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實驗七 太陽能電池 Solar cell efficiency measurement

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Presentation on theme: "實驗七 太陽能電池 Solar cell efficiency measurement"— Presentation transcript:

1 實驗七 太陽能電池 Solar cell efficiency measurement
半導體專題實驗 實驗七 太陽能電池 Solar cell efficiency measurement

2 Humanity’s Top Ten Problems for Next 50 years
ENERGY WATER FOOD ENVIRONMENT POVERTY TERRORISM & WAR DISEASE EDUCATION DEMOCRACY POPULATION Oil Natural gas Coal Uranium 41 yrs 67 yrs 192 yrs 53 yrs Source: Richard Smalley, Rice University

3 Prediction of Energy Demand from 2000 to 2100
(EJ/a:1018Joul/year) Source: German Advisory Council on Global Change, 2003

4 Spectral Irradiance(Wm-2m-1)
何謂AM0、AM1、AM1.5? AM 即 Air Mass,定義為穿過幾個大氣層厚度之太陽光 (Air Mass ~ sec  ,不同 Air Mass 亦代表不同的太陽光光譜) AM0 (於外太空,不穿過的大氣層) ~ 1,400 W/m2 AM1 (sec  = 1   ~0o ) ~ 1,000 W/m2 AM1.5 (sec  =1.5   ~45o ) ~ 844 W/m2 AM1.5 1,000 W/m2 (IEC 891、 IEC 非自然光源) 地球 AM0 AM1  AM1.5( ~45o ) 大氣層 Wavelength (m) Spectral Irradiance(Wm-2m-1) AM0 AM1.5

5 Solar Spectral Irradiance ASTM G173-03 Reference Spectra Derived from SMARTS v. 2.9.2
(垂直分量)

6 不同太陽電池材料對應太陽光譜波長圖

7 P-n junction

8 P-n junction

9 太陽電池之 I-V 特性 Voc:開路電壓(V) Isc:短路電流(A) Pmp:最大輸出功率(W) Vmp:最大輸出功率時之電壓(V)
Imp Isc Pmp Voc:開路電壓(V) Isc:短路電流(A) Pmp:最大輸出功率(W) Vmp:最大輸出功率時之電壓(V) Imp:最大輸出功率時之電流(A) Fill Factor (F.F.) = (Vmp  Imp / Voc  Isc)  100% 太陽電池效率 (Efficiency) = (Pmp / 輸入日照功率)  100% *輸入日照功率(W) = 太陽電池面積(m2) 日照強度(W/m2) *日照強度為 1,000 W/ m2 之最大輸出功率即為 Wp *太陽電池開路、短路時皆不會燒毀 輸出功率

10 Industrial cell ARC:antireflection coating
Inverted pyramid textured surface substantially reduces reflection losses and increases absorption probability in the device. ARC:antireflection coating

11

12 不同日照量下太陽電池 I-V 特性曲線 Isc = - IL  入射光強度
1 2 3 4 5 6 7 Current (A) Voltage (V) 500W/m2 1,000W/m2 250W/m2 750W/m2 0.1 0.2 0.3 0.4 0.5 0.6 晶矽太陽電池: Voc~0.6V Vmp~0.5V Isc = - IL  入射光強度 Voc = aVT ln(IL/ I0 + 1)  ln (入射光強度) ,與材料特性有關 Voc 不隨日照量劇烈變化為太陽電池容易使用之重要原因

13 不同溫度下太陽電池 I-V 特性曲線 太陽電池溫度升高時輸出電壓與最大輸出功率將降低!
75oC 50oC 25oC 0oC 7 6 1,000W/m2 5 Current (A) 4 3 2 1 0.1 0.2 0.3 0.4 0.5 0.6 Voltage (V) 太陽電池溫度升高時輸出電壓與最大輸出功率將降低! 此特性與太陽電池材料特性有關,是太陽電池應用上最大問題!

14 Absorption 300 K

15 Analytic model

16 結報問題 Voc(V) Jsc(mA/cm2) FF(%) Eff(%) C-Si(n) 0.627 33.98 81.42 17.36
IV curve, Find Jsc、Voc、FF、Eff 1度電多少元


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