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Investigators at South Dakota State University and the Florida Solar Energy Center installed a high-speed datalogger on a high-voltage PV series string as part of an experiment to quantify lightning-induced transients in PV arrays. However, during the measurement period, an unexpected result was observed: large voltage spikes appeared at the PV array terminals during the inverter's morning start-up...
It is known that nearby lightning strikes can induce overvoltages in photovoltaic arrays. However, although many laboratory studies have been reported, relatively few field studies have appeared in the literature. This paper reports on a field study conducted at South Dakota State University and the Florida Solar Energy Center in which a high-speed datalogger was used to monitor the voltage at the...
Since the bandgap of metamorphic GaAsP can be tuned through a range of energies in a high-radiance region of the solar spectrum, this alloy may be useful in multi-junction solar cells. For this application, achieving high conversion efficiency will require a good understanding of the defects that accompany lattice-mismatch in this system. We use photoluminescence and deep-level transient spectroscopy...
Here we present transient absorption studies of a common conjugated polymer component used in organic solar cells, P3HT, which suggests that at least partly, light absorption in the polymer layer leads to the direct formation of free charges much like that in silicon. The mechanism for free charge formation in P3HT shall be discussed along with a comparison of P3HT with traditional silicon devices...
We examine the status and question of long-term stability of copper indium diselenide (CIS) photovoltaic (PV) module performance for numerous modules that are deployed in the array field, or on the roof of, the outdoor test facility (OTF) at NREL, acquired from two manufacturers. Performance is characterized with current-voltage (I–V) measurements obtained either at standard test conditions (STC)...
This paper presents the results of a literature search and utility engineer survey on the subject of system-level impacts of high penetration levels of photovoltaics, undertaken by the authors as part of the Department of Energy's Renewable Systems Integration (RSI) project in 2007. The primary concerns associated with high PV penetration as described by the body of literature and by currently-practicing...
Nanostructured TiO2 thin films have been fabricated by glancing angle deposition (GLAD), and utilized as the electron acceptor in TiO2/polythiophene hybrid devices. TiO2 films were deposited on ITO coated glass by e-beam evaporation and were composed of a dense blocking layer (40 nm thick), and a columnar layer with a slanted post structure (400 nm thick). The slanted post layer was deposited using...
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