학술논문
CIGS solar cells grown by a three-stage process with different evaporation rates
Document Type
Conference
Author
Source
2009 34th IEEE Photovoltaic Specialists Conference (PVSC) Photovoltaic Specialists Conference (PVSC), 2009 34th IEEE. :000812-000816 Jun, 2009
Subject
Language
ISSN
0160-8371
Abstract
Solar cells based on polycrystalline Cu(In,Ga)Se 2 (CIGS) absorber layers have shown high potential for low cost photovoltaic energy conversion. Our group has achieved 18.1% efficient cells on glass substrates and 14.1% on flexible polyimide foils [1] without antireflection (AR) coating. These results were achieved by applying a three-stage evaporation process with common growth rates of about 35 nm/min. Aim of this study was to enhance the growth rates of layers deposited at low substrate temperature (450°C) suitable for polyimide foils and to investigate structural properties of CIGS layers and photovoltaic properties of solar cells. It was found that very high deposition rates of 500 nm/min during the 2nd and 3rd stage of the evaporation process are feasible, maintaining high absorber quality and performance of solar cells.