Effect of Deposition Conditions on the Properties of TCO Films He, Yongcai; Dong, Gangqiang; Cui, Ge ...
2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC),
2018-June
Conference Proceeding
The optical and electrical properties of indium metal oxide (IMO) films have been investigated under different deposition conditions for silicon heterojunction (SHJ) solar cell applications. By ...adjusting oxygen concentration in the sputtering gas, and increasing magnetic field strength of the cathode, we observed enhancements in photoelectric properties of the IMO film. A maximum Hall mobility of 49.1 cm 2 /V·s was reached with optimal transmittance. Furthermore, there was a 0.62 mA·cm -2 gain in short-circuit current (J SC ) with high performance IMO films, resulting in an increased conversion efficiency by 0.6%.
Polymers that extend covalently in two dimensions have attracted recent attention as a means of combining the mechanical strength and in-plane energy conduction of conventional two-dimensional (2D) ...materials with the low densities, synthetic processability, and organic composition of their one-dimensional counterparts. Efforts to date have proven successful in forms that do not allow full realization of these properties, such as polymerization at flat interfaces or fixation of monomers in immobilized lattices. A frequently employed synthetic approach is to introduce microscopic reversibility, at the cost of bond stability, to achieve 2D crystals after extensive error correction. Herein we demonstrate a synthetic route to 2D irreversible polycondensation directly in the solution phase, resulting in covalently bonded 2D polymer platelets that are chemically stable and highly processable. Further fabrication offers highly oriented, free-standing films which exhibit exceptional 2D elastic modulus and yield strength at 50.9 +- 15.0 GPa and 0.976 +- 0.113 GPa, respectively. Platelet alignment is evidenced by polarized photoluminescence centered at 580 and 680 nm from different dipole transitions. This new synthetic route provides opportunities for 2D polymers in applications ranging from composite structures to molecular sieving membranes.
In this work, we demonstrate the application of water vapor doped indium oxide, alloyed with transition metal element M (IMO), as highly transparent conductive oxide (TCO) films incorporated in ...bifacial silicon heterojunction (SHJ) solar cells. By adding water vapor and oxygen gas into sputtering gas mixture, both electrical and optical properties of IMO film can be improved significantly. IMO films are characterized by sheet resistivity, Hall mobility and carrier density, crystallinity, and spectral transmittance. Finally, we obtained a 0.64 mA/cm 2 gain in J SC with optimal water vapor doped IMO film on n-side of SHJ cell, resulting in a 0.31% increase in solar cell conversion efficiency.
As China's first X-ray astronomical satellite, the Hard X-ray Modulation Telescope (HXMT), which was dubbed as Insight-HXMT after the launch on June 15, 2017, is a wide-band (1-250 keV) ...slat-collimator-based X-ray astronomy satellite with the capability of all-sky monitoring in 0.2-3 MeV. It was designed to perform pointing, scanning and gamma-ray burst (GRB) observations and, based on the Direct Demodulation Method (DDM), the image of the scanned sky region can be reconstructed. Here we give an overview of the mission and its progresses, including payload, core sciences, ground calibration/facility, ground segment, data archive, software, in-orbit performance, calibration, background model, observations and some preliminary results.
Finding the electromagnetic (EM) counterpart of binary compact star merger, especially the binary neutron star (BNS) merger, is critically important for gravitational wave (GW) astronomy, cosmology ...and fundamental physics. On Aug. 17, 2017, Advanced LIGO and \textit{Fermi}/GBM independently triggered the first BNS merger, GW170817, and its high energy EM counterpart, GRB 170817A, respectively, resulting in a global observation campaign covering gamma-ray, X-ray, UV, optical, IR, radio as well as neutrinos. The High Energy X-ray telescope (HE) onboard \textit{Insight}-HXMT (Hard X-ray Modulation Telescope) is the unique high-energy gamma-ray telescope that monitored the entire GW localization area and especially the optical counterpart (SSS17a/AT2017gfo) with very large collection area (\(\sim\)1000 cm\(^2\)) and microsecond time resolution in 0.2-5 MeV. In addition, \textit{Insight}-HXMT quickly implemented a Target of Opportunity (ToO) observation to scan the GW localization area for potential X-ray emission from the GW source. Although it did not detect any significant high energy (0.2-5 MeV) radiation from GW170817, its observation helped to confirm the unexpected weak and soft nature of GRB 170817A. Meanwhile, \textit{Insight}-HXMT/HE provides one of the most stringent constraints (~10\(^{-7}\) to 10\(^{-6}\) erg/cm\(^2\)/s) for both GRB170817A and any other possible precursor or extended emissions in 0.2-5 MeV, which help us to better understand the properties of EM radiation from this BNS merger. Therefore the observation of \textit{Insight}-HXMT constitutes an important chapter in the full context of multi-wavelength and multi-messenger observation of this historical GW event.
