Affiliation:
1. Department of Electric Electronic and Automatic Engineering Universitat Rovira i Virgili Avda. Països Catalans 26 43007 Tarragona Spain
2. Institute of Chemical Research of Catalonia (ICIQ-BIST) Av. Països Catalans 16 43007 Tarragona Spain
3. ICREA Passeig Lluís Companys 23 08010 Barcelona Spain
Abstract
A ternary strategy has been demonstrated as being an effective method to improve the power conversion efficiency (PCE); however, general rules for materials selection are not fully comprehended. Herein, nonfullerene acceptor ITIC‐M and fullerene acceptor PC70BM possessing higher lowest unoccupied molecular orbital (LUMO) and good miscibility with nonfullerene acceptor Y7 are incorporated as third components in the state‐of‐the‐art of PM6:Y7 binary blend. As a result, the device PCE for both ternary devices improves from 16.46% for binary host to 17.73% and 17.67% for ITIC‐M‐ and PC70BM‐based ternary devices, respectively. The higher LUMO of the guest acceptor can play multiple roles to elevate the open‐circuit voltage such as reducing energy‐loss and reverse saturation current, creating less‐localized shallow trap sites along with suppressing charge recombination, and decreasing Urbach energy. Moreover, the good miscibility facilitates an alloy‐like phase in acceptors domain for efficient exciton dissociation and electron transport, which leads to improved short‐circuit current density and fill factor in ternary devices. The results provide a promising approach to realize high‐performance ternary organic solar cells by synergizing the compatible third component with host acceptor.
Funder
Ministerio de Ciencia, Innovación y Universidades
Agència de Gestió d'Ajuts Universitaris i de Recerca
H2020 Marie Skłodowska-Curie Actions
Subject
Electrical and Electronic Engineering,Energy Engineering and Power Technology,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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