Bifacial dye-sensitized solar cells utilizing green-colored NIR sensitive unsymmetrical squaraine dye

• Published in: Japanese Journal of Applied Physics Vol. 61; no. SB; p. SB1005
• Main Authors: Shaban, Suraya, Roy, Pritha, Vats, Ajendra Kumar, Pandey, Shyam S.
• Format: Journal Article
• Language: English
• Published: Tokyo IOP Publishing 01.02.2022; Japanese Journal of Applied Physics
• Subjects: Bifacial solar cells; Bifaciality factor; Dye-sensitized solar cells; Dyes; Electrolytes; Electrolytic cells; Electromagnetic absorption; Iodine; NIR dye; Photovoltaic cells; Quantum efficiency; Titanium dioxide; Transparent electrodes
• ISSN: 0021-4922; 1347-4065
• DOI: 10.35848/1347-4065/ac3570

Abstract Dye-sensitized solar cells (DSSCs) with the capability of photon harvesting from both front and rear sides, consisting of newly developed NIR dye (SQ-140), iodine-based redox electrolyte, and transparent counter electrode with high bifaciality factor (BFF) and good cumulated photoconversion efficiency (PCE), are successfully fabricated and characterized. The use of transparent TiO 2 -based photoanode leads to improved BFF as compared to its opaque TiO 2 counterparts: from 74% to 86% under similar experimental conditions and device parameters. The high molar extinction coefficient of the NIR dye SQ-140, needing a thinner TiO 2 layer, was found to be advantageous to maintaining the high BFF even in thicker TiO 2 films without serious compromise in the PCE. The lower efficiency of the bifacial DSSC under rear illumination was attributed to the hampered optical penetration as well as absorption of light by the intense colored iodine-based redox electrolyte.