11 po-tsung hsieh ok
TRANSCRIPT
Performance of bifacial module of
n-PERT cells
Po-Tsung Hsieh
Motech Industries, Inc.
May 26, 2014
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Motech Industries, Inc.
Motech AmericasNewark, DE, US
Taipei, Taiwan
Itogumi MotechHokkaido, Japan
Motech (Suzhou)Kunshan, China
Tainan, Taiwan
No.6 solar cell producer in the world
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Outline
Introduction
Cell Improvements
N-PERT Hybrid Cell
Module Performance
Conclusions
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Outline
Introduction
Cell Improvements
N-PERT Hybrid Cell
Module Performance
Conclusions
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Year/Conference 20132013
EUPVSEC2014nPV
2014nPV
2014 nPV
2013 EUPVSEC
2013EUPVSEC
2014bifiPV
Company/Institute LG BOSCH INESISC
KonstanzISFH ECN PVGS Motech
Junction Front Front Front Front Front Front Front FrontStructure Bifacial Bifacial Bifacial Bifacial Bifacial Bifacial Bifacial Bifacial
Efficiency 21 20.7 20.5 20.3 20.3 20.23 20.16 20.73
Bifacial nPERT Efficiency
nPERT = n-type Passivated Emitter, Rear Totally diffused
Rear junction, Monofacial: Q Cells, IMEC
Front junction, Monofacial: ISFH, Bosch, Suniva
Front junction, Bifacial: ECN, Bosch, Motech…
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Outline
Introduction
Cell Improvements
N-PERT Hybrid Cell
Bifacial Module Performance
Conclusions
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Emitter Improvement
Performance of different boron emitters QSSPC on symmetric monitor wafers Improved cell efficiency with optimized boron emitter
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Front Side Paste
Voc(mV)
Jsc (mA/cm2)
FF(% abs)
Eff(% abs)
A2-A1 0.2 0.20 1.4 0.4 A3-A1 0.3 0.17 1.7 0.5
Paste selection strongly impacts FF
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Improvements Combined
Achieved >20.7% cell efficiency
Independently measured by ITRI’s Solar cell Calibration and Characterization Laboratory (SCCL) metal coated chuck
Voc Jsc FF Eff
647 39.2 81.76 20.73
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nPERT Benefits
Pmax Voc JscnPERT -0.36 -0.29 0.045
p-mono -0.42 -0.33 0.040
Superior temperature coefficients
Absence of LID
Superior low light performance
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Bifaciality
Bifaciality = (Rear Eff) / (Front Eff) Less polished: 88.5% More polished: 85.7%
Depend on applications: Vertical module installation High bifaciality Standard module installation Higher front-side efficiency
Est. total efficiency=front eff.+0.2*rear eff.
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Outline
Introduction
Cell Improvements
N-PERT Hybrid Cell
Module Performance
Conclusions
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Bosch (2013 EUPVSEC_2BV 2.54)
nPERT Hybrid Cell
Potential of n-Hybrid cell process Higher throughput for implant Less process steps
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Motech: n-Hybrid Cell
Relative gain vs. BKM n-PERT cell
Advantages of n-Hybrid Cell: Potential for higher efficiency Lower total cost per watt
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Outline
Introduction
Cell Improvements
N-PERT Hybrid Cell
Module Performance
Conclusions
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~30% output gain for nPERT bifacial module (60 cells):
320W effective output as compared with p-mono reference
module.
p-mono reference module(246W)
nPERT bifacial module
n-PERT Bifacial Module
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n-PERT Bifacial Module
Higher PR gain in morning and evening (standard installation)
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~20% bifacial gain from bifacial module in outdoor test
n-PERT Bifacial Module
Monofacial module
Bifacial module
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Outline
Introduction
Cell Improvement
N-PERT Hybrid Cell
Module Performance
Conclusions
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nPERT bifacial cells produced with industrial fabrication processes achieved cell efficiency > 20.7% potential of n-Hybrid cell
nPERT module field test provided for modules with effective power output 320W >20% of PR gain for bifacial module
Conclusions
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Important steps for future development in cell/module level Higher efficiency Quantify the benefits measurements standard Optimize module and system design for bifacial cells
Conclusions
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Team members:Chih-Jeng Huang, Hung-Chih Chang, Wei-Cheng Mo, Shu-Hung Yu, Chi-Chun Li
Cell and Module measurements Solar cell Calibration and Characterization Laboratory (SCCL), Industrial Technology Research Institute (ITRI) of Taiwan
Acknowledgement
PT Hsieh, bifi PV Workshop, May 26 2014
Thank You
for Your Attention