以自組裝鋪排微米球抗反射結構提升太陽能電池效率之研究

Efficiency Enhancement of Solar Cell by Self-Assembly Sub-Micron Structure Anti-Reflection Coating

林志倫(Chi-Luen Lin)

指導教授 ： 何文章

國立臺北科技大學/電資學院/光電工程系研究所/碩士(2010年)

摘要

本文中我們發展出一種利用自組裝(self-assembly)的二氧化矽微米球製作全方向性抗反射層(omni-direction anti-reflection coating)，去提升太陽光從不同入射角度時太陽能電池的效率。這種全方向性抗反射層是利用傾斜排水法(tilted-drain method)在矽太陽能電池表面上形成單層的微米球，部分浸泡在二氧化矽薄膜(spin on film;SOG)且厚度要低於球的半徑。
我們使用4μm 的微米球跟0.2 μm 的二氧化矽薄膜在矽基板上形成這種全方向性抗反射層，使波長在400-1100 nm 的反射率從35 %降到5 %。全方向性抗反射層在經過實驗後顯示出可增加矽太陽能電池光電流從2.10 mA 提升到2.98 mA，效率從3.84 %提升到4.64 %，相對效率提升達到20.8 %。此外，當入射光從0 度增加到45 度的時候，表面沒有任何抗反射層的矽太陽能電池，光電流從2.09 mA 下降到1.28 mA，效率從3.56 %下降到2.19 %，相對效率下降~38.5 %，而有全方向性抗反射層的矽太陽能電池光電流從2.98 mA 下降到2.44
mA，效率從4.64 %下降到3.80 %，相對效率只有下降18.1 %。
另外，我們將全方向性抗反射層應用在GaAs 太陽能電池上，經過量測後可提升GaAs 太陽能電池光電流從6.13 mA 提升到6.82 mA，光電流增加了11.26%，轉換效率從20.91%下降到17.92%，相對效率下降了14.30%。當入射光從0 度增加到45 度時，沒有製作全方向性抗反射層的電池光電流從6.13 mA下降到4.33 mA，效率從20.9 %下降到14.56 %，相對效率下降~30.3 %;有全方向性抗反射層的電池光電流從6.82mA 下降到5.46 mA，效率從17.9 %下降到13.84 %，相對效率下降只有下降22.68%。

關鍵字

表面粗化 ； 自組裝 ； 微米球 ； 全方向 ； 太陽能電池

並列摘要

In this paper we develop a way to use self-assembly of the silica microspheres produced omni-directional anti-reflection coating to enhance the solar cell efficiency
when the sunlight incident from a different angles. The silicon solar cell with omni-directional anti-reflection coating is used a tilted-drain method to form the single layer of microspheres on the surface and some soaked in silica film (SOG),which the thickness of the SOG film must be less than the radius of the microsphere.
We used 4μm diameter of microspheres with 0.2 μm thick of SOG film on silicon wafer to form the omni-directional anti-reflection, that can reduce the reflection from 35% to 5 % at the wavelength range of 400-1100 nm. The silicon solar cell without and with omni-directional AR coating show that the photocurrent is increased from 2.10 mA to 2.98 mA, the efficiency is enhanced from 3.84 % to 4.64
%, and the relative efficiency is increased of 20.8 %. In addition, when the lightincident from 0° increased to 45°, the photocurrent of the silicon solar cell without any anti-reflection coating decreased from 2.09 mA to 1.28 mA, efficiency decreased from 3.56 % to 2.19 %, and the relative efficiency decreased about 38.5 %.
But the silicon solar cell with omni-directional anti-reflection coating, the photocurrent decreased from 2.98 mA to 2.44 mA, efficiency decreased from 4.64 % to 3.80 %, and relative efficiency decreased only about 18.1 % were obtained.
Moreover, the GaAs solar cell without and with omni-directional AR coating show that the photocurrent is increased from 6.13 mA to 6.82 mA, the efficiency is
decreased from 20.91 % to 17.92 %, and the relative efficiency is decreased of 14.30 %. When the light incident from 0° increased to 45°, the photocurrent of the GaAs
solar cell without any anti-reflection coating decreased from 6.13 mA to 4.33 mA, the efficiency decreased from 20.91 % to 17.92 %, and the relative efficiency decreased about 30.3 % . However, the GaAs solar cell with omni-directional anti-reflection coating, the photocurrent decreased from 6.82 mA to 5.46 mA, efficiency decreased from 17.9 % to 13.84%, relative efficiency decreased only
about 22.68 %.

並列關鍵字

Texture ； Self-Assembly ； Microsphere ； Omni-Direction ； Solar Cell

參考文獻

[2]D. M Chapin and C. S. Fueller, “A new silicon p-n junction photocell for converting solar radiation into electrical power,” Journal of Applied Physics, Vol.

25, 1954, pp. 676-677

[4] J. Zhao, A. Wang, M. A. Green, “High-efficiency PERL and PERT silicon solar cells on FZ and MCZ substrates,” Solar Energy Materials & Solar Cells 65, 2001,pp. 429-435.

[6] D. Lee, M. F. Rubner, R. Cohen, “All-Nanoparticle Thin-Film Coatings,” Nano Letters, Vol. 6, No.10, 2006, pp. 2305-2312.

[7] D.Bouhafs, A. Moussi, A. Chikouche, J. M. Ruiz, “Design and simulation of antireflection coating systems for optoelectronic devices: Application to silicon