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

Abstract

All-polymer solar cells (all-PSCs) have been widely studied owing to their unique mechanical flexibility and stability. However, all-PSCs have a lower efficiency than small-molecule acceptor-based PSCs. In the work, a ternary quasi-all-polymer solar cell (Q-all-PSC) using a synergy of the ternary strategy and solid additive engineering is reported. The introduction of PC71BM can not only match the energy level of the photoactive materials with an improved open circuit voltage (V OC) of the ternary devices but also enhance photon capture, which can improve short circuit current density. It is found that there is effective charge transfer between PC71BM and PY-IT, which can form an electron transport channel and promote efficient charge transport. Moreover, the introduction of PC71BM made the PM6/PY-IT/PC71BM ternary blends more crystalline while slightly reducing phase separation, resulting in a suitable domain size. Importantly, by introducing a high dielectric-constant PFBEK solid additive as the fasten matrix, the Q-all-PSC’s efficiency can reach 16.42%. This method provides a new idea for future research on all-polymer solar cells.

Profound Influences of Two-Dimensional Side Chains Regional Transfer on Crystallinity and Photovoltaic Performance of Donor Polymers

“…37 Figure 4e presents the J ph −V eff curves of PQR16-BTF and PQTF-BO devices to understand the information on exciton dissociation and charge collection within the devices. 38,39 The current of the PQR16-BTF-based device can reach saturation more quickly, indicating that at a lower voltage drive the transport of electrons and holes is faster. Table S5 calculates the exciton dissociation and charge collection efficiency of the two material device systems.…”

Improving the Photovoltaic Performance of PBDB-T:PC71BM-Based Ternary Solar Cells by Employing Arylmethylene-Substituted Small Molecules as the Guest Acceptor

“…Although nonfullerene acceptor-based PD:SMA1:SMA2 ternary PSCs are the mainstream of ternary device development, fullerene acceptor (FA)-based ternary PSCs also have received considerable attention due to their own advantages of FAs, such as high electron mobility, large electron affinity, and isotropic charge transport. − As one most representative FA, phenyl-C 71 -butyric acid methyl ester (PC 71 BM; Figure ) was used as the host acceptor or the third component (guest acceptor) to construct many high-performance PD:FA:SMA-type ternary PSCs benefitting from the combination of their respective advantages of FAs and SMAs. − Among them, the PBDB-T:PC 71 BM combination is one of the most studied host binary systems because it has desirable properties and is commerically available. − Tang et al used PC 71 BM and SMA IPIC-4Cl as the guest and host acceptors, respectively, to fabricate PBDB-T:PC 71 BM:IPIC-4Cl (weight ratio: 1:0.3:1) ternary PSCs, and a high PCE of 14.3% was obtained . Bo and co-workers used a similar strategy to obtain PBDB-T:PC 71 BM:IDT-2O (weight ratio: 1:0.2:0.8) ternary PSCs with a PCE over 10% .…”

Toluene Processed All‐Polymer Solar Cells with 18% Efficiency and Enhanced Stability Enabled by Solid Additive: Comparison Between Sequential‐Processing and Blend‐Casting

“…Furthermore, the best efficiency of most recent high-performance all-PSCs was achieved using chloroform as the processing solvent including PJ1r. [10,11,29,[31][32][33][34][35][36][37][38][39][40][41][42] In addition to its hazardous properties, chloroform has a high vapor pressure at temperatures relevant to device fabrication, making it unsuitable for large-scale fabrication techniques such as slot-die coating and blade-coating. [43][44][45][46][47][48][49][50][51] To take advantage of the superior film-formation properties and mechanical properties of all-PSCs in future large-scale productions, chloroform must be replaced processing solvent with a high boiling point at standard pressure, preferentially non-halogen solvents.…”