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Organic Solar Cells Research Prospects Reference Introduction Physics of Organic Solar Cells Research Prospects Reference Organic Solar Cells Rahul Dewan Organic Electronics Course Presentation International University Bremen 4th May 2006 Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Research Prospects Reference Outline 1 Introduction Solar Cells Organic Solar Cells 2 Physics of Organic Solar Cells Structure Working principle 3 Research Prospects Comparison Improving efficiency 4 Reference Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference History of Solar Cell Started with French scientist Edmond Becquerel’s photoelectric experiments in 1839. First solar cell using junctions was built by an American, Charles Fritts in 1883. (It was formed using coated selenium and gold, as a result, efficiency of only 1%) Albert Einstein publishes his paper on the photoelectric effect in 1905 for which he later receives the nobel prize. Energy efficient silicon solar cell finally built in 1941 by Russell Ohl. In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the silicon photovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable of converting enough of the sun’s into power to run everyday electrical equipments. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference History of Solar Cell Started with French scientist Edmond Becquerel’s photoelectric experiments in 1839. First solar cell using junctions was built by an American, Charles Fritts in 1883. (It was formed using coated selenium and gold, as a result, efficiency of only 1%) Albert Einstein publishes his paper on the photoelectric effect in 1905 for which he later receives the nobel prize. Energy efficient silicon solar cell finally built in 1941 by Russell Ohl. In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the silicon photovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable of converting enough of the sun’s into power to run everyday electrical equipments. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference History of Solar Cell Started with French scientist Edmond Becquerel’s photoelectric experiments in 1839. First solar cell using junctions was built by an American, Charles Fritts in 1883. (It was formed using coated selenium and gold, as a result, efficiency of only 1%) Albert Einstein publishes his paper on the photoelectric effect in 1905 for which he later receives the nobel prize. Energy efficient silicon solar cell finally built in 1941 by Russell Ohl. In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the silicon photovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable of converting enough of the sun’s into power to run everyday electrical equipments. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference History of Solar Cell Started with French scientist Edmond Becquerel’s photoelectric experiments in 1839. First solar cell using junctions was built by an American, Charles Fritts in 1883. (It was formed using coated selenium and gold, as a result, efficiency of only 1%) Albert Einstein publishes his paper on the photoelectric effect in 1905 for which he later receives the nobel prize. Energy efficient silicon solar cell finally built in 1941 by Russell Ohl. In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the silicon photovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable of converting enough of the sun’s into power to run everyday electrical equipments. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference History of Solar Cell Started with French scientist Edmond Becquerel’s photoelectric experiments in 1839. First solar cell using junctions was built by an American, Charles Fritts in 1883. (It was formed using coated selenium and gold, as a result, efficiency of only 1%) Albert Einstein publishes his paper on the photoelectric effect in 1905 for which he later receives the nobel prize. Energy efficient silicon solar cell finally built in 1941 by Russell Ohl. In the USA, Daryl Chapin, Calvin Fuller and Gerald Pearson develop the silicon photovolatic(PV) cell at Bell Labs in 1954. It was the first solar cell capable of converting enough of the sun’s into power to run everyday electrical equipments. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Schematics of p-n junction Solar Cell Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Operation of p-n junction Solar Cell The I-V characteristic of such a device is given by “ qV /kT ” I = Is e − 1 − IL (1) Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Operation of p-n junction Solar Cell Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Equations related to Solar Cell From equation (1), when I = 0, we obtain the open circuit voltage, VOC „ « „ « kT IL ∼ kT IL VOC = ln + 1 = ln (2) q IS q IS The maximum output power Pm is, » „ « – kT qVm kT Pm = ImVm =∼ I V − ln 1 + − (3) L OC q kT q Fill factor FF is given by, I V FF = m m (4) ILVOC And, the power conversion efficiency η FF.I V η = L OC (5) Pin Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Why Organic Solar Cells ? The discovery of metal-like electrical conductivity of polyacetylene in 1976 by Shirakawa with Heeger and MacDiarmid opened the field of research of polymers. Avdantages of organic solar cells ! Relatively cheap in production and purification. Materials can be tailored for the demand. Can be used on flexible substrate. Can be shaped or tinted to suit architectural applications. Disadvantages of solar cells! Do not reach the energy conversion efficiency exceeding 24 % in inorganic materials. Limited lifetime/ stability issue. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Why Organic Solar Cells ? The discovery of metal-like electrical conductivity of polyacetylene in 1976 by Shirakawa with Heeger and MacDiarmid opened the field of research of polymers. Avdantages of organic solar cells ! Relatively cheap in production and purification. Materials can be tailored for the demand. Can be used on flexible substrate. Can be shaped or tinted to suit architectural applications. Disadvantages of solar cells! Do not reach the energy conversion efficiency exceeding 24 % in inorganic materials. Limited lifetime/ stability issue. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Why Organic Solar Cells ? The discovery of metal-like electrical conductivity of polyacetylene in 1976 by Shirakawa with Heeger and MacDiarmid opened the field of research of polymers. Avdantages of organic solar cells ! Relatively cheap in production and purification. Materials can be tailored for the demand. Can be used on flexible substrate. Can be shaped or tinted to suit architectural applications. Disadvantages of solar cells! Do not reach the energy conversion efficiency exceeding 24 % in inorganic materials. Limited lifetime/ stability issue. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Why Organic Solar Cells ? The discovery of metal-like electrical conductivity of polyacetylene in 1976 by Shirakawa with Heeger and MacDiarmid opened the field of research of polymers. Avdantages of organic solar cells ! Relatively cheap in production and purification. Materials can be tailored for the demand. Can be used on flexible substrate. Can be shaped or tinted to suit architectural applications. Disadvantages of solar cells! Do not reach the energy conversion efficiency exceeding 24 % in inorganic materials. Limited lifetime/ stability issue. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Why Organic Solar Cells ? The discovery of metal-like electrical conductivity of polyacetylene in 1976 by Shirakawa with Heeger and MacDiarmid opened the field of research of polymers. Avdantages of organic solar cells ! Relatively cheap in production and purification. Materials can be tailored for the demand. Can be used on flexible substrate. Can be shaped or tinted to suit architectural applications. Disadvantages of solar cells! Do not reach the energy conversion efficiency exceeding 24 % in inorganic materials. Limited lifetime/ stability issue. Rahul Dewan Organic Solar Cells Introduction Physics of Organic Solar Cells Solar Cells Research Prospects Organic Solar Cells Reference Why Organic Solar Cells ? The discovery of metal-like electrical conductivity of polyacetylene in 1976 by Shirakawa with Heeger and MacDiarmid opened the field of research of polymers. Avdantages of organic solar cells ! Relatively cheap
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