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Effect of photoanode structure and sensitization conditions on the photovoltaic response of dye-sensitized solar cells

Gnida Paweł, Slodek Aneta, Schab-Balcerzak Ewa

Opto-Electronics Review

2022

Vol. 30, No. 1

art. no. e140739

This work summarises investigations focused on the photoanode impact on the photovoltaic response of dye-sensitized solar cells. This is a comparison of the results obtained by the authors’ research team with literature data. The studies concern the effect of the chemical structure of the applied dye, TiO₂ nanostructure, co-adsorbents addition, and experimental conditions of the anode preparation. The oxide substrates were examined using a scanning electron microscope to determine the thickness and structure of the material. The TiO₂ substrates with anchored dye molecules were also tested for absorption properties in the UV-Vis light range, largely translating into current density values. Photovoltaic parameters of the fabricated devices with sandwich structure were obtained from current-voltage measurements. During tests conducted with the N719 dye, it was found that devices containing an 8.4 μm thick oxide semiconductor layer had the highest efficiency (5.99%). At the same time, studies were carried out to determine the effect of the solvent and it was found that the best results were obtained using an ACN : tert-butanol mixture (5.46%). Next, phenothiazine derivatives (PTZ-1–PTZ-6) were used to prepare the devices; among the prepared solar cells, the devices containing PTZ-2 and PTZ-3 had the highest performance (6.21 and 6.22%, respectively). Two compounds designated as Th-1 and M-1 were used to prepare devices containing a dye mixture with N719.

Application of gradient elution optimised by ChromSword software in chromatography of phenothiazines in reversed phase systems controlled by chaotropic effect

Flieger J., Markowski W.

Chemia Analityczna

2009

Vol. 54, No. 2

187-202

In this study, gradient and isocratic elution of 11 phenothiazine derivatives in the reversed--phase systems controlled by chaotropic effect was compared. Potential applicability of the Chromsword software for retention data prediction either under isocratic or gradient conditions was studied. Simulations were performed on the basis of previously conducted experiments concerning retention measurements at different concentrations of organic modifiers (methanol, acetonitrile) in the mobile phase. Eluent systems were acidified with perchloric acid and modified with chaotropic additives (sodium perchlorate and sodium hexafluorophosphate) at the constant concentration. An agreement between the predicted and experimental retention parameters was estimated statistically. Optimal gradient profile for the separation of all examined compounds was selected.

W pracy dokonano porównania elucji izokratycznej i gradientowej w odwróconym układzie faz kontrolowanych przez efekt chaotropowy w analizie 11 pochodnych fenotiazyny. Przeanalizowano możliwości oprogramowania Chromsword do przewidywania retencji zarówno w elucji izokratycznej jak i gradientowej. Symulację komputerową przeprowadzono w oparciu o wcześniejsze eksperymenty dotyczące pomiarów retencji przy różnych stężeniach organicznego modyfikatora (metanol, acetonitryl) w fazie ruchomej. Eluenty były zakwaszane kwasem chlorowym(VII) i modyfikowane dodatkiem soli chaotropowych (chloranu(VII) sodu i heksafluorofosforanu(V) sodu) o stałym stężeniu. Zgodność przewidywanych i eksperymentalnych parametrów retencji została oszacowana statystycznie. Wybrano optymalny profil gradientu dla badanej grupy związków.