• Current Photovoltaic Research
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• 제7권3호
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• pp.76-84
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• 2019

Silicon heterojunction solar cells (SHJ) have dominated the photovoltaic market up till now but their conversion performance is practically limited to around 26% compared with the theoretical efficiency limit of 29.4%. A silicon based multi-junction devices are expected to overcome this limitation. In this report, we briefly review the state-of-art characteristic of wide-gap materials which has played a role as top sub-cells in silicon based multi-junction solar cells. In addition, we indicate significantly practical challenges and key issues of these multi-junction combination. Finally, we focus to some characteristics of III-V/c-Si tandem configuration which are reaching highly record performance in multi-junction silicon solar cells.

• 진공이야기
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• 제1권4호
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• pp.4-9
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• 2014

About 170 years has been passed since the concept of photovoltaic has been suggested by French physicist Alexandre-Edmond Becquerel. Now the highest efficiency of solar cell has reached up to 44% by III-V multi-junction solar cells with concentrator. Those multi-junction solar cells are suitable as energy source for spaceships. On the other hand, the cell efficiency of solar cell for electric power generation as energy source for Earth has is going to be saturated although commercial solar cell efficiency is around 20%. In the part 1 of this article, the history of III-V multi-junction solar cells which have been adapted for spaceships is explained and in the part 2, new approach for the improvement of cell efficiency is suggested as the energy source for Earth.

• 한국진공학회지
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• 제22권3호
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• pp.150-155
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• 2013

태양전지의 표면에 텍스쳐 구조를 형성하면 빛의 반사율을 줄일 수 있으므로 태양전지의 효율을 증가시킬 수 있다. 또한 표면의 텍스쳐 구조는 넓은 파장대역에서 빛의 반사를 줄여주기 때문에 다중접합 III-V화합물 태양전지에 아주 유용하다. 본 연구에서는 얇은 Pt층을 식각 마스크로 사용하여 다중접합 III-V태양전지의 window층으로 사용되는 InAlP층에 다양한 텍스쳐 구조를 형성하고 반사율을 측정하였다. 습식식각에 의해 나노미터 크기로 형성된 피라미드 꼴 텍스쳐 구조는 $0.3{\sim}1.5{\mu}m$의 넓은 파장영역에서 빛의 반사율을 13.7%까지 감소시켰다.