Alkali metal halide salts as interface additives to fabricate hysteresis-free hybrid perovskite-based photovoltaic devices

Lili Wang, Dhanashree Moghe, Soroush Hafezian, Pei Chen, Margaret Young, Mark Elinski, Ludvik Martinu, Stéphane Kéna-Cohen, Richard R. Lunt

Research output: Contribution to journalArticle

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Abstract

A new method was developed for doping and fabricating hysteresis-free hybrid perovskite-based photovoltaic devices by using alkali metal halide salts as interface layer additives. Such salt layers introduced at the perovskite interface can provide excessive halide ions to fill vacancies formed during the deposition and annealing process. A range of solution-processed halide salts were investigated. The highest performance of methylammonium lead mixed-halide perovskite device was achieved with a NaI interlayer and showed a power conversion efficiency of 12.6% and a hysteresis of less than 2%. This represents a 90% improvement compared to control devices without this salt layer. Through depth-resolved mass spectrometry, optical modeling, and photoluminescence spectroscopy, this enhancement is attributed to the reduction of iodide vacancies, passivation of grain boundaries, and improved hole extraction. Our approach ultimately provides an alternative and facile route to high-performance and hysteresis-free perovskite solar cells.

LanguageEnglish (US)
Pages23086-23094
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number35
DOIs
StatePublished - Sep 7 2016

Profile

Alkali Metals
Metal halides
Alkali metals
Perovskite
Hysteresis
Salts
Vacancies
Photoluminescence spectroscopy
Iodides
Passivation
Conversion efficiency
Mass spectrometry
Grain boundaries
Lead
Doping (additives)
Annealing
Ions
perovskite

Keywords

  • alkali metal halide salt
  • doping
  • hole extraction
  • hysteresis
  • iodide vacancies
  • passivation
  • perovskite photovoltaics

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Alkali metal halide salts as interface additives to fabricate hysteresis-free hybrid perovskite-based photovoltaic devices. / Wang, Lili; Moghe, Dhanashree; Hafezian, Soroush; Chen, Pei; Young, Margaret; Elinski, Mark; Martinu, Ludvik; Kéna-Cohen, Stéphane; Lunt, Richard R.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 35, 07.09.2016, p. 23086-23094.

Research output: Contribution to journalArticle

Wang, L, Moghe, D, Hafezian, S, Chen, P, Young, M, Elinski, M, Martinu, L, Kéna-Cohen, S & Lunt, RR 2016, 'Alkali metal halide salts as interface additives to fabricate hysteresis-free hybrid perovskite-based photovoltaic devices' ACS Applied Materials and Interfaces, vol 8, no. 35, pp. 23086-23094. DOI: 10.1021/acsami.6b07368
Wang, Lili ; Moghe, Dhanashree ; Hafezian, Soroush ; Chen, Pei ; Young, Margaret ; Elinski, Mark ; Martinu, Ludvik ; Kéna-Cohen, Stéphane ; Lunt, Richard R./ Alkali metal halide salts as interface additives to fabricate hysteresis-free hybrid perovskite-based photovoltaic devices. In: ACS Applied Materials and Interfaces. 2016 ; Vol. 8, No. 35. pp. 23086-23094
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