No abstract

Highlights Integration of solar cells, BSHs, and LEDs was developed for energy conversion, storage, and utilization in one system. NiCo 2 O 4 //AC BSHs were charged by a-Si/H solar cells for stably driving LEDs showing high performances. Electronic supplementary material The online version of this article (10.1007/s40820-019-0274-0) contains supplementary material, which is available to authorized users.

Amorphous silicon-zinc-tin-oxide (α-SZTO) thin films were prepared, and their properties were investigated physically and electrically, with an emphasis on the Si effects. An appropriate Si content in the matrix can not only achieve stable and dense films, but also suppress the formation of oxygen vacancies efficiently, due to its high oxygen bonding ability. Thin film transistors (TFTs) with α-SZTO active channel layers exhibited a field-effect mobility of around 1 cm2V−1s−1, an on/off current ratio of 107, and a subthreshold swing of 0.863 V/decade with a good long-term stability. The α-SZTO TFT is a potential candidate for electronic applications.

No abstract

No abstract

Two-dimensional (2D) perovskites represent a class of promising nanostructures for optoelectronic applications owing to their giant oscillator strength transition of excitons and high luminescence. However, major challenges lie in the surface ligand engineering and ambient stability. Here, we show that air-stable quasi-2D CsPbBr3 nanoplatelets can be formed in the matrix of Cs4PbBr6 nanosheets by reducing the thickness of Cs4PbBr6 to ∼7.6 nm, the scale comparable to the exciton Bohr radius of CsPbBr3. The 2D behavior of excitons is evidenced by the linear increase of the radiative lifetime with increasing temperature. Moreover, the wide-bandgap Cs4PbBr6 plays roles of surface passivation and protection, which leads to good photoluminescence properties without the photobleaching effect and with ambient stability for over 1 month. Our work demonstrates a unique quasi-2D heterostructure of perovskite nanomaterials, which may either serve as a workbench for studying the exciton recombination dynamics or find application in high-performance optoelectronic devices.

Colloidal all-inorganic perovskite CsPbBr3 nanocrystals present versatile outstanding optoelectronic properties as well as greatly improved stability when compared with their hybrid analogues. However, the performance of blue-emitting CsPbBr3 nanocrystals is still inferior to their green counterpart. Moreover, their synthesis generally demands a high temperature and inert gas environment. Synthesis of perovskite nanocrystals with high efficiency blue emission in air ambience is highly desired. In this work we demonstrate a top-down strategy for the facile synthesis of blue-emitting CsPbBr3 quantum dots (QDs) in ambient air through cutting CsPbBr3 nanoplatelets (NPLs) into spherical QDs with the assistance of ultrasonication and hydrobromic acid (HBr) treatment. The CsPbBr3 QDs show excellent monodispersion with an average size of about 5 nm and a blue emission at 460 nm with high photoluminescence quantum yield (PL QY) of 53.2%. The key role of HBr is suggested to solubilize the inorganic cores of the NPLs and repair the surface. The CsPbBr3 QDs are used to prepare mixed phosphors emitting high quality white light.

Violet photoluminescence was observed in high-energy hydrogen-plasma-treated ZnO nanorods at 13 K. The photoluminescence spectrum is dominated by a strong violet emission and a shoulder attributed to excitonic emission. The violet emission shows normal thermal behavior with an average lifetime of about 1 μs at 13 K. According to the time-resolved and excitation density-dependent photoluminescence, it was found that the violet emission is determined by at least two emitting channels, which was confirmed by annealing experiments. Evidence was also given that the violet emission is related to hydrogen. We suggested that the hydrogen-related complex defects formed under high-energy hydrogen plasma treatment are responsible for this violet emission.