Efficient Crystalline Si Solar Cell with Amorphous/Crystalline Silicon Heterojunction as Back Contact

Bill Nemeth; Qi Wang; Wei Shan

doi:10.1109/PVSC.2012.6318039

Efficient Crystalline Si Solar Cell with Amorphous/Crystalline Silicon Heterojunction as Back Contact

Bill Nemeth, Qi Wang, Wei Shan

Chemistry and Nanoscience

Research output: Contribution to conference › Paper › peer-review

1 Scopus Citations

Abstract

We study an amorphous/crystalline silicon heterojunction (Si HJ) as a back contact in industrial standard p-type five-inch pseudo-square wafer to replace Al back surface field (BSF) contact. The best efficiency in this study is over 17% with open-circuit (V_oc) of 0.623 V, which is very similar to the control cell with Al BSF. We found that V_oc has not been improved with the heterojunction structure in the back. The typical minority carrier lifetime of these wafers is on the order of 10 μs. We also found that the doping levels of p-layer affect the FF due to conductivity and band gap shifting, and an optimized layer is identified. We conclude that an amorphous/crystalline silicon heterojunction can be a very promising structure to replace Al BSF back contact.

Original language	American English
Pages	2229-2231
Number of pages	3
DOIs	https://doi.org/10.1109/PVSC.2012.6318039 https://doi.org/10.1109/PVSC.2012.6318039
State	Published - 2012
Event	38th IEEE Photovoltaic Specialists Conference, PVSC 2012 - Austin, TX, United States Duration: 3 Jun 2012 → 8 Jun 2012

Conference

Conference	38th IEEE Photovoltaic Specialists Conference, PVSC 2012
Country/Territory	United States
City	Austin, TX
Period	3/06/12 → 8/06/12

Bibliographical note

See CP-5200-54136 for preprint

NREL Publication Number

NREL/CP-5200-56957

Keywords

amorphous
heterojunction
photovoltaic cells
silicon

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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Cite this

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title = "Efficient Crystalline Si Solar Cell with Amorphous/Crystalline Silicon Heterojunction as Back Contact",

abstract = "We study an amorphous/crystalline silicon heterojunction (Si HJ) as a back contact in industrial standard p-type five-inch pseudo-square wafer to replace Al back surface field (BSF) contact. The best efficiency in this study is over 17% with open-circuit (Voc) of 0.623 V, which is very similar to the control cell with Al BSF. We found that Voc has not been improved with the heterojunction structure in the back. The typical minority carrier lifetime of these wafers is on the order of 10 μs. We also found that the doping levels of p-layer affect the FF due to conductivity and band gap shifting, and an optimized layer is identified. We conclude that an amorphous/crystalline silicon heterojunction can be a very promising structure to replace Al BSF back contact.",

keywords = "amorphous, heterojunction, photovoltaic cells, silicon",

author = "Bill Nemeth and Qi Wang and Wei Shan",

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doi = "10.1109/PVSC.2012.6318039",

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AU - Nemeth, Bill

AU - Wang, Qi

AU - Shan, Wei

N1 - See CP-5200-54136 for preprint

PY - 2012

Y1 - 2012

N2 - We study an amorphous/crystalline silicon heterojunction (Si HJ) as a back contact in industrial standard p-type five-inch pseudo-square wafer to replace Al back surface field (BSF) contact. The best efficiency in this study is over 17% with open-circuit (Voc) of 0.623 V, which is very similar to the control cell with Al BSF. We found that Voc has not been improved with the heterojunction structure in the back. The typical minority carrier lifetime of these wafers is on the order of 10 μs. We also found that the doping levels of p-layer affect the FF due to conductivity and band gap shifting, and an optimized layer is identified. We conclude that an amorphous/crystalline silicon heterojunction can be a very promising structure to replace Al BSF back contact.

AB - We study an amorphous/crystalline silicon heterojunction (Si HJ) as a back contact in industrial standard p-type five-inch pseudo-square wafer to replace Al back surface field (BSF) contact. The best efficiency in this study is over 17% with open-circuit (Voc) of 0.623 V, which is very similar to the control cell with Al BSF. We found that Voc has not been improved with the heterojunction structure in the back. The typical minority carrier lifetime of these wafers is on the order of 10 μs. We also found that the doping levels of p-layer affect the FF due to conductivity and band gap shifting, and an optimized layer is identified. We conclude that an amorphous/crystalline silicon heterojunction can be a very promising structure to replace Al BSF back contact.

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T2 - 38th IEEE Photovoltaic Specialists Conference, PVSC 2012

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ER -

Efficient Crystalline Si Solar Cell with Amorphous/Crystalline Silicon Heterojunction as Back Contact

Abstract

Conference

Bibliographical note

NREL Publication Number

Keywords

UN SDGs

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