Non-fullerene acceptors with optimized energy levels enable 10% efficient solar cells with reduced voltage losses <0.6 V.

We have investigated coherent time evolution of pseudomolecular states of an isolated (leadless) silicon double quantum dot, where operations are carried out via capacitively coupled elements. Manipulation is performed by short pulses applied to a nearby gate, and measurement is performed by a single-electron transistor. The electrical isolation of this qubit results in a significantly longer coherence time than previous reports for semiconductor charge qubits realized in artificial molecules.

Traditionally, the properties and functions of covalent organic frameworks (COFs) are defined by their constituting building blocks, while the chemical bonds that connect the individual subunits have not attracted much attention as functional components of the final material. We have developed a new series of dual-pore perylene-based COFs and demonstrate that their imine bonds can be protonated reversibly, causing significant protonation-induced colour shifts towards the nearinfrared, while the structure and crystallinity of the frameworks are fully retained. Thin films of these COFs are highly sensitive colorimetric acid vapour sensors with a detection limit as low as 35 µg L-1 and a response range of at least four orders of magnitude. Since the acidochromism in our COFs is a cooperative phenomenon based on electronically coupled imines, the COFs can be used to determine simultaneously the concentration and protonation strength of non-aqueous acid solutions, in which pH electrodes are not applicable, and to distinguish between different acids. Including the imine bonds as functiondetermining constituents of the framework provides an additional handle for constructing multifunctional COFs and extending the range of their possible applications.

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Strong-coupling between excitons and confined photonic modes can lead to the formation of new quasi-particles termed exciton-polaritons which can display a range of interesting properties such as super-fluidity, ultrafast transport and Bose-Einstein condensation. Strong-coupling typically occurs when an excitonic material is confided in a dielectric or plasmonic microcavity. Here, we show polaritons can form at room temperature in a range of chemically diverse, organic semiconductor thin films, despite the absence of an external cavity. We find evidence of strong light-matter coupling via angle-dependent peak splittings in the reflectivity spectra of the materials and emission from collective polariton states. We additionally show exciton-polaritons are the primary photoexcitation in these organic materials by directly imaging their ultrafast (5 × 106 m s−1), ultralong (~270 nm) transport. These results open-up new fundamental physics and could enable a new generation of organic optoelectronic and light harvesting devices based on cavity-free exciton-polaritons

The creation of light-harvesting antenna complexes offers numerous potential applications in the field of optoelectronics. Cesium lead halide nanocrystals, specifically, are beginning to show great promise for optoelectronic applications due to their thermal stability and bright luminescence. As per the majority of all colloidally stable nanocrystals, they process surface-bound ligands that offer stability and surface state passivation. By replacing these ligands with organic chromophores various energy interactions can be observed, leading to a greater variety of potential applications. In this paper, we show enhanced emission in red and orange perylene diimide organic dye ligands through the transfer of energy harvested by CsPbBr 3 nanocrystals. This has been demonstrated via steady-state and time-resolved fluorescence measurements and has a great potential for spectral management through energy-transfer interactions in hybrid light-harvesting systems. We estimate the Forster resonance energy-transfer efficiencies of up to 65 and 45% for perylene orange ligand surface loadings of 0.25 nm −2 and perylene red ligand surface loadings 0.12 nm −2 , respectively.