We have synthesised Ru(H 2 -dcbpy)(N,NЈ-Y 2 -bpy)(NCS) 2 dyes (where N = 4, 5; Y = F, Cl, Br; N is the position on the bipyridyl ring where the halogen substituent is located) for dye-sensitised solar cells. We show that careful consideration of the position of the substituent, in conjunction with the nature of the substituents, on a bpy ring is important to optimize
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