# Spectral Analysis and Parameter Identification of Textile-Based Dye-Sensitized Solar Cells

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## Abstract

**:**

## 1. Introduction

## 2. Materials and Methods

#### 2.1. Measurements and Sprectral Analysis

#### 2.2. Parameter Identification

## 3. Spectral Analysis and Parameter Identification of the Linearized DSSC Model

#### 3.1. Spectral Analysis Versus Impedance Spectroscopy

#### 3.2. Spectral Analysis Using the Correlation Functions

#### 3.3. Parameter Identification Procedure

^{th}order TF, which can be decomposed into a product (or alternatively through partial fraction decomposition into a sum) of second-order TFs.

#### 3.4. Parameter Identification Example with Glass-Based DSSC

#### 3.5. Parameter Identification Examples with Half-Textile DSSC

_{2}-coated FTO (fluorine-doped thin oxide) glass plates (purchased from Man Solar) that were dyed with anthocyanins extracted from forest fruit tea (MAYFAIR). The counter electrodes were built on electrospun PAN nanofiber mat (prepared using the electrospinning machine “Nanospider Lab” (Elmarco, Czech Republic)) coated by one to five layers of PEDOT: PSS (CLEVIOS™ S V 4). As catalyst, a graphite layer performed by spraying was used (Graphit 33 by Kontakt Chemie). The both electrodes were put together and fixed by an adhesive tape, and the cells were filled with an iodine/triiodide based electrolyte (type 016 purchased from Man Solar). The detailed description of the cell preparation is given in [11].

## 4. Identification Results Summary

## 5. Discussion

## Author Contributions

## Funding

## Conflicts of Interest

## References

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**Figure 1.**Action-diagram of correlation analysis used during impedance spectroscopy for determination of the real and imaginary parts of the transfer function (TF) for the discrete angular frequency $\omega $.

**Figure 2.**Equivalent circuit used for the parametric identification of the impedance of standard glass dye-sensitized solar cells (DSSC), according to [2].

**Figure 3.**Comparison of the non-parametric and parametric TF identifications of a standard DSSC in Bode-diagram. Pole and zero values are given in (rad/s), resistance values in Ω and capacitances in F.

**Figure 4.**Comparison of the non-parametric and parametric TF identifications of a standard DSSC in Nyquist-diagram.

**Figure 5.**Comparison of the non-parametric and parametric TF identifications of a one-layer half-textile DSSC in Nyquist-diagram.

**Figure 6.**Proposed equivalent circuit for the parametric identification of the impedance of textile-based DSSC.

**Figure 7.**Comparison of the non-parametric and parametric TF identifications of a three-layer half-textile DSSC in Nyquist-diagram.

**Table 1.**Obtained parameters for half-textile DSSC cells with one to five layers of PEDOT: PSS in the counter electrode by spectral identification.

Cell Type | R^{1} (Ω) | R_{eq}^{2} (Ω) | L_{1}^{2} (mH) | R_{1}^{2} (Ω) | R_{3}^{2} (Ω) | C_{3}^{2} (µF) |
---|---|---|---|---|---|---|

Single layer | 575.91 | 755.53 | 0.112 | 16.95 | 213.65 | 84.83 |

Two layers | 528.58 | 529.60 | 0.410 | 0.081 | 22.83 | 447.99 |

Three layers | 279.14 | 288.14 | 0.050 | 10.72 | 20.59 | 161.31 |

Four layers | 130.47 | 165.70 | 0.007 | 3.963 | 36.76 | 71.451 |

Five layers | 242.43 | 253.66 | 0.016 | 6.744 | 17.13 | 144.27 |

^{1}From the pole-zero TF estimation.

^{2}From the equivalent-circuit TF estimation.

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**MDPI and ACS Style**

Juhász, L.; Juhász Junger, I.
Spectral Analysis and Parameter Identification of Textile-Based Dye-Sensitized Solar Cells. *Materials* **2018**, *11*, 1623.
https://doi.org/10.3390/ma11091623

**AMA Style**

Juhász L, Juhász Junger I.
Spectral Analysis and Parameter Identification of Textile-Based Dye-Sensitized Solar Cells. *Materials*. 2018; 11(9):1623.
https://doi.org/10.3390/ma11091623

**Chicago/Turabian Style**

Juhász, László, and Irén Juhász Junger.
2018. "Spectral Analysis and Parameter Identification of Textile-Based Dye-Sensitized Solar Cells" *Materials* 11, no. 9: 1623.
https://doi.org/10.3390/ma11091623