TFT 2010.10.21

OJT

OJT

A B C

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8 10

I

1 2006.6.1 2008.3.31

NIPPON GOHSEI

: 2 : 2008.4.1~2010.3.31

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Why flexible solar cells?

• Reduction of weight and volume:

Easy installation, reduction of cost for transportation and stock

• Flexible:

Easy installation on curved roof and wall

• Roll-to-roll process:

High productivity

• Difficult to break

Fuji Electric Systems Co., Ltd. (Japan)

• Substrate type with series-connection through apertures formed on film substrate (SCAF) structure

• Monolithic integration by laser patterning

• High voltage

• a-Si:H/a-SiGe:H on PI by stepping roll PECVD

• PI film with a width of 1 m and a length of 1500-2000 m

• Weight of flexible module is about 1/10 in comparison with that of conventional module using glass

• Production line at Kumamoto

CVD & Sputtering Chambers

Stepping roll deposition system

Triple junction on SUS sheet

(a-Si:H/a-SiGe:H/nc-Si:H)

Cell efficiency: 15.39% (initial)

Length: 5486 mm

Width: 394 mm

Depth: 4 mm Weight: 7.7 kg

(USA)

Roll-to-roll process

Applications

United Solar Ovonic

“PV-Lab FLEXCELLENCE” (EU)

• Development of roll-to-roll technology

• Specific targeted research or innovation project

(STREP) financed by the 6th Framework

Program of the EU

• 3 year project from October 1, 2005

• Coordinated by Prof. Christophe Ballif of the

Photovoltaics and Thin Film Electronics

Laboratory, the Institute of Microtechnology, the

University of Neuchâtel

Structure of FLEXCELLENCE

Recent results by “PV-Lab FLEXCELLENCE”

CIGS (Cu(In,Ga)Se2) flexible modules

Global Solar Energy (USA)

Roll-to-roll, co-evaporation,

13.2% on SUS,

11.3% on PI

Roll-to-roll, screen

printing of nanoparticle

ink

Nanosolar (USA)

Substrate

(%)

Voc (/cell)

(V)

Jsc

(mA/cm2) FF

Ap. area

(cm2) Mo thickness Se source

Cer. 300 m 15.9* 11.59 (0.682) 33.4 0.699 75.7 800 nm Evaporative

Cer. 200 m 15.9* 11.61 (0.683) 34.0 0.684 75.7 400 nm Evaporative

*independently certified efficiency.

CIGS growth temperature 550

(17 cells, ap. area 75.7cm2)

10 10 cm2 size 200- m thick

ceramic substrate submodule

Flexible ceramic substrate

Flexible light-through spherical crystalline Si

solar cells

Kyosemi

Flexible organic thin-film solar cell modules

20-nm p-phthalocyanine

50-nm n-C60

AIST, Tokki Corp., Mitsubishi Corp.

Full-plastic DSC module

Thickness: 0.5 mm

Weight: 0.8 kg/m2

Output: >110V

Toin University of Yokohama

World largest size, 0.8 m 2.1 m

TCO

TCO

UV

M. Fonrodona et al., Solar Energy Materials & Solar Cells 89 (2005) 37–47

C. Ballif et al., 2nd Int. Plastic Electronics Conf. and Showcase 2003-298084,298085,298086

Acrylic resin

Tg >200 oC

Transparency 92% Coefficient of Thermal Expansion

63 ppm Elastic modulus 4.3 GPa (30

oC)

2.1 GPa (200 oC)

Monomer

(Liquid)

UV

Polymer

(Solid)

NIPPON GOHSEI

PEN ®

AFM image

Textured plastic film roll Coat by

acrylic monomer Lamination UV-curing

(or/and heat)

Remove

Film

2p(2 parts) Film

Asahi-U

300 nm 150 nm

AFM

Asahi-U

TCO

RMS = 39nm

2p

RMS = 38nm

2p

RMS = 38nm

PEN

2p

RMS = 38nm

PV Japan 2008

-

PEN

PI PEN

Substrate Jsc (mA/

cm2) Voc (V) Fill factor

Efficiency (%)

Asahi-U 15.7 0.88 0.59 8.2

Asahi-U-transferred PI 15.0 0.84 0.65 8.3

Flat PI 11.7 0.83 0.68 6.5

Asahi-U-transferred PEN 15.6 0.87 0.60 8.1

Moth-eye-transferred PEN 14.1 0.87 0.62 7.7

nano tech 2009 2009 2 18

20 nano tech

Characteristics of Sumilite®TTR

®

®

®

®

Superstrate-type a-Si:H solar

cells

• 21 10 1 23 3 31 1

• 33

PVTEC 9

• CIGS

PVTEC

&

DIC

33

Q

Saes Getters S.p.A

YOCASOL

33

•

10 cm

•

1.1m 1.4m

• 4

18 cm 40 cm

•

1 40

85

30

200 300

Voc / Isc

Pmax / FF 30

/

PEN ®

UV