BUSCADOR RECOLECTA

20 pages. -- PDF file includes S1. Substrate fabrication and growth details; S2. Degradation of surface topography after thermal oxide removal prior nanowire growth; S3. Faceting of GaAs(Sb) vs GaAs nanowires; S4. The role of InGaAs growth temperature; S5. The role of InAs growth temperature; S6. InAs/InGaAs field effect mobility measurements: influence of the InGaAs buffer growth temperature; S7. InAs/InGaAs band structure simulations; S8. Transport measurements of InGaAs/GaAs(Sb) SAG nanowires without the InAs channel; S9. InAs/InGaAs field effect mobility measurements: influence of the InAs growth temperature, figures and tables., ICN2 is supported by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706) and is funded by the CERCA Programme/Generalitat de Catalunya., Peer reviewed

52 pages. -- Supplementary Note 1. Growth directions, plane interactions and associated mismatches. -- Supplementary Note 2. Intermediate cases (gradual bending). -- Supplementary Note 3. Strain tensor maps (𝜀ij). -- Supplementary Note 4. Atomic modelling on non-faceted cores. -- Supplementary Note 5. Additional details on strain relaxation mechanisms and shell rotation. -- Supplementary Note 6. Details on the Core-shell misfit dislocations. -- Supplementary Note 7. Simulations on VEEL spectra. -- Supplementary Note 8. Methodology for band gap mapping., Peer reviewed

7 pages. -- PDF file includes: S1. AC HAADF STEM images of Ge/Ge0.92Sn0.08 core/shell NWs. -- S2. Estimate the gate capacitance of NW field-effect transistor. -- S3. Electrical characteristics of single Ge field-effect transistor. -- S4. Optical characteristics of single Ge/Ge0.92Sn0.08 core/shell NW detector. -- S5. FDTD simulation, Group IV Ge1–xSnx semiconductors hold the premise of enabling broadband silicon-integrated infrared optoelectronics due to their tunable band gap energy and directness. Herein, we exploit these attributes along with the enhanced lattice strain relaxation in Ge/Ge0.92Sn0.08 core/shell nanowire heterostructures to implement highly responsive room-temperature short-wave infrared nanoscale photodetectors. Atomic-level studies confirm the uniform shell composition and its higher crystallinity with respect to thin films counterparts. The demonstrated Ge/Ge0.92Sn0.08 p-type field-effect nanowire transistors exhibit superior optoelectronic properties achieving simultaneously relatively high mobility, high ON/OFF ratio, and high responsivity, in addition to a broadband absorption in the short-wave infrared range. Indeed, the reduced band gap of the Ge0.92Sn0.08 shell yields an extended cutoff wavelength of 2.1 μm, with a room-temperature responsivity reaching 2.7 A/W at 1550 nm. These results highlight the potential of Ge/Ge1–xSnx core/shell nanowires as silicon-compatible building blocks for nanoscale-integrated infrared photonics., Peer reviewed

9 pages. -- Contents: Supplementary Note 1: Two-dimensional hole gas properties. -- Supplementary Note 2: PtSiGe properties. -- Supplementary Note 3: SNS-QPC measurements. -- Supplementary Note 4: NS-QPC measurements. -- Supplementary Note 5: SQUID measurements. -- Supplementary Note 6: 1D array. -- Supplementary Note 7: Key metrics, Peer reviewed

The raw data are organized in folders based on the kind of device presented in the paper. The Juppyter notebooks contain the code for analyzing and plotting the data, there is one notebook for each figure of the papaer and supplementary. The scripts used to import the datasets of different kinds are contained in util_scripts, along with some other useful functions for plotting and formatting., Fig2 - SNS.ipynb, Peer reviewed

Animated movie with atomic 3D model of experimental particle., Rhodium–platinum core–shell nanoparticles on a carbon support (Rh@Pt/C NPs) are promising candidates as anode catalysts for polymer electrolyte membrane fuel cells. However, their electrochemical stability needs to be further explored for successful application in commercial fuel cells. Here we employ identical location scanning transmission electron microscopy to track the morphological and compositional changes of Rh@Pt/C NPs during potential cycling (10 000 cycles, 0.06–0.8 VRHE, 0.5 H2SO4) down to the atomic level, which are then used for understanding the current evolution occurring during the potential cycles. Our results reveal a high stability of the Rh@Pt/C system and point toward particle detachment from the carbon support as the main degradation mechanism., Peer reviewed

Animated movie with atomic 3D model of particle in thermodynamic equilibrium., Rhodium–platinum core–shell nanoparticles on a carbon support (Rh@Pt/C NPs) are promising candidates as anode catalysts for polymer electrolyte membrane fuel cells. However, their electrochemical stability needs to be further explored for successful application in commercial fuel cells. Here we employ identical location scanning transmission electron microscopy to track the morphological and compositional changes of Rh@Pt/C NPs during potential cycling (10 000 cycles, 0.06–0.8 VRHE, 0.5 H2SO4) down to the atomic level, which are then used for understanding the current evolution occurring during the potential cycles. Our results reveal a high stability of the Rh@Pt/C system and point toward particle detachment from the carbon support as the main degradation mechanism., Peer reviewed

Animated movie with segmented high-resolution tomographic reconstruction and orthoslice cut of as-synthesized Rh@Pt/C NPs., Rhodium–platinum core–shell nanoparticles on a carbon support (Rh@Pt/C NPs) are promising candidates as anode catalysts for polymer electrolyte membrane fuel cells. However, their electrochemical stability needs to be further explored for successful application in commercial fuel cells. Here we employ identical location scanning transmission electron microscopy to track the morphological and compositional changes of Rh@Pt/C NPs during potential cycling (10 000 cycles, 0.06–0.8 VRHE, 0.5 H2SO4) down to the atomic level, which are then used for understanding the current evolution occurring during the potential cycles. Our results reveal a high stability of the Rh@Pt/C system and point toward particle detachment from the carbon support as the main degradation mechanism., Peer reviewed

Animated movie with segmented low-resolution tomographic reconstruction of Rh@Pt/C NPs at 0 potential cycles., Rhodium–platinum core–shell nanoparticles on a carbon support (Rh@Pt/C NPs) are promising candidates as anode catalysts for polymer electrolyte membrane fuel cells. However, their electrochemical stability needs to be further explored for successful application in commercial fuel cells. Here we employ identical location scanning transmission electron microscopy to track the morphological and compositional changes of Rh@Pt/C NPs during potential cycling (10 000 cycles, 0.06–0.8 VRHE, 0.5 H2SO4) down to the atomic level, which are then used for understanding the current evolution occurring during the potential cycles. Our results reveal a high stability of the Rh@Pt/C system and point toward particle detachment from the carbon support as the main degradation mechanism., Peer reviewed

Animated movie with segmented low-resolution tomographic reconstruction of Rh@Pt/C NPs at 1000 potential cycles., Rhodium–platinum core–shell nanoparticles on a carbon support (Rh@Pt/C NPs) are promising candidates as anode catalysts for polymer electrolyte membrane fuel cells. However, their electrochemical stability needs to be further explored for successful application in commercial fuel cells. Here we employ identical location scanning transmission electron microscopy to track the morphological and compositional changes of Rh@Pt/C NPs during potential cycling (10 000 cycles, 0.06–0.8 VRHE, 0.5 H2SO4) down to the atomic level, which are then used for understanding the current evolution occurring during the potential cycles. Our results reveal a high stability of the Rh@Pt/C system and point toward particle detachment from the carbon support as the main degradation mechanism., Peer reviewed