Abstract
Hybrid perovskite semiconductors have attracted strong scientific interest for optoelectronic applications. Despite the current drive for higher optoelectronic device efficiencies and stabilities, little information exists about the fundamental non-equilibrium interactions of photo-excited charge carriers in these materials. Time-resolved experiments with ultrashort laser pulses have been used to study the carrier dynamics in hybrid perovskites with transient absorption techniques. The cooling process was found to occur on 100s of femtosecond timescales [1–3], with a strong contribution from a hot phonon effect. The carrier thermalization process is expected to occur on much faster timescales [4–6] with seminal studies of thermalization dynamics in GaAs reported timescales ranging from 100 fs to 4 ps [5,7,8]. These results provided insights into dephasing times [7], band structure [5], and carrier-carrier scattering processes [9]. However, the initial build-up of the thermal distribution is typically difficult to resolve due to the requirement of high resolution, both in time and in energy.
© 2017 IEEE
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