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Heterojunction Perovskite Photovoltaic Devices and Methods of Making the Same

National Renewable Energy Laboratory

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PDF Document PublicationPCT/US16/55154 (1,972 KB)

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 novel perovskite device architecture that incorporates interdigitated contact geometry comprising of alternating lateral p-n junctions across the perovskite active layer. This architecture uses the interdigitated electrode as the back contact to drive photogenerated carriers to the n- or p-type contact layers and can be constructed with either top-down or bottom-up configurations (i.e. glass/perovskite active layer/contact or glass/contact/perovskite active layer). Furthermore, this architecture maximizes photo-carrier collection, and can be implemented through direct-write, high-throughput electronic printing, or through traditional photolithograph processes. In addition, NREL researchers have used metal wires as the electrode and substrate for electron- or hole-transport layers to create threads that, when woven together, form flexible, defect-tolerant fabric with PV functionality.

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

The Film Efficiency category consists of film deposition methods, chemistry improvements, and engineering of device layer and architecture that push commercial perovskite device efficiencies to 20% and beyond.

The Device Architecture category comprises new perovskite solar cell device layouts, 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.

  • Defect Tolerant
  • Maximizes photo-carrier collection
  • Can be constructed in either top-down or bottom-up configurations
Applications and Industries
  • Perovskites
  • Photovoltaics
More Information

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

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Application 20180269005
An aspect of the present disclosures is a method that includes applying a perovskite precursor solution to a first solid conductor and treating the perovskite precursor solution such that a first portion of the perovskite precursor solution is converted to a first solid perovskite, where the first solid conductor comprises a first charge transport characteristic, which is predominantly p-type or predominantly n-type, and the treating results in the first solid perovskite having a second charge transport characteristic that is substantially the same as the first charge transport characteristic.
National Renewable Energy Laboratory 10/03/2016
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
NREL ROI 15-60PrototypeAvailable01/26/201701/26/2017

Contact NREL About This Technology

To: Bill Hadley<>