Energy & Environmental Science· 2014Q1
Formamidinium lead trihalide: a broadly tunable perovskite for efficient planar heterojunction solar cells
- 4,076citations
- Q1SCImago
- 2014year
Short summary
Replacing methylammonium with formamidinium cations in lead trihalide perovskites tunes the bandgap from 1.48 to 2.23 eV, enabling planar heterojunction solar cells with >23 mA cm−2 short-circuit currents and up to 14.2% power conversion efficiency.
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Key points
- Formamidinium lead trihalide perovskites offer tunable bandgaps between 1.48 and 2.23 eV.
- The 1.48 eV-bandgap material exhibits long electron and hole diffusion lengths.
- Planar heterojunction solar cells fabricated with this perovskite achieved >23 mA cm−2 short-circuit currents.
- The devices reached a power conversion efficiency of up to 14.2%, the highest for solution-processed planar heterojunction perovskite solar cells.
AI-generated from the title and abstract; the full text is not read.
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.
The authors' abstract, as published at the source. Energy & Environmental Science, 2014 · DOI ↗
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Field: Electrical and Electronic Engineering
Electrical and Electronic EngineeringEngineering