TFT2010.10.21
OJT OJT
A B C
8 10 I 12006.6.1 2008.3.31
NIPPON GOHSEI : 2 : 2008.4.1~2010.3.31
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
Stepping roll deposition system CVD & Sputtering Chambers
(USA) 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
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)Se 2 ) flexible modules Roll-to-roll, co-evaporation, 13.2% on SUS, 11.3% on PI Global Solar Energy (USA) Roll-to-roll, screen printing of nanoparticle ink Nanosolar (USA)
Flexible ceramic substrate CIGS growth temperature 550 Substrate (%) V oc (/cell) (V) J sc (ma/cm 2 ) FF Ap. area (cm 2 ) 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. 10 10 cm 2 size 200- m thick ceramic substrate submodule (17 cells, ap. area 75.7cm 2 )
Flexible light-through spherical crystalline Si solar cells Kyosemi
Flexible organic thin-film solar cell modules 20-nm p-phthalocyanine 50-nm n-c 60 AIST, Tokki Corp., Mitsubishi Corp.
Toin University of Yokohama Full-plastic DSC module Thickness: 0.5 mm Weight: 0.8 kg/m 2 Output: >110V 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 Monomer (Liquid) UV Polymer (Solid) Tg >200 o C Transparency 92% Coefficient of Thermal Expansion 63 ppm Elastic modulus 4.3 GPa (30 o C) 2.1 GPa (200 o C)
NIPPON GOHSEI PEN
Coat by acrylic monomer Lamination Film UV-curing (or/and heat) Remove Textured plastic film roll Asahi-U 2p(2 parts) Film 300 nm 150 nm AFM image
AFM RMS = 38nm 2p RMS = 38nm PEN Asahi-U TCO RMS = 39nm 2p RMS = 38nm 2p
PV Japan 2008
- PEN
PI PEN
Substrate J sc (ma/ cm 2 ) V oc (V) Fill factor Efficiency (%) Asahi-U 15.7 0.88 0.59 8.2 Asahi-Utransferred PI 15.0 0.84 0.65 8.3 Flat PI 11.7 0.83 0.68 6.5 Asahi-Utransferred PEN 15.6 0.87 0.60 8.1 Moth-eyetransferred 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 10 123 3 31 1 33 PVTEC9 CIGS PVTEC
& DIC 33 Q Saes Getters S.p.A YOCASOL
33
10 cm 1.1m 1.4m
4 18 cm40 cm
140 85 30
200 300
Voc / Isc Pmax / FF 30 /
PEN UV