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Tuning optical/electrical properties of 2D/3D perovskite by the inclusion of aromatic cation

Tuning optical/electrical properties of 2D/3D perovskite by the inclusion of aromatic cation

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RODRÍGUEZ-ROMERO, Jesús, Bruno CLASEN HAMES, Pavel GALAR, Azhar FAKHARUDDIN, Isaac SUAREZ, Lukas SCHMIDT-MENDE, Juan P. MARTÍNEZ-PASTOR, Abderrazzak DOUHAL, Iván MORA-SERÓ, Eva M. BAREA, 2018. Tuning optical/electrical properties of 2D/3D perovskite by the inclusion of aromatic cation. In: Physical Chemistry Chemical Physics. 20(48), pp. 30189-30199. ISSN 1463-9076. eISSN 1463-9084. Available under: doi: 10.1039/C8CP06418K

@article{RodriguezRomero2018-12-12Tunin-44476, title={Tuning optical/electrical properties of 2D/3D perovskite by the inclusion of aromatic cation}, year={2018}, doi={10.1039/C8CP06418K}, number={48}, volume={20}, issn={1463-9076}, journal={Physical Chemistry Chemical Physics}, pages={30189--30199}, author={Rodríguez-Romero, Jesús and Clasen Hames, Bruno and Galar, Pavel and Fakharuddin, Azhar and Suarez, Isaac and Schmidt-Mende, Lukas and Martínez-Pastor, Juan P. and Douhal, Abderrazzak and Mora-Seró, Iván and Barea, Eva M.} }

Fakharuddin, Azhar Suarez, Isaac Barea, Eva M. Galar, Pavel Clasen Hames, Bruno Mora-Seró, Iván Martínez-Pastor, Juan P. 2019-01-09T10:57:48Z Suarez, Isaac Fakharuddin, Azhar Mora-Seró, Iván Douhal, Abderrazzak Galar, Pavel 2019-01-09T10:57:48Z Tuning optical/electrical properties of 2D/3D perovskite by the inclusion of aromatic cation 2018-12-12 Barea, Eva M. Rodríguez-Romero, Jesús The employment of bulky aliphatic cations in the manufacture of moisture-stable materials has triggered the development and application of 2D/3D perovskites as sensitizers in moisture-stable solar cells. Although it is true that the moisture stability increases, it is also true that the photovoltaic performance of 2D/3D PVK materials is severely limited owing to quantum and dielectric confinement effects. Accordingly, it is necessary the synthesis and deep optical characterization of materials with an adequate management of dielectric contrast between the layers. Here, we demonstrate the successful tuning of dielectric confinement by the inclusion of a conjugated molecule, as a bulky cation, in the fabrication of the 2D/3D PVK material (C<sub>6</sub>H<sub>5</sub>NH<sub>3</sub>)<sub>2</sub>(CH<sub>3</sub>NH<sub>3</sub>)<sub>n−1</sub>Pb<sub>n</sub>I<sub>3n+1</sub>, where n = 3 or 5. The absence of excitonic states related to n ≥ 1 at room temperature, as well as the very low concentration of excitons after 1 ps of excitation of samples in which n ≥ 3, provide strong evidence of an excellent ability to dissociate excitons into free charge carriers. As consequence films with low n, presenting higher stability than standard 3D perovskites, improved significantly their performance, showing one of the highest short circuit current density (J<sub>sc</sub> ≈ 13.8) obtained to date for perovskite materials within the 2D limit (n < 10). Schmidt-Mende, Lukas Douhal, Abderrazzak Rodríguez-Romero, Jesús Schmidt-Mende, Lukas eng Clasen Hames, Bruno Martínez-Pastor, Juan P.

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