The hybrid halide perovskites, the very performant compounds in photovoltaic applications, possess large Seebeck coefficient and low thermal conductivity making them potentially interesting high figure of merit (ZT) materials. For this purpose one needs to tune the electrical conductivity of these semiconductors to higher values. We have studied the CH3NH3MI3 (M=Pb,Sn) samples in pristine form showing very low ZT values for both materials; however, photoinduced doping (in M=Pb) and chemical doping (in M=Sn) indicate that, by further doping optimization, ZT can be enhanced toward unity and reach the performance level of the presently most efficient thermoelectric materials.X. Mettan et al. 04.26.2015 1

The first hybrid phototransistors are reported where the performance of a network of photoactive CH3NH3PbI3 nanowires is enhanced by CVD‐grown monolayer graphene. These devices show responsivities as high as ≈2.6 × 106 A W−1 in the visible range, showing potential as room‐temperature single‐electron detectors.

Highlights We present the first WHO/ILO Joint Estimates of the Work-related Burden of Disease and Injury. Globally in 2016, 488 million people were exposed to long working hours (≥55 hours/week). This exposure had 745,194 attributable deaths and 23.3 million DALYs from ischemic heart disease and stroke. These are 4.9% of all deaths and 6.9% of all DALYs from these causes. The Western Pacific, South-East Asia, men, and older people carried higher burdens.

The demand for ever-increasing density of information storage and speed of manipulation boosts an intense search for new magnetic materials and novel ways of controlling the magnetic bit. Here, we report the synthesis of a ferromagnetic photovoltaic CH3NH3(Mn:Pb)I3 material in which the photo-excited electrons rapidly melt the local magnetic order through the Ruderman–Kittel–Kasuya–Yosida interactions without heating up the spin system. Our finding offers an alternative, very simple and efficient way of optical spin control, and opens an avenue for applications in low-power, light controlling magnetic devices.

Spatial positioning of nanocrystal building blocks on a solid surface is a prerequisite for assembling individual nanoparticles into functional devices. Here, we report on the graphoepitaxial liquid-solid growth of nanowires of the photovoltaic compound CH3NH3PbI3 in open nanofluidic channels. The guided growth, visualized in real-time with a simple optical microscope, undergoes through a metastable solvatomorph formation in polar aprotic solvents. The presently discovered crystallization leads to the fabrication of mm2-sized surfaces composed of perovskite nanowires having controlled sizes, cross-sectional shapes, aspect ratios and orientation which have not been achieved thus far by other deposition methods. The automation of this general strategy paves the way towards fabrication of wafer-scale perovskite nanowire thin films well-suited for various optoelectronic devices, e.g. solar cells, lasers, light-emitting diodes and photodetectors.

X-ray photon detection is important for a wide range of applications. The highest demand, however, comes from medical imaging, which requires cost-effective, high-resolution detectors operating at low photon flux, therefore stimulating the search for novel materials and new approaches. Recently, hybrid halide perovskite CH3NH3PbI3 (MAPbI3) has attracted considerable attention due to its advantageous optoelectronic properties and low fabrication costs. The presence of heavy atoms, providing a high scattering cross-section for photons, makes this material a perfect candidate for X-ray detection. Despite the already-successful demonstrations of efficiency in detection, its integration into standard microelectronics fabrication processes is still pending. Here, we demonstrate a promising method for building X-2 ray detector units by 3D aerosol jet printing with a record sensitivity of 2.2 x 10 8 µC Gyair -1 cm -2 when detecting 8 keV photons at dose-rates below 1 Gy/s (detection limit 0.12 Gy/s), a fourfold improvement on the best-in-class devices. An introduction of MAPbI3-based detection into medical imaging would significantly reduce health hazards related to the strongly ionizing Xrays photons.

Based on the reported ion migration under electric field in hybrid lead halide perovskites we have developed a bright, light emitting electrochemical cell with CH3NH3PbBr3 single crystals directly grown on vertically aligned carbon nanotube (VACNT) forests as contact electrodes. Under the applied electric field, charged ions in the crystal drift and accumulate in the vicinity of the electrodes, resulting in an in operando formed p-i-n heterojunction. The decreased interface energy 2 barrier and the strong charge injection due to the CNT tip enhanced electric field, result in a bright green light emission up to 1800 cd/m 2 at room temperature (average ≈ 60 cd/m 2 ). Beyond the light emission, this original device architecture points to the possibility of implementing vertically aligned CNTs as electrodes in operationally-stable perovskite-based optoelectronic devices.

C59N magnetic fullerenes were formed inside single-wall carbon nanotubes by vacuum annealing functionalized C59N molecules encapsulated inside the tubes. A hindered, anisotropic rotation of C59N was deduced from the temperature dependence of the electron spin resonance spectra near room temperature. Shortening of spin-lattice relaxation time, T1, of C59N indicates a reversible charge transfer toward the host nanotubes above ∼ 350 K. Bound C59N-C60 heterodimers are formed at lower temperatures when C60 is co-encapsulated with the functionalized C59N. In the 10-300 K range, T1 of the heterodimer shows a relaxation dominated by the conduction electrons on the nanotubes.Single-wall carbon nanotubes (SWCNTs) [1, 2] exhibit a variety of unusual physical phenomena related to their one-dimensional and strongly correlated electronic properties. These include excitonic effects [3,4], superconductivity [5], the Tomonaga-Luttinger liquid state [6], and the Peierls transition [7]. Magnetic resonance is a powerful method to study strong correlations in low dimensional systems. However, for SWCNTs both nuclear magnetic resonance (NMR) and electron spin resonance (ESR) are severely limited by NMR active 13 C nuclei and ESR active electron spins in residual magnetic catalytic particles and other carbon phases. Synthesis of 13 C isotope engineered SWCNTs solved the problem for NMR [8,9]. To enable ESR spectroscopy of SWCNTs, a local probe, specifically attached to SWCNTs, is required. The N@C 60 [10] and C 59 N [11] magnetic fullerenes are ideal candidates for such studies. In fullerene doped SWCNTs, fullerenes occupy preferentially the interior of the tubes and form "peapods" (C 60 @SWCNT) [12]. Fullerenes adhesing to the outside can be removed [13] in contrast to e.g. filling with iron [14]. ESR on encapsulated magnetic fullerenes could yield information on the electronic state of the tubes and it could also enable to study the fullerene rotational dynamics in a confined environment. In addition, magnetic fullerene peapods could exploit the combination of the SWCNT strength and the magnetic moment of molecules in magnetic scanning probe tips and they could enable a bottom-up design for magnetic storage devices or for building elements of quantum computers [15].Typical spin concentrations in (N@C 60 :C 60 )@SWCNT are low, ∼1 spin/tube, and the N spins are insensitive to SWCNT properties [16]. The C 59 N monomer radical is a better local probe candidate as the unpaired electron is on the cage. C 59 N can be chemically prepared but it forms spinless dimers (C 59 N) 2 or monomer adducts [11].The magnetic C 59 N monomer radical can be stabilized as C 59 N:C 60 , a dilute solid solution of C 59 N in C 60 [17].Here, we report on the first ESR study of SWCNT properties and peapod rotational dynamics using a paramagnetic local probe: C 59 N monomer radicals encapsulated inside SWCNTs. SWCNTs were first filled with chemically inert C 59 N derivatives. A heat treatment in vacuum removes the side-group and the monomer radical is left behin...