Electrochemical methods for the characterization and interfacial study of dye-sensitized solar cell

Zheng, Dajiang; Ye, Meidan; Wen, Xiaoru; Zhang, Nan; Lin, Changjian

doi:10.1007/s11434-015-0769-0

Cited by 28 publications

(12 citation statements)

References 121 publications

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“…The lower R ct means a higher charge transfer rate at the Pt electrode/electrolyte interface . PMF‐sensitized DSSC exhibits the lowest R ct values of 2 kΩ, followed by RTF and JFL with 2.16 kΩ and 2.86 kΩ, respectively.…”

Section: Resultsmentioning

confidence: 99%

St. Lucie cherry, yellow jasmine, and madder berries as novel natural sensitizers for dye‐sensitized solar cells

et al. 2019

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Summary Natural dyes extracted from fruits, vegetables, flowers, and leaves are considered as promising alternative sensitizers to replace synthetic dyes for dye‐sensitized solar cells (DSSCs). Generally, solar activity of natural dyes stem from anthocyanin pigment. Carbonyl, carboxyl, and hydroxyl groups present in the anthocyanin molecule improve the adsorption ability of dye on TiO2 and therefore facilitate charge transfer. Here, for the first time, novel natural dyes extracted from St. Lucie cherry, yellow jasmine, and madder berries are reported to act as sensitizer in DSSCs. These novel natural dye extracts are prepared by dissolving related fruits in ethanol. The ingredient of the dyes is identified by FT‐IR spectroscopy. Accordingly, FT‐IR spectrum reveals that novel natural dye extracts exhibit all the characteristic peaks of anthocyanin pigment. Specifically, St. Lucie cherry consists of more distinct carbonyl group than other sources. Also, photoanodes composed of three TiO2 layers are prepared by using a spin‐coating method. Then, they are immersed into natural dyes and analyzed by conducting UV‐Vis spectroscopy. Compared with bare TiO2, natural dye–loaded photoanodes demonstrate far higher absorption ability in the visible region. After fabrication of devices with different novel natural dye sensitizers, current‐voltage characteristics and electrochemical impedance spectroscopy measurements are performed. The best power conversion efficiency (PCE) of 0.19% is obtained by sensitization of St. Lucie cherry with an open‐circuit voltage (Voc) of 0.56 V, short‐circuit current density (Jsc) of 181 μA cm−2, and fill factor (FF) of 0.55. Furthermore, St. Lucie cherry–sensitized devices show the lowest charge transfer and highest recombination resistances. This result can be attributed to the obvious carbonyl group exhibited by St. Lucie cherry.

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Section: Resultsmentioning

confidence: 99%

St. Lucie cherry, yellow jasmine, and madder berries as novel natural sensitizers for dye‐sensitized solar cells

et al. 2019

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“…The current-voltage (I-V) characteristic curve is the relationship between the output current and voltage of the solar cell under standard full spectrum irradiation, and is used to determine the photovoltaic parameters of the device. 10,68,136 In the I-V curve (Fig. 9), the open circuit voltage (V OC ) and short circuit current (I SC ) or short circuit current density ( J SC ) are the intercepts of the J-V curve in the lateral and vertical axes, respectively.…”

Section: Characterization Of Counter Electrodesmentioning

confidence: 99%

“…By comparing the frequency response of the input signal and the output signal amplitude and phase, and fitting relative data from IMPS and IMVS, the electron diffusion coefficient (D n ), electron life time (t n ), absorption coefficient (a) and important information can be obtained, which provide useful tools to study the electron transport mechanism and charge transfer kinetics in DSSCs. 136,[156][157][158][159][160][161][162] Under short circuit conditions, the photocurrent response is measured at different frequencies in IMPS and the electron transport time (t d ) can be expressed as…”

Section: Characterization Of Counter Electrodesmentioning

confidence: 99%

Counter electrodes in dye-sensitized solar cells

et al. 2017

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Dye-sensitized solar cells (DSSCs) are regarded as prospective solar cells for the next generation of photovoltaic technologies and have become research hotspots in the PV field. The counter electrode, as a crucial component of DSSCs, collects electrons from the external circuit and catalyzes the redox reduction in the electrolyte, which has a significant influence on the photovoltaic performance, long-term stability and cost of the devices. Solar cells, dye-sensitized solar cells, as well as the structure, principle, preparation and characterization of counter electrodes are mentioned in the introduction section. The next six sections discuss the counter electrodes based on transparency and flexibility, metals and alloys, carbon materials, conductive polymers, transition metal compounds, and hybrids, respectively. The special features and performance, advantages and disadvantages, preparation, characterization, mechanisms, important events and development histories of various counter electrodes are presented. In the eighth section, the development of counter electrodes is summarized with an outlook. This article panoramically reviews the counter electrodes in DSSCs, which is of great significance for enhancing the development levels of DSSCs and other photoelectrochemical devices.

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“…The EIS of the solar cells was measured over a frequency range of 100 kHz-10 mHz at ambient conditions by a Biologic electrochemical workstation, with a constant DC voltage bias of 0.5 V (close to the open circuit voltage of the DSSC). Several research groups have already demonstrated a systematic approach to characterize EIS of DSSCs [37][38][39][40].…”

Section: Characterization and Measurementsmentioning

confidence: 99%

Co-sensitization aided efficiency enhancement in betanin–chlorophyll solar cell

Pesala

2018

Mater Renew Sustain Energy

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Dye-sensitized solar cells (DSSCs) are a promising third-generation photovoltaic cell technology whose advantages are low-cost fabrication, reduced energy payback time, better performance under diffuse light conditions and flexibility. Typically DSSCs employ toxic dyes such as metal-based porphyrins requiring complex synthesis. In contrast, natural pigments are environmentally and economically superior to synthetic dyes. However, narrow absorption spectra of natural pigments result in low efficiencies of the solar cells. Hence, co-sensitizing pigments with complementary absorption spectra, which increases the absorption band, is an attractive pathway to enhance the efficiency. In this paper, we report the performance of betanin-chlorophyll co-sensitized solar cell using betanin (λ max = 535 nm) and chlorophyll-a (λ max = 435 nm, 668 nm), natural pigments having complementary absorption spectra. Density functional theory simulations were performed to verify that the lowest unoccupied molecular orbital and the highest occupied molecular orbital levels of the dye molecules, are aligned appropriately with that of TiO 2 and the redox electrolyte, respectively, which is necessary for optimal device performance. Electrochemical impedance spectroscopic studies were performed to determine parameters corresponding to the charge transfer processes in the dye solar cells. Individual and co-sensitized solar cells were fabricated and the co-sensitized solar cell demonstrated a higher efficiency of 0.601% compared to efficiencies of 0.562% and 0.047% shown by betanin and chlorophyll solar cells, respectively.

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Electrochemical methods for the characterization and interfacial study of dye-sensitized solar cell

Cited by 28 publications

References 121 publications

St. Lucie cherry, yellow jasmine, and madder berries as novel natural sensitizers for dye‐sensitized solar cells

St. Lucie cherry, yellow jasmine, and madder berries as novel natural sensitizers for dye‐sensitized solar cells

Counter electrodes in dye-sensitized solar cells

Co-sensitization aided efficiency enhancement in betanin–chlorophyll solar cell

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