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

doi:10.1088/2053-1591/aab8b4

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

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

4 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 language	English (US)
Article number	045507
Journal	Materials Research Express
Volume	5
Issue number	4
DOIs	https://doi.org/10.1088/2053-1591/aab8b4
State	Published - 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.

Keywords

lead iodide
perovskite
solar cell

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Cite this

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

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.",

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AU - Simon, Terrence

AU - Cui, Tianhong

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AB - 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.

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