Journal
SCIENCE
Volume 342, Issue 6156, Pages 341-344Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1243982
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Funding
- Engineering and Physical Sciences Research Council
- European Research Council (ERC-StG 2011 HYPER project) [279881]
- Oxford Photovoltaics through a Nanotechnology KTN CASE award
- Royal Society Wolfson exchange grant
- Worcester College, Oxford
- Engineering and Physical Sciences Research Council [EP/H015701/1, 1511477] Funding Source: researchfish
- EPSRC [EP/H015701/1] Funding Source: UKRI
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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 (CH3NH3PbI3-xClx) 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 similar to 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.
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