Publication | Open Access
Optical Properties of Two-Dimensional Perovskite Films of (C<sub>6</sub>H<sub>5</sub>C<sub>2</sub>H<sub>4</sub>NH<sub>3</sub>)<sub>2</sub>[PbI<sub>4</sub>] and (C<sub>6</sub>H<sub>5</sub>C<sub>2</sub>H<sub>4</sub>NH<sub>3</sub>)<sub>2</sub> (CH<sub>3</sub>NH<sub>3</sub>)<sub>2</sub>[Pb<sub>3</sub>I<sub>10</sub>]
58
Citations
42
References
2018
Year
The temperature dependence of absorption and photoluminescence (PL) spectroscopies were used to study the optical properties of 2D perovskite films, including n = 1 and 3 of (PEA)<sub>2</sub>(CH<sub>3</sub>NH<sub>3</sub>) <sub>n-1</sub>[Pb <sub>n</sub>I<sub>3 n+1</sub>] (PEA = C<sub>6</sub>H<sub>5</sub>(CH<sub>2</sub>)<sub>2</sub>NH<sub>3</sub>). In (PEA)<sub>2</sub>[Pb<sub>1</sub>I<sub>4</sub>] (PEPI), excitons coupling to optical phonons with an average energy of ∼30 meV dominate the photophysics of absorption and PL. (PEA)<sub>2</sub>(CH<sub>3</sub>NH<sub>3</sub>)<sub>2</sub>[Pb<sub>3</sub>I<sub>10</sub>] (shortened as PMPI<sub>3</sub>), nominally prepared as n = 3, actually was a mixture of multiple layered perovskites with various n. In absorption, a PMPI<sub>3</sub> film presents respective n materials' excitonic features, coupling to phonons with an average energy of ∼30 meV; in analyzing PL peaked singly at ∼1.6 eV and its width as a function of temperature, we found that PMPI<sub>3</sub> behaves like PEPI at around 80 K but like 3D perovskite near room temperature, with three times larger electron-phonon interaction strength compared to that in PEPI.
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