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研究生：	阮香茶嵋 Nguyen, Huong Tra My
論文名稱：	高分子固態電解質的製備及其在全固態染料敏化太陽能電池的應用 Fabrication of polymer solid-state electrolyte for all-solid-state dye-sensitized solar cell applications
指導教授：	李玉郎 Lee, Yuh-Lang
學位類別：	碩士 Master
系所名稱：	工學院 - 化學工程學系 Department of Chemical Engineering
論文出版年：	2022
畢業學年度：	110
語文別：	英文
論文頁數：	108
外文關鍵詞：	Dye-sensitized solar cells, nano-fillers, solvent-free electrolyte, polymeric solid-state electrolyte, film electrolyte
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In this study, polyethylene oxide (PEO) (400 000 g/mol) and polyethylene glycol (PEG) (400 g/mol) are utilized to prepare polymeric solid-state electrolyte containing I-/I3- redox couple, and employed to fabricate all-solid-state dye-sensitized solar cells (s-DSSC). First of all, a gel-state electrolyte was prepared by introducing PEO and PEG into an ACN liquid electrolyte. Two methods were used to fabricate solid-state cells. The first one is printing the gel-electrolyte directly on a TiO2 photo-electrode, followed by covering a counter electrode and evaporating the ACN solvent in a vacuum chamber. After sealing the cell, a solid-state DSSC was fabricated. For the second method, a solid-state electrolyte film was prepared first by printing the gel-electrolyte on a glass substrate and evaporating the solvent. The films were stripped off from the glass surface and then, sandwiched between photo-electrode and counter electrode by hot pressing. The spectrum of Fourier-transform infrared spectroscopy didn’t show the ACN peak, confirming the formation of solid-state electrolytes. By regulation the concentration of PEO/PEG, as well as utilization of TiO2 nanofillers, the highest power conversion efficiencies of the solid-state DSSC measured under one sun illumination is 8.07% by the first method (in-situ solidification), and 8.13 % by using the solid-state film electrolytes. These solid-state DSSCs can retain 94% of their initial value after one month test in room temperature.

ABSTRACT		I
EXTENDED ABSTRACT	II
ACKNOWLEDGMENT	XVI
TABLE OF CONTENTS	XVIII
LIST OF FIGURES	XXI
LIST OF TABLES	XXIV
CHAPTER 1.	INTRODUCTION	1
1.	Background and motivation	1
2.	Objectives	2
3.	Outline	4
CHAPTER 2.	LITERATURE REVIEW AND SUMMARY	5
1.	Photovoltaic development’s milestones	5
2.	Structure and general operational working function of DSSC	6
2.1.	Structure	6
2.2.	General operational working function	7
3.	Device composition	9
3.1.	Substrates – Conductive glasses	9
3.2.	Nano-crystalline semiconductors	10
3.3.	Photosensitizers – Dyes	13
3.4.	Electrolytes	20
3.5.	Counter electrodes	27
4.	DSSCs characteristics	28
4.1.	Solar spectrum characteristics	28
4.2.	Current-voltage characteristics	30
4.3.	Electrochemical Impedance Spectroscopy	32
4.4.	Spectral responsively of DSSC	35
CHAPTER 3.	EXPERIMENTAL	37
1.	Chemicals and materials	37
1.1.	Anode – Photoelectrode	37
1.2.	Solvents and cleaners	38
1.3.	Electrolyte components	38
1.4.	Counter Electrode Components	38
1.5.	Cell assembly components	39
2.	Apparatus	39
2.1.	Ultrasonic cleaner	39
2.2.	Screen printer	40
2.3.	Hot plate	40
2.4.	High temperature furnace	41
2.5.	Hole driller	42
2.6.	Sputter coater	42
2.7.	Vacuum drying oven	43
2.8.	Spin coater	44
3.	Instrument	44
3.1.	Alpha-step	44
3.2.	Solar simulator	45
3.3.	Electrochemical Analyzer	46
3.4.	Incident photon-to-current efficiency	47
3.5.	Thermal gravimetric analyzer	49
4.	Experimental procedures	49
4.1.	Fluorine-doped tin oxide glass cleaning procedure	49
4.2.	Photo-electrode fabrication	50
4.3.	Counter electrode preparation	50
4.4.	Electrolyte fabrication	51
4.5.	Cell assembling	51
5.	Characterization	55
5.1.	J-V Curve Measurement	55
5.2.	Electrochemical Impedance Spectroscopy Analysis	55
CHAPTER 4.	RESULTS & DISCUSSION	57
1.	In-situ solidification method	58
1.1.	Define weight percent of poly (ethylene oxide)	58
1.2.	Define the electron transfer path	60
1.3.	Optimize the solvent evaporation condition	63
1.4.	Adjust the ratios of poly (ethylene oxide)/poly (ethylene glycol) as blended viscous agents in printable electrolyte	65
1.5.	Thermogravimetric analysis of peeled film from photoanode	68
6.1. Effect of nano-fillers as addictive in electrolytes	70
2.	Film electrolyte method	76
2.1.	The excess solvent in film electrolyte	76
2.2.	Effect of re-melting film condition	79
2.3.	Effect of the photoanode main layers structure	83
2.4.	Pre-coating electrolyte	90
2.5.	Nano-fillers as addictive in film electrolyte	95
3.	Stability	97
CHAPTER 5.	CONCLUSIONS AND RECOMMENDATIONS	99
1.	Conclusions	99
2.	Recommendations	99
2.1.	NFs addition in pre-coating electrolyte	100
2.2.	Modifying electrolytes by using TiO2 NFs.	100
REFERENCES		101
APPENDIX		108
                                    

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