NOVELTY - Linker portion is added to porphyrin to form initial structure (A). Microparticle is surrounded with structures (A) to form structure (I). Structure (A) is partially substituted by short chain structure and hole is introduced to structure (I) surface. Structure (I) and acceptor molecule are mixed and molecule is introduced to structure (I) to form structure (II). Structures (II) are self-assembled to form self-assembling structure.    USE - For manufacture of self-assembling structure used for manufacture of electrode used for organic solar cell (both claimed).    ADVANTAGE - The organic solar cell obtained using the self-assembling structure has high energy conversion efficiency.    DETAILED DESCRIPTION - A linker portion is added to porphyrin to form an initial structure. Metal microparticle is surrounded with several initial structure by coupling linker portion to metal microparticle, and structure (I) is formed. The initial structure surrounding the microparticle is partially substituted with short chain structure having less chain length than the initial structure and a surface hole for taking acceptor molecule is introduced to outer surface of structure (I). The structure (I) having surface hole and acceptor molecule are mixed in nonpolar solvent, and acceptor molecule is introduced to structure (I) to form structure (II). Several structures (II) are self-assembled in mixed solvent of polar solvent and non-polar solvent to obtain self-assembling structure.    INDEPENDENT CLAIMS are included for the following:    (1) manufacture of organic solar cell, which involves inserting the self-assembling structure between light transparent electrode and counter electrode in which metal oxide is provided; and    (2) manufacture of electrode, which involves electrodepositing self-assembling structure on light transparent electrode on which metal oxide is provided and forming systematic structure.    DESCRIPTION OF DRAWING(S) - The figure shows manufacturing process of organic solar cell. (Drawing includes non-English language text).