1 research outputs found
Enhanced Conversion Efficiency of Cu(In,Ga)Se<sub>2</sub> Solar Cells via Electrochemical Passivation Treatment
Defect control in CuÂ(In,Ga)ÂSe<sub>2</sub> (CIGS) materials, no matter what the defect type or density,
is a significant issue, correlating directly to PV performance. These
defects act as recombination centers and can be briefly categorized
into interface recombination and Shockley–Read–Hall
(SRH) recombination, both of which can lead to reduced PV performance.
Here, we introduce an electrochemical passivation treatment for CIGS
films that can lower the oxygen concentration at the CIGS surface
as observed by X-ray photoelectron spectrometer analysis. Temperature-dependent <i>J–V</i> characteristics of CIGS solar cells reveal that
interface recombination is suppressed and an improved rollover condition
can be achieved following our electrochemical treatment. As a result,
the surface defects are passivated, and the power conversion efficiency
performance of the solar cell devices can be enhanced from 4.73 to
7.75%