화학공학소재연구정보센터
Solar Energy Materials and Solar Cells, Vol.95, No.9, 2698-2700, 2011
Local aluminum-silicon contacts by layer selective laser ablation
We demonstrate damage free selective laser ablation of silicon nitride from a silicon nitride/amorphous silicon double layer. This approach allows local contact formation to passivated silicon. Thereby the remaining amorphous silicon dissolves in evaporated aluminum by annealing. This technique is especially useful for contacting thin emitters since it avoids any damage to the silicon substrate. We demonstrate a local contact resistivity of 0.8 +/- 0.3 m Omega cm(2) on a phosphorous diffused emitter with a peak doping density of 2 x 10(20) cm(-3). Laser treated as well as non-treated areas show the same carrier lifetime of 2000 mu s on 100 Omega cm mono-crystalline silicon, proving the selective ablation. (C) 2011 Elsevier B.V. All rights reserved.