25 research outputs found
The annual energy yield of mono- and bifacial silicon heterojunction solar modules with high-index dielectric nanodisk arrays as anti-reflective and light trapping structures
While various nanophotonic structures applicable to relatively thin
crystalline silicon-based solar cells were proposed to ensure effective light
in-coupling and light trapping in the absorber, it is of great importance to
evaluate their performance on the solar module level under realistic
irradiation conditions. Here, we analyze the annual energy yield of relatively
thin heterojunction (HJT) solar module architectures when optimized
anti-reflective and light trapping titanium dioxide (TiO) nanodisk square
arrays are applied on the front and rear cell interfaces. Our numerical study
shows that upon reducing crystalline silicon (c-Si) wafer thickness, the
relative increase of the annual energy yield can go up to 11.0 %
and 43.0 % for mono- and bifacial solar modules, respectively,
when compared to the reference modules with flat optimized anti-reflective
coatings of HJT solar cells.Comment: 24 pages, 7 figure
Measurement of the recoil polarization in the p (\vec e, e' \vec p) pi^0 reaction at the \Delta(1232) resonance
The recoil proton polarization has been measured in the p (\vec e,e'\vec p)
pi^0 reaction in parallel kinematics around W = 1232 MeV, Q^2 = 0.121 (GeV/c)^2
and epsilon = 0.718 using the polarized c.w. electron beam of the Mainz
Microtron. Due to the spin precession in a magnetic spectrometer, all three
proton polarization components P_x/P_e = (-11.4 \pm 1.3 \pm 1.4) %, P_y =
(-43.1 \pm 1.3 \pm 2.2) %, and P_z/P_e = (56.2 \pm 1.5 \pm 2.6) % could be
measured simultaneously. The Coulomb quadrupole to magnetic dipole ratio CMR =
(-6.4\pm 0.7_{stat}\pm 0.8_{syst}) % was determined from P_x in the framework
of the Mainz Unitary Isobar Model. The consistency among the reduced
polarizations and the extraction of the ratio of longitudinal to transverse
response is discussed.Comment: 5 pages LaTeX, 1 table, 2 eps figure
Leptonic Production of Baryon Resonances
In these lectures, the author focuses on the electromagnetic transition between non-strange baryon states. This sector received much attention in the early 1970's after the development of the first dynamical quark models. However, experimental progress was slow, partly because of the low rates associated with electromagnetic interactions, and partly because of the lack of guidance by theoretical models that went beyond the simplest quark models. It was also difficult for experiments to achieve the precision needed for a detailed analysis of the entire resonance region in terms of the fundamental photocoupling amplitudes over a large range in momentum transfer