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The role of a vapor-assisted solution process on tailoring the chemical composition and morphology of mixed-halide perovskite solar cells

Tafazoli, S ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1039/c8ce00628h
  3. Publisher: Royal Society of Chemistry , 2018
  4. Abstract:
  5. Herein, we report a modified two-step method to construct a uniform and pinhole-free polycrystalline perovskite film with large grains up to the microscale using lead mixed-halide (PbI2-PbCl2) precursor solutions to guarantee the device functioning. Commonly used sequential deposition methods based on dip- and spin-coatings are combined with a vapor-assisted solution process to improve the perovskite morphology and tune the residual lead mixed-halides. These can enhance the optical absorption and efficiency of perovskite solar cell (PSC) devices. The impact of the Cl content in the lead mixed-halide precursors and the employed preparation methods on the photovoltaic performance of PSCs are studied. The highest performance of PSC is obtained for a vapor-treated film containing 2 mol% PbCl2 deposited by spin-coating, showing a 56% increase in photoconversion efficiency compared to the pristine PbI2-based device. © 2018 The Royal Society of Chemistry
  6. Keywords:
  7. Coatings ; Efficiency ; Layered semiconductors ; Light absorption ; Perovskite ; Perovskite solar cells ; Solar cells ; Chemical compositions ; Modified two-step method ; Photoconversion efficiency ; Photovoltaic performance ; Polycrystalline perovskite ; Precursor solutions ; Preparation method ; Sequential deposition ; Lead compounds
  8. Source: CrystEngComm ; Volume 20, Issue 31 , 2018 , Pages 4428-4435 ; 14668033 (ISSN)
  9. URL: https://pubs.rsc.org/en/content/articlelanding/2018/CE/C8CE00628H#!divAbstract