Electroless plating of buried contact solar cell

전극함몰형 태양전지의 무전해도금

  • Dong Seop Kim (Photovoltaic Devices Lab, Materials & Devices Research Center, Samsung Advanced Institute of Technology, Suwon 440-600, Korea) ;
  • Eun Chel Cho (Photovoltaic Devices Lab, Materials & Devices Research Center, Samsung Advanced Institute of Technology, Suwon 440-600, Korea) ;
  • Soo Hong Lee (Photovoltaic Devices Lab, Materials & Devices Research Center, Samsung Advanced Institute of Technology, Suwon 440-600, Korea)
  • Published : 1996.03.01

Abstract

The metallization is the key to determining cell costs, cell performance, and system reliability. Screen printing technology suffers from several limitations affecting mainly the front grid. The buried contact solar cell (BCSC) was specifically desinged to be compatible with low cost, mass production techniques and avoid the conventional metallization problem. By using electroless plating technique, we performed this metallization inexpensively and reliably. This paper presents the details of the optimization procedure of metallization schemes on laser grooved cell surfaces. Commercially available Ni, Cu and Ag plating solutions were applied for the cell metallization. The application of those solutions on the buried contact front metallization has resulted in an cell efficiency of 18.8%. The cell parameters are an open circuit voltage of 651 mV, short circuit current density of 37.1 mA/$\textrm{cm}^2$, and fill factor of 77.8 %. The efficiency of over 18 % was achieved in the above 90% of the batch.

태양전지의 전극형성은 전지의 가격과 성능 그리고 시스댐의 신뢰성을 결정하는데 매우 중요한 변수이다. 기폰의 스크련 프린팅 기술은 전면전극에 냐쁜 영향을 미치는 여러가지 제약들을 가지고 었다. 전극함몰형 태양전지는 기존의 전극에서 발생하는 문제점을 극복하고 저가격 대량생산을 위해서 고안된 것이다. 본 논문에서는 무전해 도금방법을 사용하여 함몰형 전지의 전극을 형성하는 공정을 최적화함으로써 값싸고 재현성있게 전지를 제조할 수 있었다. 무전해 도금용액으로는 상엽적으로 사용되는 니켈, 구리, 은 용액을 사용하었으며, 전지의 효울 을 최고 18.8 %까지 얻었다. 이때 전지의 개방전압은 651 mV, 단락전류밀도는 37.1 mA/$\textrm{cm}^2$, 충실도는 77.8 % 었으며 배치에서 90 % 이상의 전지가 18 % 이상의 효율을 나타내었다.

Keywords

References

  1. Conf. Record, 15th IEEE PVSC Reliability of Silicon Solar Cells with a Plated Nickel-Copper Metallization System L.A. Grenon;N.G. Sakiotis;M.G. Coleman
  2. An All-Plated, Low Cost Contact System for Silicon Solar Cells D.P. Tanner;P.A. Iles;P. Alexander
  3. Progress in photovoltaics v.1 Buried Contact Silicon Solar Cells S.R. Wenham
  4. Silicon Solar Cells Advanced Principles & Practice M.A. Green, green
  5. Conf. Record 14th IEEE PVSC A Base Metal System for Silicon Solar Cells M.G. Coleman;R.A. Pryor;T.G. Sparks
  6. Conf. Record. 14th IEEE PVSC D.P. Tanner;P.A. Iles;P. Alexander
  7. J. Res. Nat'l. Bur. Stan. v.37 A. Brenner;G.E. Riddell
  8. Proc. Am. Electroplat. Soc. v.33 A. Brenner;G.E. Riddell
  9. Ph. D. Thesis, University of New South Wales Laser Grooved Silicon Solar Cell S.R. Wenham
  10. J. Electrochem. v.104 no.2 A.W. Goldenstein(et al.)