In situ image processing method to investigate performance and stability of dye solar cells

Asghar, Muhammad Imran; Miettunen, Kati; Mastroianni, Simone; Halme, Janne; Vahlman, Henri; Lund, Peter

doi:10.1016/j.solener.2011.10.006

Cited by 51 publications

(87 citation statements)

References 16 publications

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“…Then the slope of the bleaching would still be the same but the starting point would be higher. This is also suggested by Mastroianni et al 15 The experimental confirmation of this question was not within the scope of this study, but a comparison was performed that was based on the aging data presented by Asghar et al 24 (the blue lines in Fig. 9).…”

Section: (Ncs)(h 2 O)] [Rul 2 (Ncs)(mpn)] [Rul 2 (Ncs)(nmbi)] [Rulsupporting

confidence: 65%

“…24 Cell photographing is also suitable for monitoring dye desorption to the electrolyte because desorption increases the red RGB pixel values of the photographs of the electrolyte. 24 A detailed description of the photographing method and the photographing system can be found in the literature. 24 Fourth, the post-aging tests were performed after an aging period of 1000 hours.…”

Section: H662mentioning

confidence: 99%

“…24 A detailed description of the photographing method and the photographing system can be found in the literature. 24 Fourth, the post-aging tests were performed after an aging period of 1000 hours. These tests were otherwise the same as the pre-aging tests but one more test was added: liquid chromatography-mass spectrometry (LC-MS) measurements for a couple of cells in each cell group.…”

Section: H662mentioning

confidence: 99%

“…These subjects are studied further in this section by estimating the evolution of the iodine concentration in the electrolyte in the cells of this study and comparing them to another study. 24 The cell photographing results were used for estimating the iodine concentration as a function of the cumulative UV dose shown in Fig. 9.…”

Section: (Ncs)(h 2 O)] [Rul 2 (Ncs)(mpn)] [Rul 2 (Ncs)(nmbi)] [Rulmentioning

confidence: 99%

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The Effect of Electrolyte Purification on the Performance and Long-Term Stability of Dye-Sensitized Solar Cells

Tiihonen

Miettunen

Rendon

et al. 2015

J. Electrochem. Soc.

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In this study the effect of the purification of electrolyte material on the performance and long-term stability of dye-sensitized solar cells is investigated. The combined effect of purifying all the electrolyte materials has been examined, as has the effect of purifying each compound to identify those compounds worth purifying and to eliminate unnecessary production steps on an industrial scale. Statistical methods were employed to draw statistically significant conclusions from the experimental results. No effect on the initial cell performance is found in this study. The purity of the electrolyte solvent (here methoxypropionitrile) is shown to have a remarkable effect on the cell lifetime: it could even double when the cell is properly purified. It is shown that exposing the cell to even relatively small amounts of UV light resulted in cell degradation through electrolyte bleaching during a 1000 hour aging test. Here the impurities in the electrolyte solvent lead to an almost doubled rate of electrolyte bleaching under UV light. Dye-sensitized solar cells (DSSC) have the potential to become a low-cost alternative to silicon solar cells in the future. They can be made out of sustainable materials, they have a wide application area, and they are on the threshold of large-scale production.1 They are also efficient: an 11.9% efficiency record for DSSCs has been achieved.2 At the moment one of the main challenges is the cell stability. DSSC stability for approximately 20 years in outdoor conditions is an essential prerequisite for the introduction of DSSCs into the wide commercial market, e.g., in the form of building-integrated panels. The structure of DSSCs is quite complicated and unfortunately the components tend to age when the DSSC is exposed long-term to light, humidity, and extreme temperatures. 3,1,4,5,6,7,8 Material purification has been proposed to increase the stability of the cells.9-12 The use of highly pure materials is also regarded as an essential step in the preparation of most efficient cells. 13,10,14 The reported data do not, however, include direct comparisons of purified and unpurified materials, which would be essential for assessing the importance of material purification in cell fabrication. From the industrial point of view, material purification increases the production costs of the cells. Thus the necessity of material purification should be studied carefully, 1,15 just like any step that increases the complexity of the production. The objective of this study is to investigate if cell efficiency and stability increase as a result of the purification of the electrolyte material. The effect of the purification of all the electrolyte materials has been studied and the effect of each compound has been statistically compared and analyzed. The research continues in, 16 where the effect of dye purification on cell efficiency and lifetime is studied.It is still quite common in the field to utilize only a few tests, mainly IV curve measurements in aging studies, or to test the cells only at the...

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Section: (Ncs)(h 2 O)] [Rul 2 (Ncs)(mpn)] [Rul 2 (Ncs)(nmbi)] [Rulsupporting

confidence: 65%

Section: H662mentioning

confidence: 99%

Section: H662mentioning

confidence: 99%

Section: (Ncs)(h 2 O)] [Rul 2 (Ncs)(mpn)] [Rul 2 (Ncs)(nmbi)] [Rulmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Electrolyte Purification on the Performance and Long-Term Stability of Dye-Sensitized Solar Cells

Tiihonen

Miettunen

Rendon

et al. 2015

J. Electrochem. Soc.

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“…When sensitized, these reactions are still occurring but at slower rate. This was similarly experienced in the case of iodine consumption for which Asghar et al have made careful comparison between unsensitized TiO 2 and sensitized TiO 2 highlighting that dye monolayer only slows down this reaction [161]. MPN-based electrolyte stability is strongly affected by the surface of TiO 2 which tends to destabilize significantly the thermal stability of electrolyte components by about 50 ∘ C (Figure 12).…”

mentioning

confidence: 76%

A Review on Current Status of Stability and Knowledge on Liquid Electrolyte-Based Dye-Sensitized Solar Cells

Sauvage

2014

Advances in Chemistry

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The purpose of this review is to gather the current background in materials development and provide the reader with an accurate image of today's knowledge regarding the stability of dye-sensitized solar cells. This contribution highlights the literature from the 1970s to the present day on nanostructured TiO 2 , dye, Pt counter electrode, and liquid electrolyte for which this review is focused on.

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Stability Assessment Strategy for Counter Electrode Catalysts of Dye‐Sensitized Solar Cells

Yun

Lund

2018

Counter Electrodes for Dye‐sensitized and Perovskite Solar Cells

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In situ image processing method to investigate performance and stability of dye solar cells

Cited by 51 publications

References 16 publications

The Effect of Electrolyte Purification on the Performance and Long-Term Stability of Dye-Sensitized Solar Cells

The Effect of Electrolyte Purification on the Performance and Long-Term Stability of Dye-Sensitized Solar Cells

A Review on Current Status of Stability and Knowledge on Liquid Electrolyte-Based Dye-Sensitized Solar Cells

Stability Assessment Strategy for Counter Electrode Catalysts of Dye‐Sensitized Solar Cells

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