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Policy Department A: Economic and Scientific Policy ____________________________________________________________________________________________ An open issue is the stability of organic solar cells. Experiments show that a degradation of less than 5% after 1,000 h of irradiation has been achieved [Mwaura 2008]. This would be less than one year of guaranteed lifetime if compared to today’s established PV technologies (many companies offer 20 years guaranteed power production with 5-10% power loss at maximum). The use of organic photovoltaics is mainly considered for consumer products. The target is to extend the lifetime above 5 years. For photovoltaic power stations a lifetime of at least 20 years is required [Mwaura 2008]. 1.2.7. Overview of various PV technologies An overview with details for all PV technologies is shown in Table 4. Table 4: Overview of varios PV technologies Technology Compo- sition Efficiency (Panel) Costs Environmental performance State-of- the-art [%] Potential [%] [€/Wp] Mono crystalline silicon (Si) Si 13-20 >20 ~2.70 [Photon 3/2009] <1 (target) Lifetime > 25 yr 2.0 yr (1700 kWh/(m2*yr)) [IEA 2007] Multi crystalline silicon (Si) Si 12-14 ~2.70 [Photon 3/2009] <1 (target) Lifetime > 25 yr 1.7 yr (1700 kWh/(m2*yr)) [IEA 2007] Edge-defined film-fed growth (EFG) silicon Si 12-13 <1 (target) Lifetime > 25 yr String Ribbon silicon Si 11-12 <1 (target) Low energy payback time, 1.5 yr (1700 kWh/(m2*yr)) [IEA 2007] Amorphous silicon Si 5-7 ~2.20 [Photon 3/2009] <1 (target) Lifetmie > 25 yr Low energy payback time < 2 yr [Schott 2009] Micro crystalline silicon/ Micromorph silicon Si 7-8 [Sontor] 9-10 [Kaneka] 8.5 [Inventux] >12 <1 (target) Lifetime > 25 yr [Kaneka 2009] NF3 emissions at production stage, can be avoided by using F2 Cadmium Tellurium CdTe 8-11 15% [Photon 5/2009] ~2.20 [Photon 3/2009] <1 (target) Lifetime > 25 yr [First Solar 1/2010] Low energy payback time; Limited tellurium (Te) resources; Danger of Cd release in case of fire IP/A/ITRE/ST/2009-11 & 12 12 PE 440.278PDF Image | Policy Department Renewable Technologies
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