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Nanocomposite Coatings for Perovskite Solar Cells and Methods of Making the Same

National Renewable Energy Laboratory

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Figure 1
Figure 1

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.


NREL researchers have developed a method to fabricate a hermetically protected perovskite device with enhanced stability. This method consists of first coating an unencapsulated perovskite device with a metal oxide layer using a deposition process (e.g., physical vapor deposition, chemical vapor deposition, or atomic layer deposition) and then coating the metal-oxide layer with a sol-gel coating through either dip coating, spray coating, roll coating, or spin coating. The sol-gel coating used in this method is prepared through either the hydrolysis of a metal alkoxysilane in the presence of water and acid or through the co-polymerization of a metal alkoxysilane, an organically modified alkoxysilane, and a network forming organic molecule. In addition, the resulting device, after being tested in ambient conditions for 24 hours, had a great improvement in stability over an unprotected perovskite device, as demonstrated in Figure 1.

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

The Film Stability category comprises technologies that improve perovskite devices’ resistance to environmental factors that degrade device performance over time. These technologies include methods of depositing perovskite films, encapsulant coatings, and novel film chemistries.

  • Enhances stability
  • Hermetically protects perovskite devices
  • Uses existing deposition and coating methods
Applications and Industries
  • Perovskites
  • Photovoltaics
More Information

For further information on the status of the provisional patent application, please contact Bill Hadley.

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Application 20170301480
An aspect of the present disclosure is a method that includes, in a first mixture that includes a metal alkoxide and water, reacting at least a portion of the metal alkoxide and at least a portion of the water to form a second mixture that includes a solid metal oxide phase dispersed in the second mixture, applying the second mixture onto a surface of a device that includes an intervening layer adjacent to a perovskite layer such that the intervening layer is between the second mixture and perovskite layer, and treating the second mixture, such that the solid metal oxide phase is transformed to a first solid metal oxide layer such that the intervening layer is positioned between the first solid metal oxide layer and the perovskite layer.
National Renewable Energy Laboratory 04/14/2017
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
NREL ROI 15-106PrototypeAvailable01/26/201701/26/2017

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To: Bill Hadley<>