Efficient and Stable Fiber Dye-Sensitized Solar Cells Based on Solid-State Li-TFSI Electrolytes with 4-Oxo-TEMPO Derivatives

Fiber-shaped dye-sensitized solar cells (FDSSCs) with flexibility, weavablity, and wearability have attracted intense scientific interest and development in recent years due to their low cost, simple fabrication, and environmentally friendly operation. Since the Grätzel group used the organic radica...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-07, Vol.12 (13), p.2309
Main Authors: An, Pyeongje, Kim, Jae Ho, Shin, Myeonghwan, Kim, Sukyeong, Cho, Sungok, Park, Chaehyun, Kim, Geonguk, Lee, Hyung Woo, Choi, Jin Woo, Ahn, Chuljin, Song, Myungkwan
Format: Article
Language:English
Subjects:
Catalysts
Chloride
Circuits
Cold
Communication
Dye-sensitized solar cells
Dyes
Efficiency
Electrodes
Electrolytes
Electrolytic cells
Energy conversion efficiency
Fabrication
fiber-shaped solar cells
Hydrochloric acid
Iodine
Lithium
Molten salt electrolytes
Oxidants
Oxidizing agents
Photovoltaic cells
Quantum dots
Recombination
Short circuit currents
Short-circuit current
Shunt resistance
Solar cells
Solar energy
Solid electrolytes
Solid state
solid-state Li-TFSI electrolyte
Spectrum analysis
Structural stability
TEMPO derivatives
Textiles
Titanium
Wire
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Summary:Fiber-shaped dye-sensitized solar cells (FDSSCs) with flexibility, weavablity, and wearability have attracted intense scientific interest and development in recent years due to their low cost, simple fabrication, and environmentally friendly operation. Since the Grätzel group used the organic radical 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) as the redox system in dye-sensitized solar cells (DSSCs) in 2008, TEMPO has been utilized as an electrolyte to further improve power conversion efficiency (PCE) of solar cells. Hence, the TEMPO with high catalyst oxidant characteristics was developed as a hybrid solid-state electrolyte having high conductivity and stability structure by being integrated with a lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) film for FDSSCs. The optimized 4-Oxo TEMPO (OX) based solid-state FDSSC (SS-FDSSC) showed the PCE of up to 6%, which was improved by 34.2% compared to that of the reference device with 4.47%. The OX-enhanced SS-FDSSCs reduced a series resistance (Rs) resulting in effective electron extraction with improved short-circuit current density (JSC), while increasing a shunt resistance (Rsh) to prevent the recombination of photo-excited electrons. The result is an improvement in a fill factor (FF) and consequently a higher value for the PCE.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12132309