Light-harvesting (LH) antenna complex was Successfully self-assembled on an ITO electrode modified with 3-aminopropyltriethoxysilane (APS-ITO). The reconstitution of the LH complex using LH polypeptides, isolated from photosynthetic bacteria, with Zn-BChl a formed an excitonically coupled state of Zn-BChl a complex on the electrode. Near infra-red (NIR) absorption and IR spectra indicated that the excitonically coupled Zn-BChl a and the LH polypeptides in an alpha-helical configuration were assembled on APS-ITO.