Title page for etd-0715117-114241


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URN etd-0715117-114241
Author Yu-Yan Hu
Author's Email Address No Public.
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Department Electrical Engineering
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Both Side Collection on Emitter Wrap Through
Bifacial Solar Cell
Date of Defense 2017-07-27
Page Count 82
Keyword
  • both-side collection
  • carrier transport length
  • double-sided emitter
  • bifacial
  • Abstract We propose a symmetrical solar cell structure which has both emitters and Al-SFs in the both sides. They can enhance the effect of the both-side collection and increase the JSC. The comparison between the other cells also demonstrate the advantage of our new BSC-EWT (Both Side Collection on Emitter Wrap Through) solar cell. The both-sided emitter can lower carrier transport lengths in the base which suppress the recombination effect. The both-side collection allow to employ low lifetime material, such as p-type Si or mc-Si, which can achieve high efficiency and low cost at the same time. By using the TCAD simulator with carefully calibration, we investigate the behavior of these cells. First, the EWT (Emitter Wrap Through) has double-sided emitters therefore the conversion efficiency improves 3.87 % compared with BC-BJ (Back contact and back junction), but it still needs to promote. When the both-side contacts are set up in the EWT, which is so-called BOSCO (Both Side Contact and Collection), the collection of minority carrier has been promoted perfectly and improves the efficiency for 2.06 % again compared to EWT. In order to further improve the FF by lower the series resistance, our new BSC-EWT has proposed double-sided emitters and Al-SFs structure that can reduce the current paths. Even if there is a small reduction of JSC to BSC-EWT, the increments of FF contribute the efficiency significantly compared with BOSCO. Finally, the BSC-EWT achieve highest efficiency of 22.92 %, which improved 12.5 % compared to that of the original BC-BJ. Moreover, the bifacial testing shows that our BSC-EWT with double-sided emitters and both-side contacts is beneficial for bifacial application.
    Advisory Committee
  • Chee-wee, Liu - chair
  • Kow-Ming, Chang - co-chair
  • Min-Hang, Weng - co-chair
  • Shui-Hsiang, Su - co-chair
  • Jyi-Tsong, Lin - advisor
  • Files
  • etd-0715117-114241.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2017-08-15

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