perc电池制程详解-尊龙凯时官网
2019-08-17 12:36
原理:一定浓度、一定温度条件下,碱溶液与硅片反应,各向异性腐蚀;
principle:etching silicon in anisotropic koh solution;
目的:去除表面损伤层,降低表面反射率;
purpose:saw damage remove and reduce surface reflection;
化学反应式(chemical equation):si 2koh h2o → k2sio3 2h2↑
绒面结构(surface structure)
原理:采用三氯氧磷(pocl3)液态源扩散方法,在硅片表面形成n型层;
principle:pocl3 liquid diffusion, forming n type si on surface;
目的:形成pn结(太阳电池核心单元);
purpose: forming pn junction;
化学反应式(chemical equation) :5pocl3→3pcl5 p2o5(high t)2p2o5 5si→5sio2 4p↓
原理:采用激光,在硅片表面形成局域重掺杂n型层;
principle:use laser to form heavy n type si (local) on surface;
目的:形成局域重掺杂n型层;
purpose: forming heavy n type si (local) on surface;
原理:实现硅片的单面腐蚀;
principle: single side etch of silicon wafer;
目的:pn结边缘隔离和背面抛光;
purpose: isolation of pn junction and polishing.
化学反应式(chemical equation) :si 4hno3 → sio2 4no2↑ 2h2o sio2 4hf → sif4↑ 2h2o sif4 2hf → h2sif6
原理:在表面生长sio2钝化膜;
principle:grow sio2 film on surface;
目的:提升开路电压,提升效率。
purpose: increase voc, improve efficiency.
化学反应式(chemical equation) :
si o2 → sio2
原理:pecvd沉积alox sinx薄膜;
principle: pecvd deposition of alox sinx thin film;
目的:制备背面钝化介质层;
purpose: rear side alox/sinx dielectric layer.
工艺流程(process flow):
pecvd/arc原理:pecvd沉积sinx减反射膜;
principle: pecvd deposition of anti-reflective coating;
目的:表面钝化和降低反射率;
purpose: surface passivation and reduce reflection.
原理:激光消融背面介质层;
principle: laser ablation of dielectric layer;
目的:形成局域背场接触,收集电流;
purpose:forming local bsf(back surface filed) to collect current.
丝网印刷&烧结(screen printing& co-firing):
perc电池需使用专用银铝浆料,使电池性能达到最优。
perc cell use special ag&al paste,for optimum of cell performance.
原理:
principle:
目的:降低光衰减;
purpose:decrease lid.