Science· 2017Q1
Iodide management in formamidinium-lead-halide–based perovskite layers for efficient solar cells
- 5,412citations
- Q1SCImago
- 2017year
Short summary
Adding extra iodide ions to perovskite precursor solutions significantly reduces defect states in the resulting solar cell layers, enabling higher power conversion efficiencies.
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Key points
- Extra iodide ions reduce deep-level defects in perovskite layers.
- Defect reduction improves open-circuit voltage and short-circuit current.
- Achieved 22.1% efficiency in small cells.
- Achieved 19.7% efficiency in 1-square-centimeter cells.
AI-generated from the title and abstract; the full text is not read.
Abstract
The formation of a dense and uniform thin layer on the substrates is crucial for the fabrication of high-performance perovskite solar cells (PSCs) containing formamidinium with multiple cations and mixed halide anions. The concentration of defect states, which reduce a cell's performance by decreasing the open-circuit voltage and short-circuit current density, needs to be as low as possible. We show that the introduction of additional iodide ions into the organic cation solution, which are used to form the perovskite layers through an intramolecular exchanging process, decreases the concentration of deep-level defects. The defect-engineered thin perovskite layers enable the fabrication of PSCs with a certified power conversion efficiency of 22.1% in small cells and 19.7% in 1-square-centimeter cells.
The authors' abstract, as published at the source. Science, 2017 · DOI ↗
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Field: Electrical and Electronic Engineering
Electrical and Electronic EngineeringEngineering