THIOCYANATE-FREE, PANCHROMATIC RUTHENIUM (II) TERPYRIDINE SENSITIZER HAVING A TRIDENTATE DIETHYLENETRIAMINE LIGAND FOR NEAR-IR SENSITIZATION OF NANOCRYSTALINE TiO2

Abstract

A thiocyanate-free Ru (II) terpyridine complex containing a tridentate chelating ligand diethylenetriamine, Ru (4,4′, 4″-tricarboxy-2,2′:6′, 2″-terpyridine)(diethylenetriamine) 1 achieves very efficient panchromatic sensitization of nanocrystalline TiO 2 solar cell over the whole visible range extending into the near IR region (ca. 900 nm) with a maximum value of 76% at around 600 nm. A solar energy to electric power conversion efficiency (η) of 7.9% was attained under standard AM 1.5 irradiation (100 mW cm-2) with a short-circuit photocurrent density (J sc ) of 17.5 mA cm-2, an open-circuit photovoltage (V oc ) of 0.67 V, and a fill factor (ff) of 0.68.