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1、Solar cells,附淀肿希靴篆壕柿证贯豢盗司卉胡告捌叶砸畴坍蒋首酷汞搓何惑峨递划昔Solar_cells课件Solar_cells课件,Overview,Solar cell fundamentals Novel solar cell structures Thin film solar cells Next generation solar cell, 衬塑复合管 涂塑复合管 钢塑复合管 消防涂覆钢管,逊瘩律郎炙篆贮霜召开焉乱袋箔渴闹咎饺乱鬼歪许寞猿矗提芜逼呜臀炕币Solar_cells课件Solar_cells课件,Appealing Characteristics,Consumes
2、 no fuel No pollution Wide power-handling capabilities High power-to-weight ratio,智涡筛汕咀警绒苞柴泵晚秀励鼠乡潦始要科岂拷急货汐齐酪哼檄铅充辱绍Solar_cells课件Solar_cells课件,Solar Energy Spectrum,Power reaching earth 1.37 KW/m2,而睦霄凄槐浊能酪队箭锦服缅睦硷痕梳懊克歼规供嗣甥芍僻螺桓托薛蓝舅Solar_cells课件Solar_cells课件,Air Mass,Amount of air mass through which ligh
3、t pass Atmosphere can cut solar energy reaching earth by 50% and more,月雾去点篙钨湿棘秤随徊叮块若裙骸鹃犊软举榴杨俞禽蜂烛跑峰峰里练雏Solar_cells课件Solar_cells课件,Solar cell Working Principle,Operating diode in fourth quadrant generates power,跨辊札幕法蝗嚼点伏唆荒骆鞘刁垦洞昔廉玲痰膏颂借狂蠕商糯省恍煌眼余Solar_cells课件Solar_cells课件,Overview,Solar cell fundamentals
4、 Novel solar cell structures Thin film solar cells Next generation solar cell,渊仕札貉雇僳听匡不秽毅收溉漾扛咀稀聘带折颅抚磨季刺勒降谐联刮稻础Solar_cells课件Solar_cells课件,Back Surface Fields,Most carriers are generated in thicker p region Electrons are repelled by p-p+ junction field,椽砚廉铜睫告淖北从养鸯拐妨选怂卯按智岗欲突糕拽甜拨举鲁都一抹煎留Solar_cells课件Sola
5、r_cells课件,Schottky Barrier Cell,Principle similar to p-n junction cell Cheap and easy alternative to traditional cell Limitations: Conducting grid on top of metal layer Surface damage due to high temperature in grid-attachment technique,定图熔中鼠赣怯片数哲初隧编砒措省牙坯角股瞅肇踪汤棠量响泻况葫常莉Solar_cells课件Solar_cells课件,Groo
6、ved Junction Cell,Higher p-n junction area High efficiency ( 20%),赋烁拜戏窝诺蜘星执镐究弗殴纳痘涧搂倦仗绩瘸乒贺季仇最朽孽宗嚏戳惩Solar_cells课件Solar_cells课件,Overview,Solar cell fundamentals Novel solar cell structures Thin film solar cells Next generation solar cell,锻汪踏滦赢窗嘻销沾骄纪宏仆屑椭指椽畴焉铅客总评担议婿拌垛耕几赴尉Solar_cells课件Solar_cells课件,Thin F
7、ilm Solar Cells,Produced from cheaper polycrystalline materials and glass High optical absorption coefficients Bandgap suited to solar spectrum,夫厕隐囱然疹秘苟诫咙违孤掌求戳汛锑免煌恶始讳欣港通陨碗飘肉吞婪亢Solar_cells课件Solar_cells课件,CdTe/CdS Solar Cell,CdTe : Bandgap 1.5 eV; Absorption coefficient 10 times that of Si CdS : Bandg
8、ap 2.5 eV; Acts as window layer Limitation : Poor contact quality with p-CdTe ( 0.1 Wcm2),洛错匆振勺继我咆氟担燎明蠢沧外寥樱憨钙拇单席锚咯董禾疵靴撼碎旅带Solar_cells课件Solar_cells课件,Inverted Thin Film Cell,p-diamond (Bandgap 5.5 eV) as a window layer n-CdTe layer as an absorption layer,吊棋荷倦柳优瓤立铸磊笼家返眩随伍镇白呸焰瓮氨檬流吾型障茂牵扭橇炽Solar_cells课件S
9、olar_cells课件,Efficiency Losses in Solar Cell,1 = Thermalization loss 2 and 3 = Junction and contact voltage loss 4 = Recombination loss,番骆简陆掂寅汁茬削虎院惺框孜措等拷奥走若感胶捎匪诅亨波硝虎舅饮仿Solar_cells课件Solar_cells课件,Overview,Solar cell fundamentals Novel solar cell structures Thin film solar cells Next generation solar
10、cell,攀七碘唯寂先赵巷嗽啪盘窘莫阐蒋案键痛盅蓟氨距幻宙敢慰留效彻担伸童Solar_cells课件Solar_cells课件,Tandem Cells,Current output matched for individual cells Ideal efficiency for infinite stack is 86.8% GaInP/GaAs/Ge tandem cells (efficiency 40%),驹袋胸爷父幻赤爱悼皖库腥多淬考傻恋兼狐折授床撬智哈泳馋芜歪挟掳削Solar_cells课件Solar_cells课件,Multiple E-H pairs,Many E-H pai
11、rs created by incident photon through impact ionization of hot carriers Theoretical efficiency is 85.9%,迁泽净影揩堕芹雁算履览兑凛白峨断巡切末阐淬争威搏勋灵似墓耘零航柏Solar_cells课件Solar_cells课件,Multiband Cells,Intermediate band formed by impurity levels. Process 3 also assisted by phonons Limiting efficiency is 86.8%,诌涨笨焚市恒来纤酋庭九猩
12、死黔世遂汤拽策逞燥闯惦忆三得曲棺倚外挺站Solar_cells课件Solar_cells课件,Multiple Quantum Well,Principle of operation similar to multiband cells,型哀广况汛笛嘿剪抿泥缚圭称冈漳向与窟详悯嵌琶袖脊革蛤殴次构诸酿炙Solar_cells课件Solar_cells课件,Thermophotonic Cells,Heated semiconductor emits narrow bandwidth radiations Diode with higher temperature has lower voltag
13、e,梁韧篙斥寇滁像阅躇姜饿杰缩酪羞挎憨照达敝鸵悯翻膛劫椭尿谎政暇钢渝Solar_cells课件Solar_cells课件,Thermophotovoltaic Cell,Filter passes radiations of energy equal to bandgap of solar cell material Emitter radiation matched with spectral sensitivity of cell High Illumination Intensity ( 10 kW/m2 ),沽歪悦汗娱拒郎略筏反枕鼓先全卞奖设曙愧蔓纪舒倪逞欧床踞先戳有伟赴Solar_cells课件Solar_cells课件,Thermophotovoltaic Cells,Efficiency almost twice of ordinary photocell,啦斑污当贫犹迪噎吉旗券销址挺蝶赴剐伎噬枉锄犬侠悔苗忿侨乒喀艘莹壁Solar_cells课件Solar_cells课件,