Overcoming Short-Circuit in Lead-Free CH3NH3SnI3 Perovskite Solar Cells via Kinetically Controlled Gas-Solid Reaction Film Fabrication Process

Takamichi Yokoyama, Duyen H. Cao, Constantinos C. Stoumpos, Tze Bin Song, Yoshiharu Sato, Shinji Aramaki, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

The development of Sn-based perovskite solar cells has been challenging because devices often show short-circuit behavior due to poor morphologies and undesired electrical properties of the thin films. A low-temperature vapor-assisted solution process (LT-VASP) has been employed as a novel kinetically controlled gas-solid reaction film fabrication method to prepare lead-free CH3NH3SnI3 thin films. We show that the solid SnI2 substrate temperature is the key parameter in achieving perovskite films with high surface coverage and excellent uniformity. The resulting high-quality CH3NH3SnI3 films allow the successful fabrication of solar cells with drastically improved reproducibility, reaching an efficiency of 1.86%. Furthermore, our Kelvin probe studies show the VASP films have a doping level lower than that of films prepared from the conventional one-step method, effectively lowering the film conductivity. Above all, with (LT)-VASP, the short-circuit behavior often obtained from the conventional one-step-fabricated Sn-based perovskite devices has been overcome. This study facilitates the path to more successful Sn-perovskite photovoltaic research.

Original languageEnglish
Pages (from-to)776-782
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume7
Issue number5
DOIs
Publication statusPublished - Mar 3 2016

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short circuits
Short circuit currents
Lead
solar cells
Gases
Fabrication
fabrication
gases
Perovskite
Thin films
thin films
Perovskite solar cells
Solar cells
Electric properties
Vapors
electrical properties
Doping (additives)
vapors
conductivity
Temperature

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Overcoming Short-Circuit in Lead-Free CH3NH3SnI3 Perovskite Solar Cells via Kinetically Controlled Gas-Solid Reaction Film Fabrication Process. / Yokoyama, Takamichi; Cao, Duyen H.; Stoumpos, Constantinos C.; Song, Tze Bin; Sato, Yoshiharu; Aramaki, Shinji; Kanatzidis, Mercouri G.

In: Journal of Physical Chemistry Letters, Vol. 7, No. 5, 03.03.2016, p. 776-782.

Research output: Contribution to journalArticle

Yokoyama, Takamichi ; Cao, Duyen H. ; Stoumpos, Constantinos C. ; Song, Tze Bin ; Sato, Yoshiharu ; Aramaki, Shinji ; Kanatzidis, Mercouri G. / Overcoming Short-Circuit in Lead-Free CH3NH3SnI3 Perovskite Solar Cells via Kinetically Controlled Gas-Solid Reaction Film Fabrication Process. In: Journal of Physical Chemistry Letters. 2016 ; Vol. 7, No. 5. pp. 776-782.
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