Vitantonio Valenzano - Academia.edu (original) (raw)
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UERJ - Universidade do Estado do Rio de Janeiro / Rio de Janeiro State University
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Papers by Vitantonio Valenzano
The Journal of Physical Chemistry C
Cell Reports Physical Science, 2021
Halide perovskite inks are unstable over time, which negatively effects photovoltaic device perfo... more Halide perovskite inks are unstable over time, which negatively effects photovoltaic device performance. This is due to a reaction between the species in solution, studied here using NMR by Valenzano et al., and the kinetics of this can be tuned by adjusting the components/experimental conditions.
ACS Applied Materials & Interfaces, 2020
Compositional engineering has been a strong tool to improve the quality of the perovskite materia... more Compositional engineering has been a strong tool to improve the quality of the perovskite materials, and in turn the reproducibility of the solar cells. However, the control over the active layer uniformity, one of the most important requirements for the obtainment of efficient devices, is still a weak point of Perovskite Solar Cells (PSCs) manufacturing. Here, we develop an approach to grow a uniform mixed cation perovskite layer, foreseeing its implementation in inverted solar cells endowing organic transporting layers, through the addition of stoiochiometric amount of tropolone as chelating agent for the lead. Thanks to a low melting and boiling temperature, tropolone is present in the system only during the colloidal liquid phase, leaving the film during its formation, this unique characteristic promotes the obtainment of ideal perovskite surface morphologies and an increased short circuit current of photovoltaic devices. A maximum power conversion efficiency of 20 % was obtained, with a 25% increase with respect to the reference. 10 min), then cooled to room temperature. PCBM, BCP and Al layers were deposited as in ref 21. The devices were characterized using the apparatus and methodology described in ref. 21. ASSOCIATED CONTENT Supporting Information Dark and light JV curves; X-Ray diffraction pattern for stability tests.
Journal of Materials Chemistry A, 2021
The innovative two-step Low Vacuum-Proximity Space Effusion (LV-PSE) method exploits the conversi... more The innovative two-step Low Vacuum-Proximity Space Effusion (LV-PSE) method exploits the conversion of a textured PbI2 layer into MAPbI3 by adsorption–incorporation–migration of energetic MAI molecules, thus enabling a best efficiency of 17.5% in 150 nm thick layers.
The Journal of Physical Chemistry C
Cell Reports Physical Science, 2021
Halide perovskite inks are unstable over time, which negatively effects photovoltaic device perfo... more Halide perovskite inks are unstable over time, which negatively effects photovoltaic device performance. This is due to a reaction between the species in solution, studied here using NMR by Valenzano et al., and the kinetics of this can be tuned by adjusting the components/experimental conditions.
ACS Applied Materials & Interfaces, 2020
Compositional engineering has been a strong tool to improve the quality of the perovskite materia... more Compositional engineering has been a strong tool to improve the quality of the perovskite materials, and in turn the reproducibility of the solar cells. However, the control over the active layer uniformity, one of the most important requirements for the obtainment of efficient devices, is still a weak point of Perovskite Solar Cells (PSCs) manufacturing. Here, we develop an approach to grow a uniform mixed cation perovskite layer, foreseeing its implementation in inverted solar cells endowing organic transporting layers, through the addition of stoiochiometric amount of tropolone as chelating agent for the lead. Thanks to a low melting and boiling temperature, tropolone is present in the system only during the colloidal liquid phase, leaving the film during its formation, this unique characteristic promotes the obtainment of ideal perovskite surface morphologies and an increased short circuit current of photovoltaic devices. A maximum power conversion efficiency of 20 % was obtained, with a 25% increase with respect to the reference. 10 min), then cooled to room temperature. PCBM, BCP and Al layers were deposited as in ref 21. The devices were characterized using the apparatus and methodology described in ref. 21. ASSOCIATED CONTENT Supporting Information Dark and light JV curves; X-Ray diffraction pattern for stability tests.
Journal of Materials Chemistry A, 2021
The innovative two-step Low Vacuum-Proximity Space Effusion (LV-PSE) method exploits the conversi... more The innovative two-step Low Vacuum-Proximity Space Effusion (LV-PSE) method exploits the conversion of a textured PbI2 layer into MAPbI3 by adsorption–incorporation–migration of energetic MAI molecules, thus enabling a best efficiency of 17.5% in 150 nm thick layers.