Efficient Liquid-Junction Monolithic Cobalt-Mediated Dye-Sensitized Solar Cells for Solar and Artificial Light Conversion

• Type: Article in International Scientific Journal
• Date: 2021-05-24

Authors

Fátima Santos (Author) FEUP; Carolina Hora (Author) Other; Dzmitry Ivanou (Author) FEUP; Adélio Mendes (Author) FEUP

Journal

Title: ACS Applied Energy Materials

Vol. 4 No. 5

Pages: 5050-5058

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 9 Citations

Scientific classification

CORDIS: Physical sciences > Chemistry

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: P-00V-10Q

DOI: 10.1021/acsaem.1c00616

Abstract (EN): Due to the extremely high power conversion efficiency under indoor light, aesthetic appeal, and safety, the mature technology of dye-sensitized solar cells (DSSCs) is now considered as one of the most budding technologies to address the fast-growing need for cordless power in countless IoT devices and wireless sensors. The monolithic design of DSSCs (M-DSSCs) is technologically attractive for commercial production offering straightforward processing in-series modules, low cost, and compactness. The advancements in liquid-junction M-DSSCs reported so far are related only to conventional Ru-dye and I-3(-)/I- electrolyte devices. The present study reports a M-DSSC incorporating a Co(III)/(II)(bpy)(3) redox shuttle and a YD2-o-C8 porphyrin dye and developed using commercial materials. The apparent activation energy for electron transfer, electron charge-transfer resistance, and exchange current density on FTO-Pt nanoparticles, Pt metal, graphite/carbon-black, and PEDOT:PSS in the cobalt electrolyte were determined to identify the favorable counter-electrode. The impact of the electrical spacer layers made from conventional ZrO2 and highly reflective rutile TiO2 on the photocurrent quantum yield was also assessed. The recombination-suppressing additive concentration in the electrolyte and photoanode sensitization conditions were thoroughly optimized to render M-DSSC devices with a photocurrent conversion efficiency of 9.5% under 1-sun illumination, which is by far the highest reported for M-DSSCs. The high power conversion efficiency of ca. 22% was attained under 1000 lx artificial light, making the developed M-DSSCs very attractive for indoor use.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9