Photovoltaic Effects of Dye-Sensitized Solar Cells Using Double-Layered TiO₂ Photoelectrodes and Pyrazine-Based Photosensitizers.

Content Provider	Europe PMC
Author	Kim, Mi-Ra Pham, Thanh Chung Yang, Hyun-Seock Park, Sung Heum Yang, Seah Park, Myeongkee Lee, Sang Gil Lee, Songyi
Copyright Year	2023
Abstract	In this study, to obtain high performances of the dye-sensitizedsolar cells using the optimal TiO2 photoelectrode for thesynthesized pyrazine-based organic photosensitizers, three types ofTiO2 photoelectrodes were fabricated and evaluated forcomparison. The double-layered nanoporous TiO2 photoelectrode(SPD type) consisted of a dispersed TiO2 layer and a transparentTiO2 layer. The single-layered nanoporous TiO2 photoelectrodes (D type and SP type) consisted of a dispersed TiO2 layer and a transparent TiO2 layer, respectively.The surface area, pore volume, and crystalline structures of the threetypes of TiO2 photoelectrodes were analyzed by Brunauer–Emmett–Tellermethod, field-emission scanning electron microscopy, and X-ray diffractometryto confirm their crystallinity and surface morphology. The structuresof the three types of TiO2 photoelectrode-adsorbed organicsensitizers were investigated using X-ray photoelectron spectroscopy.The photovoltaic performances of DSSC devices using three organicphotosensitizers adsorbed onto the three types of TiO2 photoelectrodeswere investigated under a light intensity of 100 mW/cm2 at AM 1.5. The DSSC device using double-layered SPD type TiO2 photoelectrodes displayed 1.31∼2.64% efficiency, comparedto single-layered SP type TiO2 photoelectrodes (1.31∼2.50%)and D type TiO2 photoelectrodes (0.90∼1.54%), usingorganic photosensitizers. The DSSC device using the SPD type TiO2 photoelectrode and trifluoromethylbenzopyrazine (TPPF) asa photosensitizer showed the highest performances: Jsc of 5.69 mA/cm2, Voc of 0.69 V, FF of 0.67, and efficiency of 2.64%.The relationship between photovoltaic effects and interfacial resistancecharacteristics of DSSCs using the three organic photosensitizersadsorbed onto the three types of TiO2 photoelectrodes couldbe interpreted from interfacial resistances according to frequencythrough impedance analysis.
Journal	ACS Omega
Volume Number	8
PubMed Central reference number	PMC10134224
Issue Number	16
PubMed reference number	37125135
e-ISSN	24701343
DOI	10.1021/acsomega.3c00707
Language	English
Publisher	American Chemical Society
Publisher Date	2023-04-12
Access Restriction	Open
Rights License	Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). © 2023 The Authors. Published by American Chemical Society
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering