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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.

The Effect of Electrode Immersion Time and Ageing on N719 Dye-Sensitized Solar Cells Performance

Krawczak Ewelina, Zdyb Agata

Journal of Ecological Engineering

2020

Vol. 21, nr 6

53--60

One of the most promising devices belonging to the third generation of photovoltaic technologies is dye-sensitized solar cell (DSSC). It can be considered as an economic substitute for the first and second generation of solar cells which provides relatively high conversion efficiency at low cost of material and simple manufacturing. This technology is widely developed nowadays thus it can contribute the meeting of the current and future energy demands. However, much work should be done to increase solar-electricity conversion efficiency of DSSC. It is identified that a crucial component which strongly affects the performance of the working dye-sensitized cell is dye sensitizer used to enhance the light harvesting. The adjustment of the amount of the adsorbed dye by a modification of photoelectrode immersion time in dye solution plays a crucial role. The objective of this study was to report the influence of electrode immersion time on dye-sensitized solar cells performance and to evaluate the stability of obtained cells. DSSC assemblies were prepared in the sandwich way with the working area equal to 0.8 cm2. The impact of various immersion times in N719 dye solution of the TiO2 covered photoelectrodes have been investigated. In the study, the process of encapsulation of the cells with sealant gaskets was enhanced which caused the improvement of the stability and tightness of the obtained DSSC devices. The methodological process adopted in this investigation includes measurements of current-voltage (I-V) characteristics performed right after cell preparation, and after 72 hours to evaluate the role of ageing. The characterization of the obtained solar cells was carried out under standard test conditions (STC; temperature 25°C, irradiance 100 mW/cm2, air mass AM 1.5). On the basis of I-V curves measurements, characteristic operating parameters of the obtained DSSC assemblies such as open circuit voltage (VOC), short circuit current (ISC), and maximum power point (MPP) have been established. The results of this research indicate that the time of electrode immersion in the dye solution affects strongly the DSSC performance. Thus, the control of the stage of the dye adsorption by the TiO2 layer is vitally important.