Iranian Researchers Develop Carbon Nanotubes That Can Increase Solar Cells Efficiency

Sunday, December 1, 2019 - 10:46

Researchers from Azarbaijan Shahid Madani University have succeeded in developing the efficiency of solar cells beyond 17% via engineering the length and quality of grafts in organic halide perovskite/CNT photovoltaics.

According to an ISCA report, Renewable energy resources are virtually inexhaustible in duration but limited in the amount of energy that is available per unit of time.

In this regard, Samira Agbolaghi, faculty member of Azarbaijan Shahid Madani University Chemical Engineering Department, and her research team could develop a simple and inexpensive approach which could increase the efficiency of solar cells beyond 17%.

Based on the research, published in New Journal of Chemistry, “Pure carbon nanotubes (CNTs) and their derivatives grafted with the regiorandom poly (3-dodecyl thiophene) (CNT-g-PDDT) and regioregular poly(3-hexylthiophene) (CNT-g-P3HT) polymers were employed to improve the morphological, optical, and photovoltaic properties of CH3NH3PbI3 perovskite solar cells.

“Although the grafted CNT components improved the cell characteristics, bare CNTs destroyed them. The regioregularity and graft length influences were investigated on the system behavior. The CNT nanostructures grafted with the shorter P3HT backbones demonstrated the best results, i.e., 79.9 Ω, 23.60 mA cm−2, 76%, 0.97 V and 17.40%.

“This originated from the higher crystalline peak intensities for both P3HT (5.6–5.8°) and CH3NH3PbI3 (14.81, 20.91, 24.11, 29.21 and 32.51°) precursors and also the larger grain sizes (5 (600 nm) versus 50 (490 nm) kDa). The perovskite + CNT-g-P3HT devices, in particular the CNTs with shorter grafts, possessed faster electron transport and lower carrier recombination compared with the other solar cells, as evidenced by the larger short-circuit current density.”


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