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Effect of Structural Manipulation in Hetero-tri-aryl Amine Donor Based D-A’-π-A sensitizers in Dye Sensitized Solar Cells

Abstract

The role of hetero-atom manipulation/hetero aryl group insertion in the triarylamine to have hetero triarylamine as a donor in highly efficient photosensitizers is focused to investigate the structure-efficiency relationship in the dye sensitized solar cell (DSSCs). Newly synthesized sensitizer contains N-phenyl-N-(pyridin-2-yl) pyridine-2-amine (DPPA) and N-(pyridin-2-yl)-N-(thiophen-2-yl) pyridine-2-amine (DPTA) as donor along with strong electron withdrawing cyano group (–CN) as auxiliary acceptor group while cyanoacetic acid and rhodamine-3-acetic acid are explored as anchoring groups. Triphenylamine donor is manipulated first time with insertion of nitrogen atom in aryl ring for DSSCs. These hetero aryls based sensitizer reflects significant improvement in photophysical as well as photovoltaic performance. The replacement of cyanoacetic acid by rhodanine-3-acetic acid as an anchoring unit results in a significant red shift in absorption and emission maxima. The methylene group in rhodanine-3-acetic acid interrupts the LUMO delocalization on anchoring group in sensitizers DP3 and DP4, as shown by DFT calculations. The presence of cyanoacetic acid in sensitizers DP1 and DP2 shows effective charge transfer from HOMO to LUMO and efficient electron injection from LUMO to the conduction band of the TiO2 semiconductor. The sensitizer DP2 shows a maximum efficiency of 4.7%, short circuit current Jsc=11.78 mA.cm-2, open circuit voltage Voc=0.608 V and fill factor FF=0.62. The enhanced efficiency of sensitizer DP2 has been attributed to the presence of strong electron withdrawing cyanoacetic acid anchoring group & presence of thiophene linker at N-aryl core.

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Publication details

The article was received on 26 Nov 2017, accepted on 02 Feb 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04620K
Citation: New J. Chem., 2018, Accepted Manuscript
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    Effect of Structural Manipulation in Hetero-tri-aryl Amine Donor Based D-A’-π-A sensitizers in Dye Sensitized Solar Cells

    N. Sekar, D. Patil, K. K. Sonigara, M. M. Jadhav, K. Avhad, S. Sharma and S. S. Soni, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04620K

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