01.01.2016
Concentrating photovoltaic (CPV) technology has recently gained interest based on its scalability and expected low levelized cost of electricity. Shibboleth is an access management service that provides single sign-on to protected resources. LOCTITE SI 5700 Transparent Potting SiliconeLOCTITE SI 5700 is an ultra clear, two part, polyaddition silicone designed for potting applications which cures at room temperature.
The reliability of encapsulation materials used in CPV systems, however, is not well established.
It replaces the multiple user names and passwords necessary to access subscription-based content with a single user name and password that can be entered once per session. To better define the stress inherent to CPV systems, the UV and infrared spectra transmitted through representative optical systems were evaluated.


If your institution uses Shibboleth authentication, please contact your site administrator to receive your user name and password. Measurements of optical components are used to assess expected optical performance and quantify damaging optical exposure. Kurtz"Analysis of transmitted optical spectrum enabling accelerated testing of multijunction concentrating photovoltaic designs", Opt. Optical properties (transmittance, refractive index, reflectance, and absorptance) of candidate materials (including PMMA, soda-lime glass, borosilicate glass, and quartz refractors), components (including Ag- and Al-enabled reflectors), and encapsulants (including EVA, ionomer, PDMS, PPMS, polyolefin, and PVB) were identified. The activation spectrum was calculated for the representative optical systems using an assumed action spectrum to compare the expected damaging dose of UV radiation delivered to the cell encapsulation. The dose and flux analysis identifies the significance of IR relative to UV exposure for CPV systems.


Because UV light is typically more highly attenuated, the UV dose within the encapsulation may not greatly exceed the unconcentrated global solar condition, but the thermal load scales nearly directly with the geometric concentration. Relative to a previous analysis for crystalline silicon cell technology, the analysis here is performed for III-V multijunction technology. Novel aspects here also include additional materials (such as TPU encapsulation) and additional components (transmission through silicone on glass lenses, antireflective coatings, and the front glass used with reflective systems, as well as reflection off of the cell).




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