Long Electron-Hole Diffusion Length in High-Quality Lead-Free Double Perovskite Films.
basic_science · Level V
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- Record sourced from PubMed, PMID 29603457.
- Also identified by DOI 10.1002/adma.201706246.
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Abstract
Developing environmentally friendly perovskites has become important in solving the toxicity issue of lead-based perovskite solar cells. Here, the first double perovskite (Cs<sub>2</sub> AgBiBr<sub>6</sub> ) solar cells using the planar structure are demonstrated. The prepared Cs<sub>2</sub> AgBiBr<sub>6</sub> films are composed of high-crystal-quality grains with diameters equal to the film thickness, thus minimizing the grain boundary length and the carrier recombination. These high-quality double perovskite films show long electron-hole diffusion lengths greater than 100 nm, enabling the fabrication of planar structure double perovskite solar cells. The resulting solar cells based on planar TiO<sub>2</sub> exhibit an average power conversion efficiency over 1%. This work represents an important step forward toward the realization of environmentally friendly solar cells and also has important implications for the applications of double perovskites in other optoelectronic devices.