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Unravelling the mechanism of photoinduced charge transfer processes in lead iodide perovskite solar cells
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Unravelling the mechanism of photoinduced charge transfer processes in lead iodide perovskite solar cells
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Journal Article
Unravelling the mechanism of photoinduced charge transfer processes in lead iodide perovskite solar cells
2014
Overview
Lead halide perovskites have recently been used as light absorbers in hybrid organic–inorganic solid-state solar cells, with efficiencies as high as 15% and open-circuit voltages of 1 V. However, a detailed explanation of the mechanisms of operation within this photovoltaic system is still lacking. Here, we investigate the photoinduced charge transfer processes at the surface of the perovskite using time-resolved techniques. Transient laser spectroscopy and microwave photoconductivity measurements were applied to TiO
2
and Al
2
O
3
mesoporous films impregnated with CH
3
NH
3
PbI
3
perovskite and the organic hole-transporting material
spiro
-OMeTAD. We show that primary charge separation occurs at both junctions, with TiO
2
and the hole-transporting material, simultaneously, with ultrafast electron and hole injection taking place from the photoexcited perovskite over similar timescales. Charge recombination is shown to be significantly slower on TiO
2
than on Al
2
O
3
films.
Perovskite solar cells are currently generating great interest in the photovoltaics community, but a detailed understanding of why they are so efficient is lacking. Femtosecond laser spectroscopy and microwave photoconductivity measurements now reveal important insights into the photoinduced charge transfer processes and dynamics of such cells.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
