Organic solar cells comprising multiple-device stacked structures exhibiting complementary absorption behavior

Abstract

We developed organic solar cells based on multiple-device stacked structures featuring complementary absorption behavior. The first, semitransparent (ST) subcell featured an inverted structure; its anode comprised a MoO3/Ag bilayer. This structure provided a transmittance of greater than 35% in the visible region. The second subcell, featuring a low-band-gap small molecule in its photoactive layer, was stacked onto the ST device; the two subcells could be connected either in series or in parallel. Because the two subcells exhibited complementary absorption behavior, their stacked structure connected in parallel displayed a power conversion efficiency of 4.37%, greater than those of the isolated subcells. (C) 2013 Elsevier B.V. All rights reserved.