The influence of Ag-ion concentration on the performance of me-Si silicon solar cells textured by metal assisted chemical etching (MACE) method
The influence of Ag-ion concentration on the performance of me-Si silicon solar cells textured by metal assisted chemical etching (MACE) method
复制标题
银离子浓度对金属辅助化学刻蚀（MACE）法织构多晶硅太阳能电池性能的影响
DOI：
10.1016/j.solmat.2019.109983
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发表时间：
2019
影响因子：
6.9
通讯作者：
Tang Lei
中科院分区：
文献类型：
--
作者：
Zhang Pengfei;Jia Rui;Tao Ke;Jiang Shuai;Dai Xiaowan;Sun Hengchao;Jin Zhi;Ji Zhuoyu;Liu Xinyu;Zhao Chongyou;Liu Hongzhi;Zhao Yaopei;Tang Lei
随着金刚石线锯（DWS）多晶硅（mc-Si）技术成为硅基光伏产业的主流晶圆化技术，金属辅助化学刻蚀（MACE）技术将成为提高转换效率的关键技术。由于第一步腐蚀中Ag纳米颗粒在溶液中沉淀反应的固有特性，在后续的腐蚀步骤中，在mc-Si晶片表面产生了大量的深纳米孔。深的纳米孔会导致多晶硅太阳电池性能的下降。因此，银离子浓度的影响，在第一步的MACE太阳能电池的性能进行了仔细的研究。研究发现，随着银离子浓度的增加，光捕获能力不断提高。然而，当银离子浓度达到一定值时，太阳能电池的电性能急剧恶化。通过光学和电学模拟解释了深纳米孔对多晶硅太阳电池性能的影响。发现存在一个最佳的银离子浓度值，在156.75 × 156.75mm ~ 2的大尺寸硅片上，太阳电池的转换效率可达18.94%。与传统的酸性织构DWS mc-Si太阳能电池相比，绝对效率提高了0.5%。说明了在黑硅生产中控制银离子浓度的必要性。
As diamond wire sawn (DWS) technique for multi-crystalline Si (mc-Si) becomes mainstream wafering technology in Si-based photovoltaic industry, metal assisted chemical etching (MACE) method will become a key technique to improve conversion efficiency. Due to the intrinsic characteristic of Ag nanoparticles precipitation reaction in solution in the first step of MACE, a large number of deep nanopores are produced on the surface of mc-Si wafer in the following etching step. The deep nanopores can lead to the degradation of mc-Si solar cell's performances. Thus, the influences of Ag-ion concentration in the first step of MACE on the solar cell's performances was carefully studied. It's found that with the increasing of Ag-ion concentration, the light trapping capabilities keeps improving. However, the solar cell's electric performances deteriorate dramatically when Ag-ion concentration reaches to a certain value. Optical and electrical simulation is performed to explain the influences of deep nanopores on the mc-Si solar cell's performances. It is found that there is an optimum Ag-ion concentration value to enhance the mc-Si solar cell's performances, and an efficiency of 18.94% is obtained for large size of 156.75 × 156.75 mm2wafer. An absolute efficiency of 0.5% was improved as compared to the conventional acidic textured DWS mc-Si solar cell. It shows the necessity of controlling the Ag-ion concentration in the manufacture of black silicon.