Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Triphenylamine-based metal complexes (Y1, Y2 and Y3) were designed and synthesized via coordination to Ni(II), Cu(II), and Zn(II) using their respective acetate salts as the starting materials. The resulting metal complexes exhibit more negative energy levels (vs vacuum) as compared to 2,2′,7,7′-tetrakis-(N,N-di-p methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD), high hole extraction efficiency, but low hole mobilities and conductivities. resulting in satisfactory, but not excellent, PSC performance when applied as hole-transport materials. The best device performance was observed for the material based on nickel, with a conversion efficiency of 11.1% at very low film thickness. Lower efficiency compared with Spiro-OMeTAD could be the designed molecules have very limited conjugated structures because the metal in the center breaks the whole molecule into two separate entities. Futher modifying the structure by binding the pyrroles at ortho position, a porphyrin structure with big conjugation is formed as ligand. Coordination to Zn(II) gives a new metal complex Y4 with 50 times higher hole mobility when compared with Y3. Comparative efficiency of 16.05% to Spiro-OMeTAD was observed for Y4 at a relative higher thickness while Y3 could only give efficiency of 0.01%. Much increased hole mobility and planar structure of Y4 could be responsible for the huge difference in efficiency when applied as hole transport materials in perovskite solar cells.
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