Solar cells fabricated using alkyl ammonium metal halides as light absorbers have the right combination of high power conversion efficiency and ease fabrication to realize inexpensive but efficient thin film solar cells. However, they degrade under prolonged exposure sunlight. Herein, we show that this degradation is quasi-reversible, it can be greatly lessened by simple modifications cell operating conditions. We studied perovskite devices electrochemical impedance spectroscopy (EIS) with...

Interface engineering is critical for achieving efficient solar cells, yet a comprehensive understanding of the interface between metal electrode and electron transport layer (ETL) lacking. Here, significant power conversion efficiency (PCE) improvement fullerene/perovskite planar heterojunction cells from 7.5% to 15.5% shown by inserting fulleropyrrolidine interlayer silver ETL. The ETL carefully examined using variety electrical surface potential techniques. Electrochemical impedance...

Perovskite-containing tandem solar cells are attracting attention for their potential to achieve high efficiencies. We demonstrate a series connection of ∼90 nm thick perovskite front subcell and ∼100 polymer:fullerene blend back that benefits from an efficient graded recombination layer containing zwitterionic fullerene, silver (Ag), molybdenum trioxide (MoO3). This methodology eliminates the adverse effects thermal annealing or chemical treatment occurs during fabrication on polymer-based...

A significant challenge in the rational design of organic thermoelectric materials is to realize simultaneously high electrical conductivity and induced-voltage response a thermal gradient, which represented by Seebeck coefficient. Conventional wisdom posits that polymer alone dictates efficiency. Herein, we show doping - particular, clustering dopants within conjugated films has profound predictable influence on their properties. We correlate coefficient iodine-doped poly(3-hexylthiophene)...

Poly(Phenylene vinylene) anionic polyelectrolyte (PVBT-SO3) was found to be an efficient hole extraction layer for inverted perovskite solar cells. It can cast from aqueous solution and does not require thermal annealing improved device performance. The devices show maximum cell efficiency of 15.9% exhibit stability under ambient conditions enhanced charge extraction. As a service our authors readers, this journal provides supporting information supplied by the authors. Such materials are...

We address here the need for a general strategy to control molecular assembly over multiple length scales. Efficient organic photovoltaics require an active layer comprised of mesoscale interconnected networks nanoscale aggregates semiconductors. demonstrate method, using principles self-assembly and geometric packing, controlled semiconductors at mesoscale. Nanoparticles poly(3-hexylthiophene) (P3HT) or [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were fabricated with targeted sizes....

We studied ion transport in hybrid organic–inorganic perovskite p-i-n devices as a function of applied bias under device operating conditions. Using electrochemical impedance spectroscopy (EIS) and equivalent circuit modeling, we elucidated various resistive capacitive elements the device. show that migration is predictably influenced by low forward bias, characterized an increased capacitance at hole-transporting (HTM) electron-transporting material (ETM) interfaces, well bulk. However,...

Fabricating macromolecular mesoscale assemblies containing disparate components with targeted molecular order for each of the on nanoscale and assembly in is a challenge. In this Perspective, we explore self-assembly polymer nanoparticles as viable route to obtain tunable mesostructured materials. We describe state-of-the-art methods available challenges spherical nonspherical nanoparticles. discuss predicted ordered disordered these also comment rich future opportunities burgeoning field...

We report the processing conditions for fabricating efficient organic solar cells from aqueous dispersions of conjugated polymer nanoparticles.

Abstract Hybrid organic/inorganic perovskite solar cells are invigorating the photovoltaic community due to their remarkable properties and efficiency. However, many show an undesirable current–voltage ( I – V ) hysteresis in forward reverse voltage scans, working detriment of device characterization performance. This likely arises from slow ion migration bulk active layer interfaces which may induce charge trapping. It is shown that interfacial chemistry between transport plays a critical...

Energy densities of ~510 J/g (max: 698 J/g) have been achieved in azobenzene-based syndiotactic-rich poly(methacrylate) polymers. The processing solvent and polymer-solvent interactions are important to achieve morphologically optimal structures for high-energy density materials. This work shows that morphological changes solid-state syndiotactic polymers, driven by different processings play an role controlling the activation energy Z-E isomerization as well shape DSC exotherm. Thus, this...

The interface between solid electrolytes and Li metal anode is a significant hurdle for the development of all-solid-state lithium batteries. Introducing thin gel polymer electrolyte interlayer to conformally coat can improve wettability thus reduce interfacial resistance. Here we used plasticized poly(ethylene oxide)-based with high concentrations bis(trifluoromethane)sulfonamide (LiTFSI) that show 100% amorphous character. These + conductivity as σ = 2.9 × 10 −4 S cm −1 at room...

3,6-Bis(N,N-dianisylamino)-fluoren-9-ylidene malononitrile (FMBDAA36) was used as an electron donor material in solution-processed organic photovoltaic devices with configuration ITO/PEDOT:PSS/(1:3[w/w] FMBDAA36:PC71BM)/LiF/Al to give power conversion efficiencies up 4.1% open circuit voltage VOC = 0.89 V, short current JSC 10.35 mA cm–2, and fill factor FF 44.8%. Conductive atomic force microscopy of the active layer showed granular separation regions exhibiting easy versus difficult hole...

Covalent attachment of photoacid dye molecules to perfluorinated sulfonic acid membranes is a promising route enable active light-driven ion pumps, but the complex relationship between chemical modification and morphology not well understood in this class functional materials. In study we demonstrate effect bound dyes on phase-segregated membrane morphology. Resonant X-ray scattering near sulfur K-edge reveals that introduction end ionomer side chains enhances phase segregation among...

Abstract Polymer‐based mixed ionic–electronic conductors (MIECs) are desired for both bulk and interfacial materials in next‐generation energy storage electronic devices. MIECs contain two principal components, one conduction the other ionic conduction. The central problem is lack of a general approach to control molecular packing morphology constituent components that will afford ability easily tune transport properties. This study demonstrates efficacy modular method based on polymer...

The kinetics of phosphine substitution in CpRu(PAr3)2Cl by PMePh2 under pseudo-first order conditions CDCl3 have been measured for PAr3 = PPh3, 1a, PPh2(p-tol), 1b, P(p-tol)3, 1c, P(p-CH3OC6H4)3, 1d, and P(p-FC6H4)3), 1e. Activation parameters characteristic a dissociative pathway (ΔH(†) 110-124 ± 2 kJ mol(-1), ΔS(†) 16-44 5-12 J mol(-1) K(-1)) are observed all five compounds. rate (1a) CpRu[P(p-FC6H4)3]2Cl (1e) is independent added chloride ion decreases the presence excess PAr3, however,...

Binary polymer nanoparticle glasses provide opportunities to realize the facile assembly of disparate components, with control over nanoscale and mesoscale domains, for development functional materials. This work demonstrates that tunable electrical percolation can be achieved through semiconducting/insulating by varying relative percentages equal-sized constituents binary assembly. Using time-of-flight charge carrier mobility measurements conducting atomic force microscopy, we show these...

Solid-state electrolytes are continually being explored for Li-ion batteries due to their enhanced safety and enabling of high energy density active materials, particularly Li metal anodes. However, the interface between solid-state anodes prone impedance poor contact, limiting applicability. Introducing a thin gel polymer electrolyte interlayer conformally coat solid can improve interfacial contact anode thus reduce resistance. Here we used plasticized poly(ethylene oxide)-based with...