NDLI: Formamidinium lead trihalide: a broadly tunable perovskite for efficient planar heterojunction solar cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Herz, Laura M. Menelaou, Christopher Johnston, Michael B. Stranks, Samuel D. Snaith, Henry J. Eperon, Giles E.
Copyright Year	2014
Abstract	Perovskite-based solar cells have attracted significant recent interest, with power conversion efficiencies in excess of 15% already superceding a number of established thin-film solar cell technologies. Most work has focused on a methylammonium lead trihalide perovskites, with a bandgaps of ∼1.55 eV and greater. Here, we explore the effect of replacing the methylammonium cation in this perovskite, and show that with the slightly larger formamidinium cation, we can synthesise formamidinium lead trihalide perovskites with a bandgap tunable between 1.48 and 2.23 eV. We take the 1.48 eV-bandgap perovskite as most suited for single junction solar cells, and demonstrate long-range electron and hole diffusion lengths in this material, making it suitable for planar heterojunction solar cells. We fabricate such devices, and due to the reduced bandgap we achieve high short-circuit currents of >23 mA cm−2, resulting in power conversion efficiencies of up to 14.2%, the highest efficiency yet for solution processed planar heterojunction perovskite solar cells. Formamidinium lead triiodide is hence promising as a new candidate for this class of solar cell.
Starting Page	982
Ending Page	988
Page Count	7
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	7
Issue Number	3
Journal	Energy & Environmental Science
DOI	10.1039/c3ee43822h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Thin-film solar cell Electronvolt Ion Perovskite Amidine Band gap Diffusion Heterojunction Triiodide Solar cell
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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