Researchers in South Korea have demonstrated a lower temperature process for bifacial copper, indium, selenium (Cuinsse₂) solar cells with a rear efficiency of 8.44% and 15.30% at the front. The device has been developed for applications in tandem solar cells.
Researchers from the Daegu Gyeongbuk Institute of Science and Technology (Dgist) in South Korea have announced a new process to make bifacial narrow band buyer, Indium, Selenium (Cuinu day) solar cells. A transparent conductive oxide (TCO) was used to make bifacial effect possible in a lower temperature process that included a silver (AG) alloy step.
The researchers chose to investigate copper-Indium-Gallium-selenide (CIGS) materials, and Cuinsse₂ (CIS) for bifacial solar cells, in particular, because of their narrow bandgap and potential for use in all-din-film Tandem perovskite solar cells, building-integrated photovoltaics.
“In the empire of CIGS materials, CIS is especially remarkable. With a band gap of approximately 1.0 EV, it is a promising partner for a tandem solar cell with perovskiet. This setup ensures a reduction in the corresponding author of the Bromine (BR), research research, research of the research. PV Magazine.
“Our approach was new in various important aspects. We successfully minimized the use of silver by using a thin AG layer of 5 Nm, which not only maintained high device performance, but also improved material cost efficiency,” said Kim.
“Moreover, we have optimized a growth process for low temperature that turned out to be very beneficial for the ITO/CIGS interface,” he said, and explained that at reduced temperatures the formation of “harmful” Amorf Gallium oxide (GAOX) on the rear interface “was” waxed “considerably.”
“As a result, we were able to reach an exceptionally powerful output in the ~ 1.0 EV CIS category when measured under both rear and bifacial lighting,” Kim said.
The work did indeed result in a champion cell with a rear efficiency of 8.44% and 15.30% at the front.
In the study, samples were produced with an ITO layer of 200 Nm on soft drink lime glass, followed by a silver (AG) layer of 5 Nm, then the low gallium-moored CIS-Absorber. A modified multi-phases co-evaporation process was used to optimize the back interface of the Absorber, which was confirmed by transversal field emissions scanning electron microscopy image formation.
The group has optimized the growth process for low temperature and analyzed the quality of the processed samples of 460, 420 and 390 ° C, both with and without the silver alloy.
It said that the champion narrow bandgap cis with AG-alleged devices on the back achieved efficiency of 8.44%, with the front registering 15.30%. The bifacial power generation density (BPGD) was 23.1 MW/cm², according to the study. The group claimed that these are record results.
Kim added that because the team was able to manufacture Bifacial CIs without ‘significant difficulties’, the process and the methods from the study could probably be applied in the wider area of Bifacial CIGS studies.
The group concluded that the lower deposition temperatures improved the performance on the back and that the study has demonstrated the role of low temperature processing, low GA doting and AG alloy when suppressing carrier recombination losses in CIS sun cells.
The work is detailed in “Very efficient bifacial narrow bandgap AG-Cinse2 solar cells on ITO‘It appears in advanced energy materials.
The following research focus of the group is the use of the highly efficient narrow bandgap CIS solar cells in bifacial perovskiet-cis tandem architectures. “By using the optimized low temperature process and the improvements of the rear, we want to shift the performance limits of bifacial tandemas. We also use these findings in parallel to antimony-based thin film Solar cells in our group, their potential for scalable and efficient.” Said said.
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