Dye for dye-sensitized solar cells, method of preparing the same, and solar cell including the dye

A dye for a dye-sensitized solar cell, the dye comprising an organometallic complex represented by Formula 1:

• M(L)pX2:(Z)q Formula 1
• wherein,
• M is an element selected from the group consisting of Group 8 through Group 10 metallic elements,
• X is a co-ligand selected from the group consisting of —CN, —OH, —I, —Cl, —NCO, —NCS, and —NCSe,
• L is a bidentate ligand represented by Formula 2:
• Z is a counter-ion represented by Formula 3:
• and
• p equals 2, and the mole ratio of p to q is about 1.1 to about 1.4,
• wherein:
• each of R1 and R2 is independently selected from the group consisting of COOH, PO3H2, PO4H2, SO3H2, SO4H2, and CONHOH,
• at least one of R1 and R2 is deprotonized, and
• each of R3 through R6 is independently selected from the group consisting of substituted and unsubstituted C1-20 alkyl groups, substituted and unsubstituted C1-20 alkoxy groups, substituted and unsubstituted C2-20 alkenyl groups, substituted and unsubstituted C2-20 alkynyl groups, substituted and unsubstituted C6-30 aryl groups, substituted and unsubstituted C6-30 aryloxy groups, and substituted and unsubstituted C2-30 heteroaryl groups.