Conjugated polymeric zwitterions as efficient interlayers in organic solar cells

Abstract

Conjugated polymeric zwitterions, when utilized as interlayer materials in bulk heterojunction organic solar cells, lead to significantly enhanced power conversion efficiencies. The electrostatic model of self-aligning dipolar side groups in the vicinity of the metal surface rationalizes the effects of reduced cathode work function, a key factor behind the observed enhanced efficiency.

Keywords: Organic solar cells; electrostatic self-alignment of dipoles; interfacial dipole; ultraviolet photoelectron spectroscopy; zwitterionic polymers.