Influence of the concentration of chenodeoxycholic acid on the performance of the N719 dye

The influence of the Chenodeoxycholic acid (CDCA) at different concentrations on the spectroscopic and photovoltaic performances of the N719 dye was determined. Absorption analyses revealed the excellent capacity of the CDCA in stabilizing the N719 dye. The N719 dye exhibited hydroxyl and carboxylic functional groups that were accountable for the strong interactions and fast transport of electrons to the TiO2 surface. The photoluminescence emission spectroscopy of the CDCA-incorporated dye exhibited the feasibility of a large photocurrent generation. The interaction mechanism of CDCA within the N719 dye influenced the efficiency of the fabricated cell because the high photoconversion efficiency of 4.07% was recorded for 0 mM CDCA. This finding was because CDCA decreased the electrolyte contact with the N719 dye, resulting in charge accumulation in the electrolyte and decreased electron density in the N719 dye. Present findings are beneficial for the development of efficient dye-based DSSCs

Effect of chenodeoxycholic acid on the performance of dye-sensitized solar cells utilizing pinang palm (Areca catechu) dye

This study examined and described the optical and photovoltaic (PV) characterizations of the Fruit Areca catechu (pinang) as a new type of organic sensitizer. Recent reports stated that including chenodeoxycholic acid (CDCA) in the dye improves the performance of dye-sensitized solar cells (DSSCs). The effectiveness of PV dye was investigated by applying it in a DSSC. The absorption spectra indicated that natural dyes with CDCA has an excellent stabilizing ability. The Fourier-transform infrared spectra indicated the existence of carboxylic and hydroxyl functional groups in the naturally extracted dye. These functional groups were responsible for the rapid electron transfer and strong electronic linkages of interactions within the TiO2 surface. In this study, photoluminescence spectra analysis showed that by narrowing the bandgap, incorporating CDCA as a co-adsorbent in natural dye could generate a significant photocurrent. The overall power conversion efficiency was enhanced by 4.6%. Moreover, the cell efficiency reached up to 0.076% after adding 1.5 mM of CDCA without optimizing the sensitization time. Results demonstrated that the present study contributes toward the improvement of DSSC through efficient electron injection

Mechanism of Chemical Bath Deposition of CdS Thin Films: Influence of Sulphur Precursor Concentration on Microstructural and Optoelectronic Characterizations

In this study, we aimed to improve our understanding of the response mechanisms associated with the formation of CdS thin films. CdS thin film remains the most valuable option for many researchers, since it has shown to be an effective buffer material for film-based polycrystalline solar cells (CdTe, CIGSe, CZTS). We performed experimental and numerical simulations to investigate the effect of different thiourea concentrations on the characteristics of the CdS buffer layer. The experimental results reveal that an increase in thiourea concentrations had a direct effect on the optical results, with bandgap values ranging from (2.32 to 2.43) eV. XRD analysis confirmed that all deposited films were polycrystalline, except for [1/0.75], where there is no CdS formation. Electrical studies indicated that CdS with a molar ratio of [Cd]/[S] of 1 had the maximum carrier concentration (3.21 × 1014 cm−3) and lowest resistivity (1843.9 Ω·cm). Based on the proposed mechanism, three kinds of mechanisms are involved in the formation of CdS layers. Among them, the ion-by-ion mechanism has a significant effect on the formation of CdS films. Besides, modelling studies reveal that the optic-electrical properties of the buffer layer play a crucial role in influencing the performance of a CIGS solar cell