Suppressing electron-phonon coupling and energy loss in organic solar cells by modulating donor-acceptor penetrated-interface.

ABSTRACT: Organic solar cells (OSCs) achieve 21% efficiency, yet non-radiative energy loss (qΔV_nr) remains a critical barrier to further improve the open-circuit voltage (V_OC). This loss is primarily governed by the optoelectronic properties of interfacial CT states, yet the precise role of electron-phonon coupling (EPC) is not fully resolved. Through analysis of three all-polymer OSCs and four small molecule acceptor (SMA)-based OSCs, we identify two donor-acceptor (D-A) interfacial mixed phases that foster two distinct CT states, establishing efficient charge generation. These two phases emerge from amorphous D-A entanglement, termed as Entangled (E-) interface, and the penetration of acceptor quasi-aggregates into donor polymer matrix, termed as Penetrated (P-) interfaces. T

SUBMITTER: Luo Y 

PROVIDER: S-EPMC12946207 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature