Modified laser-fired contact process for efficient PERC solar cells

Jae Myeong Choi; Beomsic Jung; Jong Keuk Park; Won Mok Kim; Doh Kwon Lee; Jeung hyun Jeong; Taek Sung Lee; Jea Young Choi; Byeong Kwon Ju; Inho Kim

doi:10.1002/pip.3187

Modified laser-fired contact process for efficient PERC solar cells

Jae Myeong Choi
, Beomsic Jung
, Jong Keuk Park
, Won Mok Kim
, Doh Kwon Lee
, Jeung hyun Jeong
, Taek Sung Lee
, Jea Young Choi
, Byeong Kwon Ju
, Inho Kim^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

A laser-fired contact (LFC) process is one of the techniques for making local electrical contacts at the rear side of passivated emitter and rear cell (PERC) solar cells. In the LFC process, opening of the passivated dielectric layers and alloying of Si and Al need to be made in a single step laser process. For this reason, the LFC process is accompanied by the loss of Al and the laser damage to the Si wafer. In this study, we present a novel multistep LFC process combining the conventional LFC and laser-induced forward transfer (LIFT) processes. The modified LFC scheme we proposed consists of three steps: (a) opening of the passivation layers and partial alloying of Al-Si, (b) additional deposition of Al on the local contact holes, and (c) post laser firing of the transferred Al. Applying the modified LFC process to the PERC cells of 1.0 cm² of area, we demonstrate the effective recombination velocity of the laser-processed wafers can be remarkably reduced while maintaining the low contact resistance. The best of the PERC solar cell fabricated by the modified LFC process exhibited an efficiency of 19.5% while the conventional LFC-PERC cell showed 18.6%. The efficiency gains of the modified LFC-PERC cells was largely contributed by the enhanced open circuit voltage (V_oc) and fill factor (FF).

Original language	English
Pages (from-to)	1092-1103
Number of pages	12
Journal	Progress in Photovoltaics: Research and Applications
Volume	27
Issue number	12
DOIs	https://doi.org/10.1002/pip.3187
Publication status	Published - 2019 Dec 1

Bibliographical note

Funding Information:
This work was partly supported by Korea Institute of Science and Technology (KIST) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20153030013060, 20163010012450, 20163010012580).

Publisher Copyright:
© 2019 John Wiley & Sons, Ltd.

Keywords

PERC cell
contact resistance
crystalline silicon solar cells
implied V
laser-fried contact
pulsed laser

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Condensed Matter Physics
Electrical and Electronic Engineering

UN SDGs

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

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10.1002/pip.3187

Cite this

@article{9c8842e77b6340b998d4f6aeaa28270e,

title = "Modified laser-fired contact process for efficient PERC solar cells",

abstract = "A laser-fired contact (LFC) process is one of the techniques for making local electrical contacts at the rear side of passivated emitter and rear cell (PERC) solar cells. In the LFC process, opening of the passivated dielectric layers and alloying of Si and Al need to be made in a single step laser process. For this reason, the LFC process is accompanied by the loss of Al and the laser damage to the Si wafer. In this study, we present a novel multistep LFC process combining the conventional LFC and laser-induced forward transfer (LIFT) processes. The modified LFC scheme we proposed consists of three steps: (a) opening of the passivation layers and partial alloying of Al-Si, (b) additional deposition of Al on the local contact holes, and (c) post laser firing of the transferred Al. Applying the modified LFC process to the PERC cells of 1.0 cm2 of area, we demonstrate the effective recombination velocity of the laser-processed wafers can be remarkably reduced while maintaining the low contact resistance. The best of the PERC solar cell fabricated by the modified LFC process exhibited an efficiency of 19.5\% while the conventional LFC-PERC cell showed 18.6\%. The efficiency gains of the modified LFC-PERC cells was largely contributed by the enhanced open circuit voltage (Voc) and fill factor (FF).",

keywords = "PERC cell, contact resistance, crystalline silicon solar cells, implied V, laser-fried contact, pulsed laser",

author = "Choi, \{Jae Myeong\} and Beomsic Jung and Park, \{Jong Keuk\} and Kim, \{Won Mok\} and Lee, \{Doh Kwon\} and Jeong, \{Jeung hyun\} and Lee, \{Taek Sung\} and Choi, \{Jea Young\} and Ju, \{Byeong Kwon\} and Inho Kim",

note = "Funding Information: This work was partly supported by Korea Institute of Science and Technology (KIST) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20153030013060, 20163010012450, 20163010012580). Publisher Copyright: {\textcopyright} 2019 John Wiley \& Sons, Ltd.",

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AU - Choi, Jae Myeong

AU - Jung, Beomsic

AU - Park, Jong Keuk

AU - Kim, Won Mok

AU - Lee, Doh Kwon

AU - Jeong, Jeung hyun

AU - Lee, Taek Sung

AU - Choi, Jea Young

AU - Ju, Byeong Kwon

AU - Kim, Inho

N1 - Funding Information: This work was partly supported by Korea Institute of Science and Technology (KIST) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20153030013060, 20163010012450, 20163010012580). Publisher Copyright: © 2019 John Wiley & Sons, Ltd.

PY - 2019/12/1

Y1 - 2019/12/1

N2 - A laser-fired contact (LFC) process is one of the techniques for making local electrical contacts at the rear side of passivated emitter and rear cell (PERC) solar cells. In the LFC process, opening of the passivated dielectric layers and alloying of Si and Al need to be made in a single step laser process. For this reason, the LFC process is accompanied by the loss of Al and the laser damage to the Si wafer. In this study, we present a novel multistep LFC process combining the conventional LFC and laser-induced forward transfer (LIFT) processes. The modified LFC scheme we proposed consists of three steps: (a) opening of the passivation layers and partial alloying of Al-Si, (b) additional deposition of Al on the local contact holes, and (c) post laser firing of the transferred Al. Applying the modified LFC process to the PERC cells of 1.0 cm2 of area, we demonstrate the effective recombination velocity of the laser-processed wafers can be remarkably reduced while maintaining the low contact resistance. The best of the PERC solar cell fabricated by the modified LFC process exhibited an efficiency of 19.5% while the conventional LFC-PERC cell showed 18.6%. The efficiency gains of the modified LFC-PERC cells was largely contributed by the enhanced open circuit voltage (Voc) and fill factor (FF).

AB - A laser-fired contact (LFC) process is one of the techniques for making local electrical contacts at the rear side of passivated emitter and rear cell (PERC) solar cells. In the LFC process, opening of the passivated dielectric layers and alloying of Si and Al need to be made in a single step laser process. For this reason, the LFC process is accompanied by the loss of Al and the laser damage to the Si wafer. In this study, we present a novel multistep LFC process combining the conventional LFC and laser-induced forward transfer (LIFT) processes. The modified LFC scheme we proposed consists of three steps: (a) opening of the passivation layers and partial alloying of Al-Si, (b) additional deposition of Al on the local contact holes, and (c) post laser firing of the transferred Al. Applying the modified LFC process to the PERC cells of 1.0 cm2 of area, we demonstrate the effective recombination velocity of the laser-processed wafers can be remarkably reduced while maintaining the low contact resistance. The best of the PERC solar cell fabricated by the modified LFC process exhibited an efficiency of 19.5% while the conventional LFC-PERC cell showed 18.6%. The efficiency gains of the modified LFC-PERC cells was largely contributed by the enhanced open circuit voltage (Voc) and fill factor (FF).

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KW - laser-fried contact

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JO - Progress in Photovoltaics: Research and Applications

JF - Progress in Photovoltaics: Research and Applications

IS - 12

ER -

Modified laser-fired contact process for efficient PERC solar cells

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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