Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102559
Keywords
all-polymer solar cells; face-on orientation; long-term stability; thickness-insensitivity; thienylene-vinylene-thienylene
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Funding
- National Key Research and Development Program of China - MOST [2019YFA0705900]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- Natural Science Foundation of China [21875073, 51973032]
- Distinguished Young Scientists Program of Guangdong Province [2019B151502021]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
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Novel polymerized small molecular acceptors, PJTVT and PJTET, were designed with conjugated and unconjugated linking units respectively, demonstrating improved efficiency and stability for all-polymer solar cells through molecular modulation in the linking unit of the polymer acceptor.
Despite the rapid developments in all-polymer solar cells (all-PSCs) due to the progress of polymerized small molecular acceptors (PSMA), the effect of linkage unit conjugation on the polymer acceptor (P-A) is not well understood and P(A)s with high efficiency, good stability, and thickness-insensitivity are rarely seen. Herein, two novel PSMAs, named PJTVT and PJTET are designed, by incorporating conjugated thienylene-vinylene-thienylene (TVT) and unconjugated thienylene-ethyl-thienylene (TET) units, respectively. Results show that the energy levels, energy losses, and energy offset of the two PSMAs have little difference (0.03 eV). However, due to the pi-extended coplanar backbone of PJTVT, when blended with polymer donor JD40, a more ordered pi-pi stacking and enhanced face-on orientation morphology is observed, which contributes to enhanced exciton dissociation, superior charge transport, and faster charge extraction, leading to a record power conversion efficiency of 16.13% (10.93% for JD40:PJTET). Impressively, the JD40:PJTVT device shows superior thickness-insensitivity and long-term stability, both of which make it an ideal choice for industrialization. These results demonstrate that molecular modulation in the linking unit is a promising strategy to construct PSMAs for high-performance thick-film all-PSCs with superior long-term stability, and shows the superiority of conjugated backbones for PSMAs.
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