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Charge Carrier Dynamics in Organometal Halide Perovskite Probed by Time-Resolved Electrical Measurements (Book chapter)

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ISBN: 9789535122456 Year: DOI: 10.5772/61631 Language: English
Publisher: IntechOpen Grant: FP7 Ideas: European Research Council - 226136
Subject: Science (General)
Added to DOAB on : 2019-01-17 11:48:00
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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.

Mobilities, Tourism and Travel Behavior - Contexts and Boundaries

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ISBN: 9789535137269 9789535137276 9789535140368 Year: Pages: 250 DOI: 10.5772/intechopen.68212 Language: English
Publisher: IntechOpen
Subject: Economics
Added to DOAB on : 2019-10-03 07:51:50

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The notion of ""mobilities,"" when looked at from a practical point of view, turns out to cover different kinds of human activity. It is not surprising, then, that when approached from an academic perspective, it reveals enormous potential for interdisciplinary research, which has proven extremely attractive to many scholars from different continents, disciplines, and schools of academic inquiry. The scholars in this volume focus on the specific aspects of mobilities, namely, tourism and travel behavior, but approach them from a plethora of positions. Such a myriad of perspectives is bound to be challenging in methodological terms, but it seems there is a growing agreement as to the worthiness of this interdisciplinary research. By means of combining various approaches, researchers obtain access to a fascinating and increasingly ubiquitous phenomenon of contemporary human mobility.

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