Renewable Energy, Vol.80, 80-84, 2015
c-Si solar cells formed from spin-on phosphoric acid and boric acid
This paper reports the fabrication of c-Si based solar cells using spin-on dopants. Solar cells were developed by texturing both surfaces of the c-Si, and forming the p-n junction by spin-coating the n-type dopant followed by rapid thermal processing (RTP). For back surface field formation on the rear side, a similar spin-coating step was undertaken for one cell and e-beam Al deposition for the other. In the case of double-sided spin-coated cell, simultaneous p-n junction and back surface field were formed in one RTP cycle. Without using high performance features in the device, double-sided spin-on doped cell showed V-oc of 600 +/- 0.01 mV, J(sc) of 33.1 +/- 0.03 mA/cm(2), FF of 74.26 +/- 0.06% and efficiency of 14.74%. As compared to single-sided spin-on doped cell, an improvement in efficiency of about 1.3% has been obtained which can be attributed to boron back surface field. Double-sided spin-on process significantly reduces thermal budget and improves throughput Besides texturization, high efficiency features have not been used in the device. The results clearly demonstrate that c-Si based solar cells are potentially cost effective to manufacture. (C) 2015 Elsevier Ltd. All rights reserved.
Keywords:Low cost c-Si solar cell;Spin-on doped process;External quantum efficiency;Solar cell characterization;Boron back surface field;Texturization