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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 halides (e.g. CH3NH3PbI3 or MAPbI3) are a new class of light absorbers with exceptional and unparalleled progress in solar cell performance. A perovskite is any material with a specific ABX3 crystal structure, wherein an organic based cation is A, a metal cation is B, and a divalent halide anion is X. Work on solar cells using these perovskite materials has advanced rapidly as a result of the material’s excellent light absorption, charge-carrier mobilities, and lifetimes that result in high device efficiency with low-cost, industry-scalable technology. However, this potential for low cost and scalability requires overcoming barriers hindering the commercialization of perovskite devices related to perovskite stability, efficiency, and environmental compatibility. NREL researchers have made significant technical contributions within six areas critical to developing commercialized perovskite devices, which include increases in film efficiency and stability and innovations in perovskite film deposition methods, film chemistry, hole and electron extraction layer engineering, and device architecture.

Description

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.

Benefits
  • 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.

Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
NREL ROI 15-106PrototypeAvailable01/26/201701/26/2017

Contact NREL About This Technology

To: Bill Hadley<bill.hadley@nrel.gov>