Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
This work presents the synthesis and characterization of FeS2 and polythiophene derivates and the low-cost fabrication of their corresponding hybrid solar cells. FeS2 nanoparticles were prepared by microwave method using tri-sodium citrate and sodium tartrate as complexing agents to study their effect on the optical properties and stability for 21 days without special storage conditions. FeS2 nanoparticles showed absorption in the visible range with a single-phase of cubic pyrite and crystallite size around 17.5 +/- 2.92 nm. Moreover, nanoparticles showed a low photoluminescence intensity. FE-SEM images showed a spherical shape and size distribution of 15-30 nm depending on the complexing agent. The use of complexing agents modifies the size and shape of FeS2 nanoparticles influencing the tuning of absorption and emission spectra over time. Polythiophene and poly 3-hexylthiophene were compared to a series of thiophene-based polymers prepared by aldol condensation of ketones ( propanone, butanone, and hexanone) with 2,5-thiophenedicarboxaldehyde-derivates. It allows extra-conjugation between thiophene rings, and it influences the solubility of the materials. The obtained polymers have activity in the visible region with absorption from 600 to 350 nm, are thermostable below 300 ° C, and have a conductivity higher than 10-3 Scm-1, due to the delocalization of π electrons in the main chain. A series of bulk heterojunction hybrid polymer solar cells were made by blending FeS2 nanoparticles and a conjugated polymer into a thin film deposited by screen printing. The efficiency of these solar cells represents an improvement compared to existing hybrid solar cells based on FeS2 and polythiophene derivates.
This research (or network) received funding the PAICYT (UANL) IT1088-19 and IT1718-21
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