大規模太陽光発電システム - Fuji Electric...PCSは単機容量で1,000kWを実現しました。 大規模太陽光発電向けでは単機大容量化を実現した事で
太陽光電技術
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Transcript of 太陽光電技術
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太陽光電技術Week 1: Basic concepts
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光合作用
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再生能源種類• 風能• 太陽能• 水力• 地熱能• 氫能• 生化質能
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solar cell
Silicon矽
Crystalline晶矽
Single Crystalline單晶矽
Poly Crystalline多晶矽
Thin Film Poly多晶矽薄膜
Amorphous Thin Film
非晶矽薄膜
Compound化合物
Single Crystalline單晶
Poly Crystalline多晶
Organic cell有機材料
Dye-sensitized solar cell
染料敏化電池
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Type of cell Efficienciy (%) Characteristics
Silicon(矽 ) Crystalline (晶形矽 ) 24 high cost
Multicrystalline (多晶形矽 )
18 high cost
Amorphous (非晶形矽 )
13 medium cost,unstable
CuInSe2 (銅銦硒 ) 19 indium expensive
III-V semiconductors (GaAs, InP) (砷化鎵 )
25 High efficiency, high cost
II-VI (CdTe) (銻化鎘 ) 16
Dye-sensitized nanostructured Cells
10 low cost,scale up production
Bipolar AlGaAs/Si 20 high cost
Organic (有機 ) 3-5 low cost,low efficiency
太陽電池種類
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電磁波頻譜
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太陽光功率 =1500W/m2 ( 大氣上層 )
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Figure 2.9: Schematic of AM reference spectra condition
AM1.5G=1000 W/m2 ( 地球表面 )
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Figure 2.10: Examples of other realistic atmospheric and air mass conditions compared to AM 1.5
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Silicon 的能帶 (energy band)
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Principle of silicon solar cells
Valence – conduction bandTransition , one photon producesone e-h pairProblem: 電子電動因庫倫力吸引— Excition, 防害電子的收集P-N Junction
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Exciton 的觀念• bound Electron-hole pair 稱為 exciton
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A tightly bound exciton
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Exciton 之束縛能
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實際 Si 太陽電池之結構
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Antireflection coating 減少入射光之反射
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能量轉換效率 (energy conversion efficiency , η )
入射太陽光輻射之能量 ( Pin ) 與太陽能電池輸出功率 ( Pmax ) 的百分比標準光源 : AM 1.5 (0.1W/cm2)
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X 軸交會點 : 開路電壓 ( open circuit voltage , VOC )Y 軸交會點 : 短路電流 ( short circuit current , ISC )
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填充因子 FF ( fill factor )
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I-V量測示意圖
2400
圖 3-3-1.2 電腦量測示意圖
AM1.5 Filter
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IPCE ( Incident photon to current conversion efficiency )
λ : 單色光波長 J : DSSC 光電流密度 Pin : 單色光入射能量
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IPCE光譜量測架設圖
Keithley 2400
光纖
樣品座
圖 3-3-3 IPCE光譜量測架設圖
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染料對光波長的 IPCE
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Theory for Si solar cells: One-diode model
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Iph: 入射光產生之電流I0: 二極體飽和電流實際狀況 , 須考慮平行電阻與串聯電阻— Rparallel, Rseries,
2-diode model
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理想太陽電池之 I-V 曲線
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Rs, Rp 對 I-V 曲線之影響
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Series resistance 對 solar cell 電流之效應
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Rs 及 Rp 的簡單計算Rs =(dV/dI) at I=0
Rp =(dV/dI) at v =0
Rs-1
Rp-1