Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Truxene and its derivatives have been commonly studied in various energy conversion applications such as dye synthesized solar cells, organic light-emitting diodes, supercapacitors, and photovoltaics from its first reported synthesis in 1894. The structure of truexene core can be easily modified with variety of peripheral functionalization1. Pyridine is an analogue to benzene with one of the CH group substituted by an N atom. In perovskite crystals, the under-coordinated Pb ions would work as electron traps and elevate the possibility of the charge recombination due to the presence of positive charge defects2. Nitrogen atom of pyridine has lone electron pairs which due to passivate the under-coordinated Pb ions that can effectively promote the device performance3. 4,4',4''-(5,5,10,10,15,15-hexahexyl-10,15-dihydro-5H-diindeno[1,2-a:1',2'-c]fluorene-2,7,12-triyl)tris(3-fluoropyridine) (Trux-FPy) was synthesized and the structure was analyzed via 1H NMR, 13C NMR, mass spectrometry and elemental analysis. High occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels were calculated as 5.47 eV and 2.00 eV by using cyclic voltammetry, respectively. The optical properties of Trux-FPy were characterized via absorption and emission spectroscopy. Photovoltaic performance was examined under standard AM 1.5 illumination (100mW.cm-2).
1- C. Huang, W. Fu, C. Z. Li, Z. Zhang, W. Qiu, M. Shi, P. Heremans, A. K. Y. Jen, H. Chen. J. Am. Chem. Soc. 2016, 138, 2528−2531.
2- N. K. Noel, A. Abate, S. D. Stranks, E. S. Parrott, V. M. Burlakov, A. Goriely and H. J. Snaith, ACS Nano, 2014, 8, 9815
3- B. Skromme, C. Sandroff, E. Yablonovitch and T. Gmitter, Appl. Phys. Lett., 1987, 51, 2022
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