Proceedings of Perovskite Thin Film Photovoltaics (ABXPV)
Publication date: 14th December 2015
The dependence of the final performance on the morphology and chemistry of the MAPbI3 layer interfaces within the different architectures of the devices and the influence of the ambient conditions is an investigation issue that is under the spot light [[1],[2]]. We investigate the photoluminescence (PL) properties and morphology relationship of prototypical hybrid perovskite CH3NH3PbI3-xClx thin films deposited on different substrates: bare glass, commercial fluorine doped SnO2 (FTO) on glass or compact TiO2 layer on glass/FTO substrates (FTO/TiO2) and compare their properties with crystals (tens of microns in size) obtained dispersing CH3NH3PbI3 in toluene and deposited by spin coating and cured at 90º one hour in N2 ambient. Under 488 nm laser excitation wavelength (0.015 W/cm2), we have observed a PL evolution with irradiation time for all samples which is clearly different from crystals to thin films. For MAPbI3 larger crystals PL intensity increases up to 50 fold after 5 min illumination time and exhibits two bands (at 798 and 770 nm) whose wavelenghts and relative weight also evolves with irradiation time. However, thin films show one band PL spectra peaking at 775 nm previously reported, but the time dependence of the intensity is dependent on the underneath layer. The most intense and stable emission upon laser irradiation corresponds to the glass/FTO/TiO2/MAPbI3-xClx sample, together with the greater life time. XRD analysis reveals that the c-axis is exclusively parallel to the substrate for all films but differences are observed for the one with TiO2 layer. A preliminary Rietveld analysis of the powder sample was also performed for comparison. These observations will be discussed based on results collected from a variety of complementary analytical techniques, including AFM, XRD, micro Raman and photoluminescence studies. We speculate that non-radiative states and disorder are responsible of the structured and weaker emission found in larger crystals that are disabled through a reaction involving light and ambient oxygen.
[1]- Andrea Listorti, Emilio J. Juarez-Perez, Carlos Frontera, Vittoria Roiati,Laura Garcia-Andrade,Silvia Colella, Aurora Rizzo, Pablo Ortiz, Ivan Mora-Sero. Effect of Mesostructured Layer upon Crystalline Properties and Device Performance on Perovskite Solar Cells. J. Phys. Chem. Lett. 2015, 6, 1628−1637.
[2]- YuxiTian, Maximilian Peter, Eva Unger, Mohamed Abdellah, Kaibo Zheng, TõnuPullerits, ArkadyYartsev, VillySundströma and Ivan G. Scheblykin. Mechanistic insights into perovskite photoluminescence enhancement: light curing with oxygen can boost yield thousand fold. Phys. Chem. Chem. Phys., 2015,17, 24978-24987.
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