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oapen-20.500.12657-323522021-11-12T16:37:08Z Chapter 11 Charge Carrier Dynamics in Organometal Halide Perovskite Probed by Time-Resolved Electrical Measurements Ponseca, Carlito S. thz spectroscopy time resolved electrical measurement photoconductivity mobility thz spectroscopy time resolved electrical measurement photoconductivity mobility Carrier generation and recombination Charge carrier Chemical kinetics Hertz Perovskite Phenyl-C61-butyric acid methyl ester Picosecond Solar cell bic Book Industry Communication::P Mathematics & science::PD Science: general issues This chapter presents the fate of the charge carriers from the moment of its photogeneration in the perovskite to injection and transport into electrodes. Time-resolved electrical measurement techniques, terahertz (THz) spectroscopy and microwave (MW) conductivity, are primarily used to deconvolute ultrafast processes and to directly access behavior of charged species from the ps to µs timescales. Transient absorption and photoluminescence spectroscopy were also utilized to gain insight on carrier population dynamics and radiatively recombining charges. Photogenerated charged species were converted into highly mobile charges (µe = 12.5 cm2V-1s-1 and µh = 7.5 cm2V-1s-1) almost instantaneously (< 0.2 ps), while the remaining loosely bounded excitons dissociate into mobile charges after 2-3 ps. This high mobility is maintained for at least 1 ns as obtained by THz spectroscopy, while its lifetime is at least few tens of µs as measured by the MW conductivity technique. Lowering the temperature increases carrier mobilities with T-1.6.Dependence and a 75 meV barrier energy is required for temperature-activated recombination. Finally, injection of hole from MAPbI3 to Spiro-OMeTAD was found to be ultrafast and the state and population of dark holes dictate its recombination. 2019-10-04 14:25:37 2020-04-01T14:07:06Z 2016-08-01 23:55 2019-10-04 14:25:37 2020-04-01T14:07:06Z 2016-12-31 23:55:55 2019-10-04 14:25:37 2020-04-01T14:07:06Z 2020-04-01T14:07:06Z 2016 chapter 612573 OCN: 1030817800 http://library.oapen.org/handle/20.500.12657/32352 eng application/pdf n/a 612573.pdf InTechOpen Perovskite Materials - Synthesis, Characterisation, Properties, and Applications 10.5772/61631 10.5772/61631 09f6769d-48ed-467d-b150-4cf2680656a1 2872576b-5633-4781-8179-aa676ca35865 7292b17b-f01a-4016-94d3-d7fb5ef9fb79 European Research Council (ERC) 1 226136 FP7 FP7 Ideas: European Research Council FP7-IDEAS-ERC - Specific Programme: "Ideas" Implementing the Seventh Framework Programme of the European Community for Research, Technological Development and Demonstration Activities (2007 to 2013) open access
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This chapter presents the fate of the charge carriers from the moment of its photogeneration in the perovskite to injection and transport into electrodes. Time-resolved electrical measurement techniques, terahertz (THz) spectroscopy and microwave (MW) conductivity, are primarily used to deconvolute ultrafast processes and to directly access behavior of charged species from the ps to µs timescales. Transient absorption and photoluminescence spectroscopy were also utilized to gain insight on carrier population dynamics and radiatively recombining charges. Photogenerated charged species were converted into highly mobile charges (µe = 12.5 cm2V-1s-1 and µh = 7.5 cm2V-1s-1) almost instantaneously (< 0.2 ps), while the remaining loosely bounded excitons dissociate into mobile charges after 2-3 ps. This high mobility is maintained for at least 1 ns as obtained by THz spectroscopy, while its lifetime is at least few tens of µs as measured by the MW conductivity technique. Lowering the temperature increases carrier mobilities with T-1.6.Dependence and a 75 meV barrier energy is required for temperature-activated recombination. Finally, injection of hole from MAPbI3 to Spiro-OMeTAD was found to be ultrafast and the state and population of dark holes dictate its recombination.
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