Patent ID: 7425722

Claim:
An organic compound crystal comprising: π-electron conjugated molecules each containing chalcogen atoms as a constituent, wherein among chalcogen atoms (X i ) in a π-electron conjugated molecule and chalcogen atoms (X j ) in its adjacent π-electron conjugated molecule, the distance R ij between at least one pair of chalcogen atoms (X i , X j ) satisfies the relationship R ij ≦(r 1 +r 2 )×1.1, wherein r 1 is the van der Waals' radius of the chalcogen atom in the π-electron conjugated molecule, and r 2 is the van der Waals' radius of the chalcogen atom in its adjacent π-electron conjugated molecule, wherein, in each π-electron conjugated molecule, the chalcogen atoms are placed on the outer periphery of the molecule, wherein the π-electron conjugated molecules are each represented by general formula (1): wherein X 1 , X 2 , X 3 , X 4 each are a sulfur atom, and the organic compound crystal has a periodic structure in which π-electron conjugated molecules are two-dimensionally or three-dimensionally linked together.