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Tuned Emission of Lead Halide Perovskite Nanocrystals Through Cationic Transformation and Acetate Incorporation

National Renewable Energy Laboratory

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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

Researchers at NREL, the University of Florida and the University of Southern Illinois have invented a process to perform cation substitution to create new perovskite materials with novel properties. By extracting CsBr salt and exposing the remaining material to new salts researchers created nanocrystals with new emission properties and quasi-two-dimensional networked layers resulting in sheets with light emission properties that are narrow, tunable and bright. Additionally, the tunability of these new materials make them well suited for use in tandem architecture photovoltaic applications.

This technology is within the Film Chemistry 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 Film Chemistry category consists of alternative film chemistries to the common methylammonium lead halide (CH3NH3PbI3) perovskite devices. These alternative film compositions have been shown to improve the performance of perovskite films, demonstrating both increased stability and efficiency, and to enable perovskite use in alternative mediums such as quantum dots.

Benefits
  • Tunable perovskite films
  • Bright, narrow emission spectra
Applications and Industries
  • Perovskites
  • Photovoltaics
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
NREL ROI 18-43PrototypeAvailable04/27/201804/27/2018

Contact NREL About This Technology

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