09 ishikawa pvgs

Industrial production of
high efficiency and high bifaciality
solar cells
Industrial production of
high efficiency and high bifaciality
solar cells
Naoki Ishikawa
President / CEO
Naoki Ishikawa
President / CEO
EarthON Cell
High Efficiency & Bifacial
Photovoltaic Technical Solutions Copyright © 2012 PVG Solutions Inc.0
r01ni
President / CEOPresident / CEO
bifi workshop, Konstanz, Germany, April 23, 2012
http://www.pvgs.jp

Outline
Introduction and current status of PVGS
Introduction of high eff and bifacial “EarthONTM” cell
Cell structure and advantages
Cell properties, etc.
Industrial production result
Eff distribution
Bifaciality distribution
Module performance
High efficiency road map
Summary

Established Mar. 15, 2007
Business
bases
HQ (Yokohama, Kanagawa, JP)
R&D laboratory (Saijo, Ehime, JP)
Analysis center (Saijo, Ehime, JP)
Introduction of PVGS
PVGS is a company providing total technical solutions for PV
related industry.
Analysis center (Saijo, Ehime, JP)
High efficiency PV cell factory (Saijo, Ehime, JP)
Technical service center (Shanghai, CN)
Employees 47 (April, 2012)
Business
segments
Technology license
Materials
Analysis and evaluation
High efficiency bifacial cell

Main business bases
HQ (Yokohama, JP)
R&D laboratory (Saijo, JP)
Process development
Analysis center Saijo, JP)
Evaluation of wafers and cells
High eff PV cell factory (Saijo, JP)
Wet Thermal Dry
Material development
High eff PV cell factory (Saijo, JP)
The unique factory designed only for BF cells
Technical service center (Shanghai, CN)
Contact formation
Ag Paste Resist ink Chemicals
Capacity : 35MW / Operation : July, 2011~
Front
Rear

Naoki ISHIKAWA, CEO
Background : Chemistry, Semiconductor Physics
PV Career : 24 Years
Business Career : AirWater, Ebara, ShinEtsu
• High Efficiency c-Si Cell, BIPV, Electrode Material
Shinji GODA, CTO
Background : Semiconductor Physics
Business Career : Air Water, Hitachi
• High Efficiency c-Si Cell, Bifacial Solar Cell, Mass Production
Board members
Satoshi OISHI, Managing Director
Business Career : Panasonic
• Project Management, PV Factory Management
Shinji HORIUCHI, COO
Business Career : Air Water, MSK, Samsung C&T
• Sales, Marketing, Procurement

20
21
22
23
24
25CellEfficiency[%] Front Eff.
Rear Eff.
Our history
n-type
19.0%
bifacial
n-type
19.5%
bifacial
n-type
20.0%
bifacial
15
16
17
18
19
2007 2008 2009 2010 2011 2012
2Q
2012
4Q
2013 2014
CellEfficiency[%]
Est. of
PVGS
p-type
18.0%
Start of
R&D Lab
Start of
Factory
Improvement of
bifaciality
(=Rear/Front)
*R&D level (Production level is 6 months behind.)

Outline
Eff distribution
Module performance
Summary

Wafer type n
Si crystal Mono
Size 156mm□×180μm
Efficiency Front 19.5 % / Rear 19.0 %
Structure and advantages of “EarthONTM” cell
Brand Concept:
“ Photovoltaics must be
the Secret Weapon for our Earth ”
EarthON 【】
Cell Structure
Cz-Si
n-type (Phs.)
n+
Ag
ARC
TCO SiNx
ARC
p+
Ag
Advantages
1. High efficiency
2. High Bifaciality (Rear/Front > 95%)
3. No LID
4. Possible to use thinner wafer (Symmetric
electrode)
5. Compatible to conventional module
production line (Stringer, laminator, etc.)

Dimensions
Tip of busbar design
Front side Rear side [mm]
26 26 26 2652 52 52 52
1.2 1.5
156
156
156156
156
156
Updated on Feb 27, 2012
The middle finger of Rear side
has a vertical line that forms
“T” shape.
The middle finger of Front side
has a vertical line that forms
“+” (plus) shape.

IV characteristics (front side)
High efficiency was confirmed by AIST (Agency of Industrial Science and Technology) precious measurement.

The same cell as
previous slide
IV characteristics (Rear side)
High efficiency was confirmed by AIST (Agency of Industrial Science and Technology) precious measurement.
High bifaciality (rear/front=19.1/19.4=98.5%) was also confirmed.

80
90
100
110
1 10 100 1000
Voc[%]
Time [hours]
Light from FRONT side
Light from REAR side
80
90
100
110
1 10 100 1000
Isc[%]
Time [hours]
110 110
No LID (Light Induced Degradation)
Voc Isc
80
90
100
110
1 10 100 1000
FF[%]
Time [hours]
80
90
100
110
1 10 100 1000
Eff.[%]
Time [hours]
EarthON cells which made from n-type wafers are LID-free. In case of P type cells, LID affect as Voc degradation,
however in case of EarthON, there are no degradation in spite of 1,500 hours irradiation at 1kW/m2.
updated on Feb 27, 2012
FF Eff

Outline
Eff distribution
Module performance
Summary

Distribution of Eff
*Measurement condition : STC
0,6% 0,3% 0,3% 0,5% 0,9%
3,0%
14,3%
43,2%
33,9%
3,1%
0,0%
0%
10%
20%
30%
40%
50%
17,6 17,8 18,0 18,2 18,4 18,6 18,8 19,0 19,2 19,4 19,6
Frequency
Eff (front side) [%]
1,4% 0,4% 0,6% 1,5%
4,4%
15,3%
35,3%
31,8%
8,8%
0,5% 0,0%
0%
5%
10%
15%
20%
25%
30%
35%
40%
630 632 634 636 638 640 642 644 646 648 650
Frequency
Voc (front side) [mV]
32,7%35% 33,0%35%
Production result
(March, 2012)
4 category
95%
0,3% 0,2% 0,8%
3,8%
13,9%
29,5%
32,7%
16,1%
2,6%
0,1% 0,0%
0%
5%
10%
15%
20%
25%
30%
35%
8,80 8,84 8,88 8,92 8,96 9,00 9,04 9,08 9,12 9,16 9,20
Frequency
Isc (front side) [A]
0,6% 0,4% 0,9% 2,2%
5,3%
13,8%
29,9%
33,0%
12,5%
1,2% 0,1%
0%
5%
10%
15%
20%
25%
30%
35%
76,0 76,4 76,8 77,2 77,6 78,0 78,4 78,8 79,2 79,6 80,0
Frequency
FF (front side) [%]
High production yield was obtained and the latest average eff (of production lot) is going over 19.2%.
The very stable operation of our unique factory, designed only for bifacial cells, was confirmed.

Distribution of Bifaciality
0%
5%
10%
15%
20%
25%
30%
35%
40%
Frequency
Eff [%]
Front Eff
-3σ=18.57% +3σ=19.30%
0%
5%
10%
15%
20%
25%
30%
35%
40%
Frequency
Eff [%]
Rear Eff
-3σ=17.81% +3σ=18.81%
Eff [%]
0%
5%
10%
15%
20%
25%
30%
35%
40%
Frequency
Bifaciality[%]
Bifaciality
-3σ=94.66% +3σ=98.72%
Eff of rear side was also high.
It was confirmed that bifaciality was over
95% in industrial production result.

Outline
Eff distribution
Module performance
Summary

Direct Light
Concrete
Diffused Light
Measurement of module performance (outside)
1,1 p-type 60cells white B/S
900
Reflected Light
26.5°
EarthON 60cells clear B/S
Cell to Cell : 15mm
0,7
0,8
0,9
1,0
1,1
800 850 900 950 1000 1050
StandardizedPmax
Irradiation [W/m2]
p-type 60cells white B/S
Bifacial effect
LID (1~2%?)
11.5%
14.5%
Bifacial effect
Space (cell to cell) effect
LID (1~2%?)
p-type 60cells white B/S
EarthON 60cells clear B/S Cell to Cell : 15mm

EVA
1.75 concentration module
Up to 50% less silicon
Improved performance in low irradiance conditions
New-design module using EarthON cell
Glass
EarthON Cell EarthON Cell
Reflector
One of our JP customers had applied EarthON
cells for new-design module.
3kW demonstration test

Outline
Eff distribution
Module performance
Summary

IV characteristics of “EarthON-20” (20% Cell)
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Current[A],Power[W]
IV-Characteristic Front
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Current[A],Power[W]
IV-Characteristic Rear
Measurement Result
Isc
[A]
Jsc
[mA/cm2]
Voc
[mV]
Imp
[A]
Vmp
[V]
Pmax
[W]
9.33 39.03 650.3 8.71 0.55 4.79
FF
[%]
Eff
[%]
Area
[cm2]
Rs.
[Ωcm2]
Rsh
[Ωcm2]
78.97 20.05 239.0 0.72 1.79E+04
Measurement Result
Isc
[A]
Jsc
[mA/cm2]
Voc
[mV]
Imp
[A]
Vmp
[V]
Pmax
[W]
8.99 37.62 648.4 8.41 0.55 4.62
FF
[%]
Eff
[%]
Area
[cm2]
Rs.
[Ωcm2]
Rsh
[Ωcm2]
79.25 19.33 239.0 0.69 5.43E+03
-1.0
0.0
1.0
2.0
-0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Current[A],Power[W]
Voltage[V]
-1.0
0.0
1.0
2.0
-0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Current[A],Power[W]
Voltage[V]

20
21
22
23
24
25CellEfficiency[%] Front Eff.
Rear Eff.
n-type
19.0%
bifacial
n-type
19.5%
bifacial
n-type
20.0%
bifacial
n-type
21.0%
bifacial
n-type
22.0%
bifacial
n-type
15
16
17
18
19
2007 2008 2009 2010 2011 2012
2Q
2012
4Q
2013 2014
CellEfficiency[%]
Est. of
PVGS
p-type
18.0%
Start of
R&D Lab
Start of
Factory
Improvement of
bifaciality
(=Rear/Front)
*R&D level (Production level is 6 months behind.)
n-type
20.0%
Bifacial
(Industrial
production)

Outline
Eff distribution
Module performance
Summary

Summary
We had succeeded to develop high eff and bifacial “EarthONTM” cell.
The unique 35MW factory, designed only for production of bifacial
cells, had completed in July ,2011.
The factory is in operation stably, high production yield was obtained
and the latest average eff is going over 19.2%
It was confirmed that bifaciality was over 95% in industrial production
result.
Bifacial effect of 14.5% was confirmed by measuring module
performance at outside.
We had completed 20% bifacial cells in R&D and will upgrade
production level in the near future.
The latest Topic
0.5MW (0.46MW in front side) bifacial PV system of our JP customer (general
electric company) is under construction and will be in operation in Jun, 2012.
The system will become the world largest bifacial PV plant.

URL:http://www.pvgs.jp
pvgs@pvgs.com
PVG Solutions Inc.
PVG Solutions Inc.
Headquarter
Nisso 12th Bldg. 9F,3-6-12 Shinyokohama, Kohoku-ku, Yokohama-shi, Japan 222-0033
TEL:81-45-474-5656 / FAX 81-45-474-5657
Saijo Factory
455-1, Minato, Saijo-shi, Ehime, Japan 793-0046
TEL: 81-897-47-6030 / FAX:81-897-47-6031
Saijo Laboratory
293-1, Minato, Saijo-shi, Ehime, Japan 793-0046
TEL 81-897-47-5050 / FAX 81-897-47-5051
Shanghai Technical Service Center
Rm 2905, Kerry Ever Bright Tower2, No.218 Tian Mu Xi Lu, Shanghai, 200070, China
TEL :86-21-63536098 / FAX: 86-21-33030779

09 ishikawa pvgs

More Related Content

What's hot

Viewers also liked

Similar to 09 ishikawa pvgs

More from Sandia National Laboratories: Energy & Climate: Renewables

Recently uploaded

09 ishikawa pvgs