Abstract
Objective: The objective of this study was to assess the influence of encapsulation of cis-bis(isothiocyanato)(2,2\'-bipyridyl-4,4\'-dicarboxylato)(4,4\'-di-nonyl-2\'- bipyridyl) ruthenium(II) (Z907 dye) to macrocycle cucurbit[7]uril (CB7) (host) on the performance of nanocrystalline titanium dioxide (nc-TiO2)/ poly3-hexylthiophene (P3HT) heterojunction solar cell. Method: Two solar cells composed of five layers with and without the encapsulation of Z907 dye on the top of TiO2 film were used. The admittance spectroscopy was measured at different frequencies to confirm the modification of the interfacial layers\' properties in solar cells. Findings: The results demonstrated different capacitance responses depending on the voltage applied to the devices. The encapsulated device had a higher capacitance response to forward bias and reverse bias than the non-encapsulated device at the same frequency. The negative capacitance of the two devices was also observed. The results were attributed to an increase in the accumulation of charge carriers and the formation of electric dipoles at the junction which rapidly decreased the capacitance to negative values. Application: This study demonstrated that using encapsulation of dye improved the solar cells\' maximum electric power to 0.14mW/cm2 , while it was 0.04 mW/cm2 in the non-encapsulated solar cells. Keywords: Solar cells; Junction capacitance; X-ray diffraction; SEM micrograph; Geometric capacitance
Highlights
The efficiency of dye-sensitised solar cells (DSSCs) depends on parameter such as the band gap, molecular structure, morphology, and thickness of the components [1,2,3,4]
In the previous studies [3], the best solar cell performance was achieved in films with the highest RMS roughness and a columnar morphology, the highest external quantum efficiencies (EQEs), and open circuit voltage compared with smoother nc-TiO2 films
We demonstrated that the encapsulation of Z907 dye inside macrocycle cucurbit[7]uril (CB7) can modify the interfacial properties of DSSCs
Summary
The efficiency of dye-sensitised solar cells (DSSCs) depends on parameter such as the band gap, molecular structure, morphology, and thickness of the components (hole transport layer, dyes, and oxide materials) [1,2,3,4]. DSSCs can be challenging to fabricate, The formation of closely packed dye aggregates via intermolecular interactions on the surface can minimise the interfacial charge recombination dynamics at the junction between the polymer and dye layer [7,8]. To overcome these challenges, many studies have been conducted to avoid dye aggregation in DSSCs. Seigoito [9] reported that ruthenium. Water in the dye solution significantly decreases surface dye aggregation, improving solar cell performance of N719 [10].
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