Science· 2013Q1
Long-Range Balanced Electron- and Hole-Transport Lengths in Organic-Inorganic CH <sub>3</sub> NH <sub>3</sub> PbI <sub>3</sub>
- 6,779citations
- Q1SCImago
- 2013year
Short summary
Researchers have demonstrated that solution-processed CH3NH3PbI3 perovskites exhibit balanced electron-hole diffusion lengths of at least 100 nanometers, significantly exceeding the typical 10 nanometer limit for low-temperature photovoltaics.
AI-generated from the title and abstract; the full text is not read.
Key points
- CH3NH3PbI3 perovskites show electron-hole diffusion lengths of at least 100 nm.
- This is a significant improvement over the typical ~10 nm diffusion lengths in low-temperature photovoltaics.
- The long diffusion lengths are comparable to the optical absorption length.
- Femtosecond transient optical spectroscopy was used to measure these lengths.
AI-generated from the title and abstract; the full text is not read.
Abstract
Low-temperature solution-processed photovoltaics suffer from low efficiencies because of poor exciton or electron-hole diffusion lengths (typically about 10 nanometers). Recent reports of highly efficient CH3NH3PbI3-based solar cells in a broad range of configurations raise a compelling case for understanding the fundamental photophysical mechanisms in these materials. By applying femtosecond transient optical spectroscopy to bilayers that interface this perovskite with either selective-electron or selective-hole extraction materials, we have uncovered concrete evidence of balanced long-range electron-hole diffusion lengths of at least 100 nanometers in solution-processed CH3NH3PbI3. The high photoconversion efficiencies of these systems stem from the comparable optical absorption length and charge-carrier diffusion lengths, transcending the traditional constraints of solution-processed semiconductors.
The authors' abstract, as published at the source. Science, 2013 · DOI ↗
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Field: Electrical and Electronic Engineering
Electrical and Electronic EngineeringEngineering