Understanding and mitigating the light-induced degradation in screen-printed Al-BSF boron-doped Czokralski crystalline silicon solar cells by use of infrared belt furnace rapid thermal processing.

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Mvutu, M. (2016). Understanding and mitigating the light-induced degradation in screen-printed Al-BSF boron-doped Czokralski crystalline silicon solar cells by use of infrared belt furnace rapid thermal processing. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

ABSTRACTMAYANGI MA MVUTU. Understanding and mitigating the light-induced degradation in screen printed Al-BSF Cz-Si solar cell by use of IR-belt furnace Rapid Thermal Processing. (Under the direction of DR. ABASIFREKE EBONG)In this study, Rapid Thermal Processing was used to understand and mitigate the light-induced degradation in boron-doped Cz-Si solar cells. Two different design-types of solar cells were used in the experiment to investigate the impact the solar cell design (structure) might have in lifetime recovery. The two design types include 5-Busbar (5BB) and 4-Street-5-Busbar (4S-5BB), with a resistivity of 2 Ω-cm, surface area of 239 cm2, thickness of 0.018 cm, and doping concentration of 7.22 x 1015 cm-3. In the annealing process, the peak temperature of 795°C, belt speed of 210 ipm, and dwell time of less than 2 minutes were used. It was found that solar cell design-type does not affect the lifetime recovery, since both design-types showed similar trends in all electrical output parameters. Also, although the lifetime was fully recovered following the annealing, the efficiency was not, because of contact degradation that resulted in high series resistance and junction recombination. Thus contact firing is key to effective lifetime and efficiency recovery.

Details
Author

Mvutu, Mayangi

Title

Understanding and mitigating the light-induced degradation in screen-printed Al-BSF boron-doped Czokralski crystalline silicon solar cells by use of infrared belt furnace rapid thermal processing.

Physical Description

1 online resource (63 pages) : PDF

Date

2016

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

ABSTRACTMAYANGI MA MVUTU. Understanding and mitigating the light-induced degradation in screen printed Al-BSF Cz-Si solar cell by use of IR-belt furnace Rapid Thermal Processing. (Under the direction of DR. ABASIFREKE EBONG)In this study, Rapid Thermal Processing was used to understand and mitigate the light-induced degradation in boron-doped Cz-Si solar cells. Two different design-types of solar cells were used in the experiment to investigate the impact the solar cell design (structure) might have in lifetime recovery. The two design types include 5-Busbar (5BB) and 4-Street-5-Busbar (4S-5BB), with a resistivity of 2 Ω-cm, surface area of 239 cm2, thickness of 0.018 cm, and doping concentration of 7.22 x 1015 cm-3. In the annealing process, the peak temperature of 795°C, belt speed of 210 ipm, and dwell time of less than 2 minutes were used. It was found that solar cell design-type does not affect the lifetime recovery, since both design-types showed similar trends in all electrical output parameters. Also, although the lifetime was fully recovered following the annealing, the efficiency was not, because of contact degradation that resulted in high series resistance and junction recombination. Thus contact firing is key to effective lifetime and efficiency recovery.

Genre

masters theses

Subjects--Topics

Power resources

Degree

M.S.

Keywords

Annealing
Efficiency
Lifetime
Light-Induced Degradation
Rapid Thermal Processing
Recombination

Subject Area

Applied Energy & Electromechanical System

Advisor(s)

Ebong, Abasifreke
Maciej, Noras

Committee Members

Zhang, Yong
Sherlock, Barry
Cali, Umit

Degree Note

Thesis (M.S.)--University of North Carolina at Charlotte, 2016.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Mvutu_uncc_0694N_11288

Permalink

http://hdl.handle.net/20.500.13093/etd:566