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Controlling Interconnection Contact Layer Structure/Materials to Enable High Performance Perovskite Solar Modules

Stage: Development

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.

Most perovskite research to date has been focused on lab-scale, single cell devices. These devices are less than 1 cm2 in area and are fabricated using spin coating, a method that is unsuitable for full scale production of large area solar modules. For perovskite innovations to be adopted in practical applications and commercial use, scalable deposition processes must be developed for perovskites.

Researchers at NREL have invented a perovskite device that may be fabricated using techniques suitable for large scale manufacturing. The device, which includes four cells and has an aperture area of over 10 cm2, demonstrates among the highest efficiencies of perovskite solar modules fabricated by scalable deposition methods. To create the device researchers developed procedures to scribe the sub cells and create interconnections between cells that are also fully scalable. Cell layer deposition is accomplished through well understood manufacturing methods such as blade coating, inkjet printing, and spray pyrolysis. Together, these innovations make the use of perovskites in real world applications possible.

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

Please contact Bill Hadley at Bill.Hadley@nrel.gov


ROI 17-92

Applications and Industries

  • Perovskites
  • Photovoltaics


  • High efficiency perovskite modules
  • Suitable for low cost, industrial manufacturing