Control of PbI2 nucleation and crystallization: Towards efficient perovskite solar cells based on vapor-assisted solution process

Chongqiu Yang, Yanke Peng, Terrence Simon, Tianhong Cui

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Perovskite solar cells (PSC) have outstanding potential to be low-cost, high-efficiency photovoltaic devices. The PSC can be fabricated by numerous techniques; however, the power conversion efficiency (PCE) for the two-step-processed PSC falls behind that of the one-step method. In this work, we investigate the effects of relative humidity (RH) and dry air flow on the lead iodide (PbI2) solution deposition process. We conclude that the quality of the PbI2 film is critical to the development of the perovskite film and the performance of the PSC device. Low RH and dry air flow used during the PbI2 spin coating procedure can increase supersaturation concentration to form denser PbI2 nuclei and a more suitable PbI2 film. Moreover, airflow-assisted PbI2 drying and thermal annealing steps can smooth transformation from the nucleation stage to the crystallization stage.

Original languageEnglish (US)
Article number045507
JournalMaterials Research Express
Volume5
Issue number4
DOIs
StatePublished - Apr 2018

Bibliographical note

Funding Information:
This work was partially supported by the China Scholarship Council. The fabrication and characterization work were carried out in the Minnesota Nano Center and Characterization Facility, University of Minnesota.

Publisher Copyright:
© 2018 IOP Publishing Ltd.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

Keywords

  • lead iodide
  • perovskite
  • solar cell

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