Development of silicon heterojunction solar cell technology for manufacturing

Abstract

In this work, we describe some aspects of the Hanergy silicon heterojunction (SHJ) solar cell design and its manufacturing-friendly process. Experimental results are reported mainly with regard to texturing, silicon-based thin film deposition, and transparent conductive oxide (TCO) coating optimization. A conversion efficiency of 22.83% with VOC = 737.6 mV, JSC = 37.97 mA/cm2 and FF = 80.94% on a full-size M2 wafer has been certified by Fraunhofer ISE CalLab. Also demonstrated is a mean efficiency of 22.15% during a 45-day pseudo-pilot run. Two PV stations built with our bifacial 60-cell standard SHJ modules harvested 12.1 and 18.3% more solar energy in Chengdu than a single-sided n-type monocrystalline silicon reference PV station mainly owing to improvements of the rear side.