太阳能英语演讲PPT.ppt

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1、Solar EnergySolar EnergyOutlineOutlineBackgroundBackgroundApplicationApplicationPrinciplePrincipleUtilizationUtilizationAutomatic solar tracking deviceAutomatic solar tracking deviceOutlookOutlookBackgroundBackgroundnuclar powercoal oil Advantage:Utilization is high,can be used for most of our life

2、and make Social progressDisadvantage:Nonrenewable,Pollution of the environment Monopoly,LimitedNatural gasThe time that energy can be used:The time that energy can be used:Oil:42 YOil:42 YNatural gasNatural gas:67 Y:67 YCoal:200 YCoal:200 YThree Three thousand thousand years years ago ago,humans hum

3、ans began began to to use use solar solar energyenergy IndirectlyIndirectly.Human Human have have used used solar solar energy energy as as energy energy and and motion motion for for 300 300 years.years.Modern Modern history history of of solar solar energy energy from from the the 1615 1615 French

4、 French engineer engineer Salomon Salomon de de Cox Cox invented invented the the first first solar-driven solar-driven motives motives counting in the world counting in the world Plants absorb solar Animals eat plants Humans hunted animalsSalomon de Cox French French scientist scientist Henri Henri

5、 Becquerel Becquerel discovered discovered photovoltaic photovoltaic effecteffectin 1893.in 1893.1930 1930 Schottky Schottky discovered discovered photovoltaic photovoltaic effecteffectof of BarrierBarrier and and in in this this year year,he,he makmakeded a a solar solar cellcell based based on on

6、photovoltaic photovoltaic effect effect 1941 Orr discovered the photovoltaic effect in silicon1941 Orr discovered the photovoltaic effect in siliconIn In 1954,1954,the the first first monocrystalline monocrystalline solar solar cellcell was was createcreated d and and itsits efficiency efficiency is

7、is 6%6%The advantage of Solar Energy:The advantage of Solar Energy:1:Renewable 1:Renewable 2:Environmental 2:Environmental 3:Non-monopoly 3:Non-monopolyApplicationApplicationsolar mobile phonesolar carsolar panelsSolar water heatersSolar motorPrinciplePrincipleThe light that solar cells can absorbTh

8、e light that solar cells can absorbphotovoltaic effectphotovoltaic effectUtilizationUtilizationIn In 1954,1954,the the first first monocrystalline monocrystalline solar solar cellcell was was createcreated d and and itsits efficiency efficiency isis 6%6%But today:But today:Business:Business:Polysili

9、con(Polysilicon(多多晶晶硅硅):):14-16%14-16%monocrystalline(monocrystalline(单单晶晶硅硅):15-18%):15-18%Civil:SiCivil:Si(非晶硅非晶硅):6-10%:6-10%Conversion factorsConversion factors 1:Light intensity 1:Light intensity 2:Material 2:Material 3:Technological level 3:Technological level*How to improve the conversion rat

10、e of solar cells*How to improve the conversion rate of solar cells 1:Reduce losses in the light areas 1:Reduce losses in the light areas (Bare silicon surface reflection ratio of 36%!)(Bare silicon surface reflection ratio of 36%!)Optimizing the surface to reduce reflection Optimizing the surface to

11、 reduce reflection 2:Reduce losses in electrical terms 2:Reduce losses in electrical terms Ideal P-N junction technology Ideal P-N junction technology 3:New materials or technology 3:New materials or technology Finding Finding or or creating creating materials materials or or technology technology to to make make the the conversion rate of solar cell higherconversion rate of solar cell higher Automatic solar tracking deviceAutomatic solar tracking deviceSchematicSchematicOutlookOutlook