Science· 2013Q1
Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite Absorber
- 10,300citations
- Q1SCImago
- 2013year
Short summary
Organometal trihalide perovskites, used in solar cells, now show electron-hole diffusion lengths greater than 1 micrometer in mixed halide compositions, an order of magnitude beyond their absorption depth.
AI-generated from the title and abstract; the full text is not read.
Key points
- Electron-hole diffusion lengths over 1 micrometer were achieved in mixed halide perovskites.
- This is 10x longer than the absorption depth of the material.
- Pure triiodide perovskites showed diffusion lengths of only ~100 nanometers.
- Findings support the efficiency of planar heterojunction perovskite solar cells.
AI-generated from the title and abstract; the full text is not read.
Abstract
Organic-inorganic perovskites have shown promise as high-performance absorbers in solar cells, first as a coating on a mesoporous metal oxide scaffold and more recently as a solid layer in planar heterojunction architectures. Here, we report transient absorption and photoluminescence-quenching measurements to determine the electron-hole diffusion lengths, diffusion constants, and lifetimes in mixed halide (CH3NH3PbI(3-x)Cl(x)) and triiodide (CH3NH3PbI3) perovskite absorbers. We found that the diffusion lengths are greater than 1 micrometer in the mixed halide perovskite, which is an order of magnitude greater than the absorption depth. In contrast, the triiodide absorber has electron-hole diffusion lengths of ~100 nanometers. These results justify the high efficiency of planar heterojunction perovskite solar cells and identify a critical parameter to optimize for future perovskite absorber development.
The authors' abstract, as published at the source. Science, 2013 · DOI ↗
Continue with a free account
Ask the paper: 3 free questions a day about this paper; save it, get its citation, new summaries every day for your field. Takeaways are Premium.
Continue free on the webSign in with Google or Apple; no card needed. You come back to this paper.
On your phone:
Field: Electrical and Electronic Engineering
Electrical and Electronic EngineeringEngineering