Ultrafast and nonlinear optical characterizations of perovskite materials

Our research is based on studying carrier decay channels in hybrid organic inorganic perovskite (HOIPs) materials in ultrafast time scale. HOIPs enable unusual charge carrier interactions among organic and inorganic structural components. Thus, it’s crucial to study carrier dynamics and find out carrier decay pathways to complement further development of devices based on these materials. In order to analyze these materials, we utilize various spectroscopic pump-probe (see Figure) techniques such as time resolved photo-luminescence (TRPL), transient absorption spectroscopy (TAS), photoluminescence and photoluminescence excitation spectroscopy (PL and PLE), time domain terahertz spectroscopy (TDTS).

TAS shows collective all carrier inclusive type of decay channels, while TRPL gives ultra-fast decay of radiative pathways of the carriers. TDTS gives photo-conductivity and free-carrier decay in ultra-fast scale. PL and PLE shows how material emit and if the emission is charge transfer-like emission. Thus, these spectroscopic analyses complete one another and provides us full understanding of carrier pathways in ultrafast time scales such us several picoseconds.

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