Robust nanogenerator based on poly(tert-butyl acrylate)–grafted PVDF copolymers via dielectric constant control is demonstrated.

Considering the potential applications of all-polymer solar cells (all-PSCs) as wearable power generators, there is an urgent need to develop photoactive layers that possess intrinsic mechanical endurance, while maintaining a high power-conversion efficiency (PCE).Herein a strategy is demonstrated to simultaneously control the intercalation behavior and nanocrystallite size in the polymer-polymer blend by using a newly developed, high-viscosity polymeric additive, poly(dimethylsiloxane-co-methyl phenethylsiloxane) (PDPS), into the TQ-F:N2200 all-PSC matrix. A mechanically robust 10wt% PDPS blend film with a great toughness was obtained. Our results provide a feasible route for producing high-performance ductile all-PSCs, which can potentially be used to realize stretchable all-PSCs as a linchpin of next-generation electronics.

Despite rapid advances in the field of nonfullerene polymer solar cells (NF‐PSCs), successful examples of random polymer‐based NF‐PSCs are limited. In this study, it is demonstrated that random donor polymers based on thieno[2′,3′:5′,6′]pyrido[3,4‐g]thieno[3,2‐c]isoquinoline‐5,11(4H,10H)‐dione (TPTI) containing two simple thiophene (T) and bithiophene (2T) electron‐rich moieties (PTTI‐Tx) can be promising materials for the fabrication of highly efficient NF‐PSCs. With negligible influence on optical bandgaps and energy levels, the crystalline behavior of PTTI‐Tx polymers was modulated by varying the T:2T ratio in the polymer backbone; this resulted in the formation of different microstructures upon blending with a nonfullerene m‐ITIC acceptor in NF‐PSCs. In particular, a PTPTI‐T70:m‐ITIC system enabled favorable small‐scale phase separation with an increased population of face‐on oriented crystallites, thereby boosting the processes of effective exciton dissociation and charge transport in the device. Consequently, the highest power conversion efficiency of 11.02% with an enhanced short‐circuit current density of 17.12 mA cm−2 is achieved for the random polymer‐based NF‐PSCs thus far. These results indicate that random terpolymerization is a simple and practical approach for the optimization of a donor polymer toward highly efficient NF‐PSCs.

A newly synthesized high-k polymeric insulator for use as gate dielectric layer for organic field-effect transistors (OFETs) obtained by grafting poly(methyl methacrylate) (PMMA) in poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) via atom transfer radical polymerization transfer is reported. This material design concept intents to tune the electrical properties of the gate insulating layer (capacitance, leakage current, breakdown voltage, and operational stability) of the high-k fluorinated polymer dielectric without a large increase in operating voltage by incorporating an amorphous PMMA as an insulator. alt-5,5′-(2,2′-bithiophene)) are demonstrated here. DPPT-TT OFETs with P(VDF-TrFE)-g-PMMA gate dielectrics exhibit a reasonably high field-effect mobility of over 1 cm 2 V −1 s −1 with excellent operational stability. By controlling the grafted PMMA percentage, an optimized P(VDF-TrFE)-g-PMMA with 7 mol% grafted PMMA showing reasonably high capacitance (23-30 nF cm −2 ) with low voltage operation and negligible current hysteresis is achieved. High-performance low-voltage-operated top-gate/bottom-contact OFETs with widely used high mobility polymer semiconductors, poly[[2,5bis(2-octyldodecyl)-2,3,5,6-tetrahydro-3,6-dioxopyrrolo [3,4-c]pyrrole-1,4-diyl]alt-[[2,2′-(2,5-thiophene)bis-thieno(3,2-b)thiophene]-5,5′-diyl]] (DPPT-TT), and poly([N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-

It is known that grafting one polymer onto another polymer backbone is a powerful strategy capable of combining dual benefits from each parent polymer. Thus amphiphilic graft copolymer precursors (poly(vinylidene difluoride)-graft-poly(tert-butylacrylate) (PVDF-g-PtBA)) have been developed via atom transfer radical polymerization, and demonstrated its outstanding properties as a promising binder for high-performance lithium-ion battery (LIB) by using in situ pyrolytic transformation of PtBA to poly(acrylic acid) segments. In addition to its superior mechanical properties and accommodation capability of volume expansion, the Si anode with PVDF-g-PtBA exhibits the excellent charge and discharge capacities of 2672 and 2958 mAh g(-1) with the capacity retention of 84% after 50 cycles. More meaningfully, the graft copolymer binder shows good operating characteristics in both LiN0.5 M1.5 O4 cathode and neural graphite anode, respectively. By containing such diverse features, a graft copolymer-loaded LiN0.5 M1.5 O4 /Si-NG full cell has been successfully achieved, which delivers energy density as high as 546 Wh kg(-1) with cycle retention of ≈70% after 50 cycles (1 C). For the first time, this work sheds new light on the unique nature of the graft copolymer binders in LIB application, which will provide a practical solution for volume expansion and low efficiency problems, leading to a high-energy-density lithium-ion chemistry.