Lactuca sativa leaf extract concentration optimization using evolutionary strategy as photosensitizer for TiO2-filmed Grӓtzel cell

Authors

• Ronnie S. Concepcion II, De La Salle University, Manila
• Jonnel D. Alejandrino, De La Salle University, Manila
• Christan Hail R. Mendigoria, De La Salle University, Manila
• Elmer Jose P. Dadios, De La Salle University, Manila
• Argel A. Bandala, De La Salle University, Manila
• Edwin Sybingco, De La Salle University, Manila
• Ryan Rhay P. Vicerra, De La Salle University, Manila

College

Gokongwei College of Engineering

Department/Unit

Electronics And Communications Engg

Document Type

Article

Source Title

Optik - International Journal for Light and Electron Optics

Volume

242

Publication Date

2021

Abstract

To enhance the power efficiency of a dye-sensitized solar cell (DSSC) or Grӓtzel cell, photosensitizer concentration must be fine-adjusted within the ultraviolet and near-infrared spectrum. In this study, evolutionary computing through genetic algorithm (GA) and evolutionary strategy (ES) was employed to determine the optimal combination of chlorophyll a and anthocyanin concentrated dyes extracted from cultivated Lactuca sativa var. Altima (green) and Rania (violet). ES configured with 0.6 selection rate, 0.08 Gaussian mutation rate, and 0.4 crossover rate generated the optimal dye concentration of 16.5% green and 83.5% violet yielding 24.093% efficiency in AM 1.5 sunlight intensity. It also exhibited the maximum short-circuit current

(4.591 mA), open-circuit voltage (688.7 mV), filling factor (0.762), and power (3.162 mW). UV- Vis spectrophotometry confirmed that combining chlorophyll (663 nm) and anthocyanin (520

nm) pigments increases photon energy utilization. It is supported by the 2.39 eV optical energy bandgap and 2.009 Km− 1 absorption coefficient of the ES-based cell. FTIR verified that no new bond or reaction was formed by combining pigments rather they coexist with each other allowing a broader light spectrum to excite the ground state electrons in the TiO2 layer. Thus, ES-combined dyes increased the efficiency by a factor of 9.965 and 2.299 from green and violet pigments respectively.

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Recommended Citation

Concepcion, R. S., Alejandrino, J. D., Mendigoria, C. R., Dadios, E. P., Bandala, A. A., Sybingco, E., & Vicerra, R. P. (2021). Lactuca sativa leaf extract concentration optimization using evolutionary strategy as photosensitizer for TiO2-filmed Grӓtzel cell. Optik - International Journal for Light and Electron Optics, 242 Retrieved from https://animorepository.dlsu.edu.ph/faculty_research/15309

Disciplines

Electrical and Computer Engineering

Keywords

Photosensitizing compounds; Dye-sensitized solar cells; Lettuce; Fourier transform infrared spectroscopy

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