TY  - CHAP
AU  - Ponseca, Carlito S.
AB  - 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.
DO  - 10.5772/61631
ID  - OAPEN ID: 612573
ID  - OAPEN ID: OCN: 1030817800
KW  - thz spectroscopy
KW  - time resolved electrical measurement
KW  - photoconductivity
KW  - mobility
KW  - thz spectroscopy
KW  - time resolved electrical measurement
KW  - photoconductivity
KW  - mobility
KW  - Carrier generation and recombination
KW  - Charge carrier
KW  - Chemical kinetics
KW  - Hertz
KW  - Perovskite
KW  - Phenyl-C61-butyric acid methyl ester
KW  - Picosecond
KW  - Solar cell
L1  - https://library.oapen.org/bitstream/id/fa7fc15d-9707-490c-b586-0b5b5da36e00/612573.pdf
LA  - English
LK  - http://library.oapen.org/handle/20.500.12657/32352
PB  - InTechOpen
PY  - 2016
TI  - Chapter 11 Charge Carrier Dynamics in Organometal Halide Perovskite Probed by Time-Resolved Electrical Measurementsnull
ER  - 
