Synergetic Strategy for Highly Efficient and Super Flexible Thick‐film Organic Solar Cells

Abstract

Efficient organic solar cells (OSCs) equipped with thick‐film active layers and high flexibility are of great significance for industrial preparation and practical applications. Herein, a ternary strategy coupled with a functional additive is employed to obtain efficient thick‐film flexible OSCs. A novel polymer donor PBB1‐F with good planarity is synthesized as a third component to optimize photon capture and molecular stacking. Meanwhile, a high dielectric constant polyarene ether (PAE) functional additive with strong adhesion not only greatly improves exciton dissociation efficiency, but also acts as locking cage‐like for effective enhancement of the mechanical stability of active layer. As a result, the PM6:PBB1‐F:Y6‐BO‐4Cl and PM6:PBB1‐F:BTP‐eC9 based ternary OSCs with PAE exhibit an efficiency of 17.91% and 18.51% under rigid thin‐film state, and perform better under thick‐film state of rigid (16.40% and 16.84%) and flexible (14.78% and 14.95%). Under the protection of the polymers, tight entanglement and cage‐like PAE adhesion, the elongation at break of the active layer increases by more than fourfold (27.3%), and gives a super flexible thick‐film OSCs that maintains more than 90% performance after 1000 bending cycles with a diameter of 10 mm. Overall, this work provides a new feasible scheme to effectively solve thickness sensitivity and flexibility issues in the context organic photovoltaic applications.

Unveiling the Morphological and Physical Mechanism of Burn‐in Loss Alleviation by Ternary Matrix Toward Stable and Efficient All‐Polymer Solar Cells

“…Then crack-onset-strain (COS) as another important figureof-merit for all-polymer blend is evaluated, which represents the film ductility. [42][43][44][45][46][47] As presented in Figure 1d and Table S1 (Supporting Information), the strain-stress curves of all-polymer blends are presented in Figure 2d and their derived COS and mechanical toughness values are listed in Table S1 (Supporting Information). It was found that the proper addition of PTQ10 could significantly boost the ductility of active layers in this work.…”

Formation of Efficient Quasi-All-Polymer Solar Cells by Synergistic Effect of the Ternary Strategy and Solid Additives

“…Hence, improved morphology can give better charge transport and lower carrier recombination, which further explains the phenomenon of the higher J SC in the ternary OSC. In addition, the high dielectric constant PFBEK is added to regulate the phase separation, crystallinity, and electric field of the ternary device, , which can further increase the photovoltaic efficiency.…”

The Dynamics of Delocalized Excitations in Organic Solar Cells with Nonfullerene Acceptors

“…Moreover, the exciton diffusion can be further improved by texturing the intermolecular interaction in mixed NFAs, , enabling efficient light-to-electricity conversion in ternary systems. Thick active layers can be applied in NFA-based devices with PCEs largely retained toward practical applications. − …”