AI Article Synopsis
- Engineering film crystallization is crucial for enhancing all-inorganic perovskite solar cells' performance beyond just surface passivation.
- A new method using urea-ammonium thiocyanate (UAT) has been developed to improve the quality of CsPbI films by leveraging coordination activities of SCN.
- This approach resulted in enhanced crystal quality, a charge recombination lifetime of over 30 ns, and boosted cell efficiency to over 20% with excellent stability for over 1000 hours.
Article Abstract
Besides widely used surface passivation, engineering the film crystallization is an important and more fundamental route to improve the performance of all-inorganic perovskite solar cells. Herein, we have developed a urea-ammonium thiocyanate (UAT) molten salt modification strategy to fully release and exploit coordination activities of SCN to deposit high-quality CsPbI film for efficient and stable all-inorganic solar cells. The UAT is derived by the hydrogen bond interactions between urea and NH from NH SCN. With the UAT, the crystal quality of the CsPbI film has been significantly improved and a long single-exponential charge recombination lifetime of over 30 ns has been achieved. With these benefits, the cell efficiency has been promoted to over 20 % (steady-state efficiency of 19.2 %) with excellent operational stability over 1000 h. These results demonstrate a promising development route of the CsPbI related photoelectric devices.
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| http://dx.doi.org/10.1002/anie.202102466 | DOI Listing |
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