Title :
Progress in four-terminal nano-crystalline Si/amorphous Si solar cells
Author :
Hu, Jian ; Dalong Zhong ; Dang, Huong ; Madan, Awn
Author_Institution :
MVSystems, Inc., Golden, CO, USA
Abstract :
We report a conversion efficiency of ∼9.5% using nano-crystalline Si/amorphous Si (nc-Si/a-Si) solar cells constructed in a four-terminal (4-T) tandem junction configuration. This type of tandem junction releases the constraint of current matching from each constituent cell thus allowing the fabrication of thin film Si stable, high efficiency devices. The improvement in efficiency, in comparison with our earlier results, is due to the use of MgF2 anti-reflection (AR) coating which reduces the reflection loss at the ITO/air interface at the front portion of the entire device.
Keywords :
amorphous semiconductors; antireflection coatings; elemental semiconductors; light reflection; nanostructured materials; optical losses; semiconductor junctions; silicon; solar cells; thin film devices; ITO-air interface; MgF2; Si; antireflection coating; conversion efficiency; current matching; four-terminal nanocrystalline Si-amorphous Si solar cells; reflection loss; tandem junction; Amorphous materials; Costs; Degradation; Fabrication; Photonic band gap; Photovoltaic cells; Semiconductor thin films; Silicon; Thin film devices; Voltage;
Conference_Titel :
Photovoltaic Specialists Conference, 2005. Conference Record of the Thirty-first IEEE
Print_ISBN :
0-7803-8707-4
DOI :
10.1109/PVSC.2005.1488415
