有关太阳能电池的英文PPt.ppt

1、Solar cells 太阳能电池,报告人：杜龙欢 制作小组：仇浩明、陈燕鑫、戴兴宏、刘飞龙、杜龙欢,Where can Solar cells be used in our life？,What is solar cells working principle?,Questions,Solar energy is a radiant energy, which can be converted into electrical energy by means of energy converter. The energy converter accomplishing the conversi

2、on of light energy into electrical energy is called the solar cell. Solar power in two ways, one is light - heat - electricity conversion mode, the other is light - electric direct conversion .Photovoltaic solar cells to work in crystal solar cells and thin film solar cells for the mainstream, but t

3、o work wet photochemical effects of solar cells is still in its infancy,Working principle,The working principle of solar cells based on semiconductor PN junction of the photovoltaic effect. The so-called photovoltaic effect is when the object is affected by light, the charge distribution within the

4、state of the object changes the voltage and current caused by an effect. To understand the operation of solar cells do, we need to consider the material properties and taking into account the properties of sunlight. Two types of materials which can be made into solar cells, are in the usual sense of

5、 the P-type silicon and N-type silicon. In the pure silicon crystal, the number of free electrons and holes are equal. If the silicon crystal is doped with boron, aluminum, gallium, indium or other impurities which can capture electrons, then it constitutes a P-type semiconductor. If the silicon sur

6、face to release electrons by mixing phosphorus, arsenic, antimony and other impurities, then it constitutes the N-type semiconductor. If the combination of these two semiconductors, due to the spread of electrons and holes in the transfer would be to form a PN junction surface and in the end both si

7、des of the formation of built-in electric field.,Sun light shine over the emiconductor pn junction, producing a new hole - electron pairs . Then,under the effect of electric field in the pn junction, the hole flow from the n zone area to p zone area, and the electronic from the p area to n area. Aft

8、er the photogenic charge carrier is connected to the circuit , the current will formated. This is the photoelectric effect, is also a solar cells working principle. Therefore, if form a loop circuit (circuit showed as Figure 3.1) , the energy generated from the battery in the following lighting circ

9、uit , for free electrons haveing to go along the loop back to the positive pole.,Figure 3.1 The photoelectric effect of solar cells,How much energy can get from a photoelectric device depending on the following factors:1, the size and type of material2, the intensity of sunlight3, the wavelength of

10、sunlight Solar cell characteristics:1, a much longer life span compared to human history, so it is almost limitless energy;2, solar energy is extremely rich, 30-minute exposure to the Earths energy is enough for annual energy consumption of the world; 3, solar energy is green energy, which will not

11、cause any pollution;,Applications,At present, the photovoltaic power generation products for several major areas:1, Provides power for the radio forum, mainly for the majority of residents living without electricity production of electricity, there are microwave relay power supply, communication pow

12、er supply, etc. In addition, including some mobile power supply and backup power;2, Solar household electronic products, such as various types of solar chargers, solar lights and solar lawn lights, etc.;3 Combined to the grid.It has been promoted to implement in large area in the developed countries

13、;4,For Aerospace. . Today, solar cells power virtually all satellites, including those used for communications, defense, and scientific research.,Thanks,infancy/nfnsi/ noun （uncountable） 1、the time when a child is a baby or very young 婴儿期；幼儿期 2、the early development of something 初期；初创期 in ones infan

14、cy 在初期;在早期阶段,RETURN,dope dup noun 1、dope is a drug, usually an illegal drug such as marijuana or cocaine.麻药;毒品 2、if someone dopes a person or animal or dopes their food, they put drugs into their food or force them to take drugs.给(自己或别人)服麻药;在.中搀麻药 3、if someone calls a person a dope, they think that

15、the person is stupid.笨蛋;无生气的人 4、在.中搀添加剂 doped with boron, aluminum, gallium, indium 掺杂硼、铝、镓、铟等元素,RETURN,boron, brn硼 aluminum, ljuminm铝， gallium, /lim/ 镓 ， indium. indim铟 phosphorus/fsfrs/ 磷 arsenic, :snk n.1.砷 2.三氧化二砷,砒霜; adj. 1.砷的;含砷(主要指五价砷)的 antimony ntimni n. 1.锑,RETURN,Junction /dnkn / n 1.联结点,

16、会合点, 枢纽 2.（公路或铁路的）交叉路口，汇合处，枢纽站 3.（电缆等的）主结点，接头 Example: Theres a bridge at the junction of the two rivers. 两河的汇合处有座桥。,RETURN,forum f:rm n. 1.集会的公共场所 2.论坛, 讨论会, 专题讨论节目 3.法庭 4.【计算机、网络】论坛 Example: Yesterday we visited the forum of ancient Romans. 昨天我们参观了古罗马的公共集会广场。 Theyre holding a forum on new ways of teaching history. 他们正在举行历史教