A Strategy to Produce High Efficiency, High Stability Perovskite Solar Cells Using Functionalized Ionic Liquid-Dopants

Yi Zhang; Zhaofu Fei; Peng Gao; Yonghui Lee; Farzaneh Fadaei Tirani; Rosario Scopelliti; Yaqing Feng; Paul J Dyson; Mohammad Khaja Nazeeruddin

doi:10.1002/adma.201702157

A Strategy to Produce High Efficiency, High Stability Perovskite Solar Cells Using Functionalized Ionic Liquid-Dopants

Adv Mater. 2017 Sep;29(36). doi: 10.1002/adma.201702157. Epub 2017 Jul 25.

Authors

Yi Zhang^{1

2}, Zhaofu Fei³, Peng Gao¹, Yonghui Lee¹, Farzaneh Fadaei Tirani³, Rosario Scopelliti³, Yaqing Feng², Paul J Dyson³, Mohammad Khaja Nazeeruddin¹

Affiliations

¹ Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1951, Sion, Switzerland.
² School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
³ Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland.

PMID: 28741706
DOI: 10.1002/adma.201702157

Abstract

Functionalized imidazolium iodide salts (ionic liquids) modified with CH₂ CHCH₂ , CH₂ CCH, or CH₂ CN groups are applied as dopants in the synthesis of CH₃ NH₃ PbI₃ -type perovskites together with a fumigation step. Notably, a solar cell device prepared from the perovskite film doped with the salt containing the CH₂ CHCH₂ side-chain has a power conversion efficiency of 19.21%, which is the highest efficiency reported for perovskite solar cells involving a fumigation step. However, doping with the imidazolium salts with the CH₂ CCH and CH₂ CN groups result in perovskite layers that lead to solar cell devices with similar or lower power conversion efficiencies than the dopant-free cell.

Keywords: fumigation; ionic liquids; perovskite solar cells; perovskites; solar cells.