Concentrated and Organic Photovoltaics

Between 2004 and 2008, silicon supply constraints caused more than a dou­bling of raw material cost [14]. In an effort to further reduce production costs, PV manufacturers have tried to reduce the amount of costly semiconductor material used in the module. These initiatives have generated interest in con­centrated photovoltaics (CPVs).

CPVs use polymeric lenses and packaging components to focus incident light on encapsulated cells, thereby increasing collection efficiency over a smaller cell area. Concentrated photovoltaic modules constituted 125 peak kilowatts, 0.06% of U. S. PV exports, in 2005, and 27,527 peak kilowatts, 2.8% of U. S. PV exports, in 2008 [15]. This explosive growth is the outcome of increased competitiveness due to improvements in cell efficiency. CPV has the highest cell efficiency, ~28% relative to other technologies, such as


Подпись:Подпись:Подпись:Подпись:Подпись:Подпись:Подпись:image221FIGURE 6.5

Depiction of a lens, parabolic mirrors, and reflectors with corresponding tracking requirements.

single crystalline silicon (~25%) and thin-film technologies (~13% to 20%) (Figure 5.4).

PV concentrators use either lenses, mirrors, or a combination to magnify incident irradiance (Figure 6.5). The concentrator type is categorized based on geometric configuration, concentration factor, and tracking requirements.

Updated: August 22, 2015 — 8:06 pm