Journal
ADVANCED MATERIALS
Volume 30, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706246
Keywords
double perovskite; lead free; long diffusion length; planar solar cell
Categories
Funding
- Joint NTU-LiU PhD programme on Materials- and Nanoscience
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO Mat LiU) [200900971]
- European Commission Marie Sklodowska-Curie actions [691210]
- European Commission SOLAR-ERA.NET
- Swedish Energy Agency (Energimyndigheten)
- Swedish Research Council (FORMAS)
- China Scholarship Council
- Singapore Ministry of Education Academic Research Fund [RG101/15, RG173/16, MOE2014-T2-1-044, MOE2015-T2-2-015, MOE2016-T2-1-034]
- Singapore National Research Foundation [NRF-CRP14-2014]
- Knut and Alice Wallenberg (KAW) Foundation [2016.0358]
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Developing environmentally friendly perovskites has become important in solving the toxicity issue of lead-based perovskite solar cells. Here, the first double perovskite (Cs2AgBiBr6) solar cells using the planar structure are demonstrated. The prepared Cs2AgBiBr6 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 TiO2 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.
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