
  • Enables greater control over aesthetics
Applications and Industries
  • Smart windows
  • Switchable perovskite devices
  • Commercial and residential buildings
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
NREL ROI 18-23PrototypeAvailable04/27/201803/28/2018

Contact NREL About This Technology

To: Bill Hadley<>