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organic_pv_notes [2007-06-13 09:40]
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organic_pv_notes [2013-10-21 10:02] (current)
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 Objectives/Goals Objectives/Goals
  
-The objective is to compare the performance of home made natural dye based organic photovoltaic +The objective is to compare the performance of home made natural dye based organic photovoltaic devices with commercial inorganic silicon based photovoltaic devices in sunlight and colored artificial light.
-devices with commercial inorganic silicon based photovoltaic devices in sunlight and colored artificial +
-light.+
  
  
 Method/materials Method/materials
-Chlorophyll and anthocyanin organic dyes extracted from citrus leaves, raspberries and blackberries were + 
-absorbed onto nano-crystalline titanium dioxide coated on conducting glass slides. Photovoltaic devices +Chlorophyll and anthocyanin organic dyes extracted from citrus leaves, raspberries and blackberries were absorbed onto nano-crystalline titanium dioxide coated on conducting glass slides. Photovoltaic devices were made with an iodide/triodode electrolyte separating a graphite coated conducting glass slide from the dye coated slides. The voltage and current characteristics were measured in sunlight and colored artificial lights and compared to those observed for commercial silicon based photovoltaic devices.
-were made with an iodide/triodode electrolyte separating a graphite coated conducting glass slide from the +
-dye coated slides. The voltage and current characteristics were measured in sunlight and colored artificial +
-lights and compared to those observed for commercial silicon based photovoltaic devices.+
  
  
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 The  HYPERLINK "http://en.wikipedia.org/wiki/Electrolysis" \o "Electrolysis" electrolysis of ethylene glycol solutions with a  HYPERLINK "http://en.wikipedia.org/wiki/Silver" \o "Silver" silver  HYPERLINK "http://en.wikipedia.org/wiki/Anode" \o "Anode" anode results in an  HYPERLINK "http://en.wikipedia.org/wiki/Exothermic_reaction" \o "Exothermic reaction" exothermic reaction. The  HYPERLINK "http://en.wikipedia.org/wiki/Apollo_1" \lAs oil prices hit a new all-time high and fossil fuels continue to increase global warming, the quest to find a suitable renewable energy source is becoming increasingly urgent. Yet wind power is unreliable, hydroelectric systems spoil natural landscapes and nuclear power has associated heath risks. In central Australia greater than 24MJ/m2 day of solar energy is received (fig 1) and attention is now being directed at how we can use it [1]. The  HYPERLINK "http://en.wikipedia.org/wiki/Electrolysis" \o "Electrolysis" electrolysis of ethylene glycol solutions with a  HYPERLINK "http://en.wikipedia.org/wiki/Silver" \o "Silver" silver  HYPERLINK "http://en.wikipedia.org/wiki/Anode" \o "Anode" anode results in an  HYPERLINK "http://en.wikipedia.org/wiki/Exothermic_reaction" \o "Exothermic reaction" exothermic reaction. The  HYPERLINK "http://en.wikipedia.org/wiki/Apollo_1" \lAs oil prices hit a new all-time high and fossil fuels continue to increase global warming, the quest to find a suitable renewable energy source is becoming increasingly urgent. Yet wind power is unreliable, hydroelectric systems spoil natural landscapes and nuclear power has associated heath risks. In central Australia greater than 24MJ/m2 day of solar energy is received (fig 1) and attention is now being directed at how we can use it [1].
 The basis for all photovoltaic devices is the separation of charge at an interface of two materials that have different conduction methods (Grätzel M., 2000). In conventional cells, this is between n- and p- type semiconductor: although reasonable efficiencies of over 30% have been achieved in the laboratory (Cotal et al., 2000), typically the conversion rate is around 15-20% (Bignozzi, et al., 2000, Zweibel, 1993, 1990). However the widespread use of silicon and compound semiconductor solar cells is impracticable due to their expensive and complex manufacturing process. Toxic chemicals are used during manufacture, and they show a decrease of approximately 20% in the conversion of incident photons to electrons over 20-60°C temperature range (Nazeeruddin et al., 1993). The basis for all photovoltaic devices is the separation of charge at an interface of two materials that have different conduction methods (Grätzel M., 2000). In conventional cells, this is between n- and p- type semiconductor: although reasonable efficiencies of over 30% have been achieved in the laboratory (Cotal et al., 2000), typically the conversion rate is around 15-20% (Bignozzi, et al., 2000, Zweibel, 1993, 1990). However the widespread use of silicon and compound semiconductor solar cells is impracticable due to their expensive and complex manufacturing process. Toxic chemicals are used during manufacture, and they show a decrease of approximately 20% in the conversion of incident photons to electrons over 20-60°C temperature range (Nazeeruddin et al., 1993).
-The dye-sensitised solar cell (DYSC) was developed by Gratzel and coworkers (O’Regan & Gratzel, 1991) and uses the principle of photosynthesis to generate power; the boundary in a DYSC is between a wide band gap semiconductor and electrolyte solution. In solid-state devices light absorption and charge movement both occur on the semiconductor, whereas the two functions are performed by different materials in the DYSC (Späth et al., 2003); this has opened up a new mechanism for capturing solar energy.+The dye-sensitised solar cell (DYSC) was developed by Gratzel and coworkers (O’Regan & Gratzel, 1991) and uses the principle of [[photosynthesis]] to generate power; the boundary in a DYSC is between a wide band gap semiconductor and electrolyte solution. In solid-state devices light absorption and charge movement both occur on the semiconductor, whereas the two functions are performed by different materials in the DYSC (Späth et al., 2003); this has opened up a new mechanism for capturing solar energy.
  
  
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