4 years ago

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

A Strategy to Produce High Efficiency, High Stability Perovskite Solar Cells Using Functionalized Ionic Liquid-Dopants
Zhaofu Fei, Paul J. Dyson, Yonghui Lee, Rosario Scopelliti, Farzaneh Fadaei Tirani, Yi Zhang, Yaqing Feng, Mohammad Khaja Nazeeruddin, Peng Gao
Functionalized imidazolium iodide salts (ionic liquids) modified with CH2CHCH2, CH2CCH, or CH2CN groups are applied as dopants in the synthesis of CH3NH3PbI3-type perovskites together with a fumigation step. Notably, a solar cell device prepared from the perovskite film doped with the salt containing the CH2CHCH2 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 CH2CCH and CH2CN groups result in perovskite layers that lead to solar cell devices with similar or lower power conversion efficiencies than the dopant-free cell. Perovskite films, grown from PbI2:MAI in DMSO in the presence of functionalized ionic liquid (imidazolium iodide) dopants and incorporated into perovskite solar cells, are reported. One cell has a power conversion efficiency exceeding 19%. Difference in power conversion efficiency can be traced to the physical properties of imidazolium-PbI3 salts that form during the preparation of the film.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201702157

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