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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

In Situ 2D Perovskite Formation and the Impact of the 2D/3D Structures on Performance and Stability of Perovskite Solar Cells

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de Holanda, Matheus S. [1] ; Szostak, Rodrigo [1] ; Marchezi, Paulo E. [1] ; Duarte, Luis G. T. A. [1] ; Germino, Jose C. [1] ; Atvars, Teresa D. Z. [1] ; Nogueira, Ana F. [1]
Total Authors: 7
[1] Univ Campinas UNICAMP, Chem Inst, Lab Nanotecnol & Energia Solar, POB 6154, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: SOLAR RRL; v. 3, n. 9, SI JULY 2019.
Web of Science Citations: 2

Hybrid organic and inorganic perovskite solar cells lack long-term stability, and this negatively impacts the widespread application of this emerging and promising photovoltaic technology. Herein, aiming to increase the stability of perovskite films based on CH3NH3PbI3 and to deeply understand the formation of 2D structures, solutions of alkylammonium chlorides containing 8, 10, and 12 carbons are introduced during the spin-coating on the surface of 3D perovskite films leading to the in situ formation of 2D structures. It is possible to identify the chemical formulae of some 2D structures formed by X-ray diffraction and UV-vis analysis of the modified films. Interestingly, the increase in the stability of the CH3NH3PbI3 films due to the formation of a 2D + 3D perovskite network is only possible in planar TiO2 substrates. The increase in stability of the CH3NH3PbI3 films follows the surfactant molecule order: octylammonium (8C) > decylammonium (1 degrees C) > dodecylammonium (12C) chlorides > standard. An increase of 17.6% in the lifetime of the devices assembled with octylammonium-modified perovskite film is observed compared with that of the standard device, which is directly linked to the improvement of the charge carrier lifetimes obtained from time-correlated single photon counting measurements. (AU)

FAPESP's process: 17/11986-5 - Research Division 1 - dense energy carriers
Grantee:Ana Flávia Nogueira
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 17/12582-5 - Perovskites with mixed cations: relationship between structure, composition, electronic properties and efficiency of solar cells
Grantee:Rodrigo Szostak
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/16245-2 - Photophysical properties of thin films of conjugated polymers
Grantee:Teresa Dib Zambon Atvars
Support type: Regular Research Grants