> 85% Indium Reduction for High-Efficiency Silicon Heterojunction Solar Cells with Aluminum-Doped Zinc Oxide Contacts

材料科学 异质结 兴奋剂 光电子学 氧化铝 还原(数学) 冶金 几何学 数学
作者
Quntao Tang,Weiyuan Duan,Andreas Lambertz,Karsten Bittkau,Muhammad Ainul Yaqin,Yilin Zhao,Kai zhang,Qing Yang,Depeng Qiu,Uwe Rau,Kaining Ding
出处
期刊:Social Science Research Network [Social Science Electronic Publishing]
被引量:1
标识
DOI:10.2139/ssrn.4176859
摘要

Aluminum-doped zinc oxide (AZO) has long been known as a promising low-cost alternative contact to conventional expensive indium-doped tin oxide (ITO) on silicon heterojunction (SHJ) solar cells. However, low fill factor (FF) of the AZO-based SHJ solar cell greatly limits the device performance as well as poses concerns about its commercial potential. Here, we present ITO/AZO/ITO stack as front contact on rear-junction SHJ cell, solving three challenges including sputter damage, bad contact and low conductivity simultaneously that are encountered on pure front AZO-based devices. Additionally, mechanism underlying the superior performance of ITO/AZO/ITO stack is unveiled by the analysis of phase, lifetime and electrical properties followed by Quokka3 simulation of vertical and lateral carrier transport. Then, successfully direct use of pure AZO at rear side of SHJ cell is demonstrated, though with a small increase of total series resistance (Rs). Finally, a champion efficiency of 23.8% with > 85% indium reduction is achieved on M2+ size cell by using ITO/AZO/ITO at n-side and pure AZO at p-side, showing a high average efficiency (η ~ 23.6%) close to that of totally ITO-based references (η ~ 23.7%). These findings provide a promising way to fabricate low-indium and high-efficiency SHJ cells with commercial potential.
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