NanoMarkets sees broader adoption of both BIPV and CIGS hinging on a trade-off between cost and reliability, with lower-cost encapsulations emerging that offer minimal performance. We also note that transparency of the barrier also is very important, since any light obstruction directly reduces the performance of the PV cells within; we expect competition on this front as well.

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Translating CIGS Efficiency Improvements into Market
Opportunity
Any PV technology that hopes to compete with c-Si in today’s solar energy
world must solve several problems: raise conversion efficiencies to around
those of silicon-based cells (at least 20 percent), lower costs below that of c-Si
(roughly $0.40-$0.50/Watt), or find specific niche markets where an alternative
PV technology's features and capabilities are an acceptable tradeoff for lower
cost/performance, such as flexibility.
In the past few months, the thin-film CIGS sector has made impressive
progress in solving part of that equation. It's eclipsed the top efficiency mark of
polysilicon-based cells (20.4 percent), and hasn't looked back:
• Solar Frontier reached 20.9 percent efficiency on a 0.5 x 0.5cm cell in
April. That's just a tick above the previous CIGS PV record (20.8
percent) achieved last October by the Center for Solar Energy at Baden-
Wurttemberg (ZSW), and it's also a record for single-junction thin-film
PV.
• Hanergy's Solibro unit hit 20.5 percent efficiency in the lab in April,
adding nearly a full percent to its 19.6 percent mark reached in
December. Last October Hanergy also achieved 15.5 percent for
commercially available glass PV modules built with technology from
Miasole, another of its recent CIGS acquisitions.
• In May, CIGS tool manufacturer Midsummer touted 16.2 percent
(aperture area) for full-size 156 x 156 cm solar cells, and notably in
implementation in a production line.
• In February, Stion claimed it built a prototype 23.2 percent cell (20 x 20
cm) for its tandem-junction technology, eyeing monolithic modules with
efficiency around 20-22 percent.

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• Siva Power announced an 18.8 percent efficient module also in
February, just 10 months into its repositioning into a CIGS company.
• And yet again in February – a busy month -- Avancis reported a 16.6
percent efficient CIGS module (aperture area, not "total area") on a
30x30 cm module.
Generally speaking, the higher CIGS efficiencies go, the more market
opportunities open up, bringing CIGS closer to competing with c-Si (and better
than other thin-film PV) on a number of fronts. With these Gen II thin-film CIGS
versions, NanoMarkets projects CIGS on a path to equivalence with c-Si
efficiencies by 2018-2019, at which point the question will no longer about
efficiency, but purely price/value — and CIGS should be able to beat c-Si as it
ramps to volume, due to far lower absorber material usage.
Flexible CIGS and BIPV
While progressively solving that higher efficiency/lower cost riddle, CIGS
vendors also must leverage markets where CIGS technology has inherent
advantages over both c-Si and other thin-film PV technologies. CIGS' ever-
improving efficiency means significantly more power and efficiency for rigid
building-integrated PV (BIPV) products, and the technology uses a fraction of
the material vs. c-Si for power generation -- but if electricity is the main goal,
rooftop-affixed c-Si solar panels will always be the cheaper and preferred
option.
CIGS’ differentiator, then, comes down to its long-appreciated ability to be
produced on flexible substrates. Portable charging applications were an early
area of opportunity for CIGS (and other technologies), from backpacks and
tents to devices to clothing. NanoMarkets sees significant opportunities for
flexible CIGS PV manufacturers in these applications with increasingly broad
consumer appeal, emphasizing the technology’s functionality (ever higher
efficiencies mean increased power generation), convenience, and style, either
by developing their own products or linking up with high-end consumer
products manufacturers. Global Solar (now Hanergy) and Ascent Solar are two
examples of CIGS companies that are focused exclusively on portable charging
stations.

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CIGS and BIPV: The Market Awaits
However, the most promising market volumes and revenues for thin-film CIGS
PV continue to be BIPV applications, where c-Si is not an option and the only
other competitor (amorphous silicon) has a significant efficiency disadvantage.
A prominent example is Dow's PowerHouse shingle, which uses CIGS
absorber material from Global Solar/Hanergy. Launched in 2011, Dow’s
Powerhouse shingles have made steady inroads into BIPV; they are now
available in 17 U.S. states and Canada (where the first system went online in
June), and have become more successful than previous a-Si-based products.
As cost/Watt continues to decline, these solar shingles (from Dow and others)
are becoming viable for a broader consumer audience. NanoMarkets expects
this to become a very profitable sector, evolving into just another regular option
both for new home construction and re-roofing projects.
We also continue to see great opportunities for flexible CIGS in BIPV laminates,
glued onto everything from roofs to façades to doors and fences depending on
architectural or technical concerns, or even standalone laminates. This not only
enables simpler and efficient installation, potentially installed by building owners
themselves, it would help distribute costs through the materials that would be
used anyway, making BIPV investments more attractive.
The key for CIGS PV manufacturers in flexible BIPV is to create products that
have mass-market appeal (such as solar shingles), intimately connecting the
PV components and building materials, to help share costs. This will make PV
more accessible to more users, and help blend the cost of PV systems so it's
more economical to install.
The Encapsulation Conundrum: Finding a Balance
There's a caveat with increased usage of flexible CIGS PV technology: long-
term reliability, and its sensitivity to moisture more so than other thin-PV
technologies. This is particularly a concern in BIPV applications which are
generally outdoors and exposed to the elements for (ideally) decades. Rigid PV
products (including conventional PV panels) are encapsulated in impermeable
glass, but this isn’t an option for flexible CIGS, and “flexible glass,” despite
eyeing various new markets of late, has yet to live up to its promises.

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Companies leading the development in this area (all of which involve dyad
films, multiple layers of organic and inorganic materials) include Dow Chemical,
Fujifilm, 3M, and DuPont. Over the next few years, NanoMarkets expects more
materials companies to develop and commercialize their own versions of dyad
films, perhaps using different deposition techniques and different component
materials, attempting to reduce the cost and complexity of these barrier
systems. Some of the extra cost of these flexible encapsulation solutions can
be borne through the higher value affixed to BIPV.
NanoMarkets sees broader adoption of both BIPV and CIGS hinging on a
trade-off between cost and reliability, with lower-cost encapsulations emerging
that offer minimal performance. We also note that transparency of the barrier
also is very important, since any light obstruction directly reduces the
performance of the PV cells within; we expect competition on this front as well.
The materials for this paper were drawn from the following NanoMarkets reports:
• CIGS Photovoltaics Markets-2014 and Beyond
• BIPV Glass Markets-2014 & Beyond
• BIPV Markets Analysis and Forecasts 2014-2021
• Dye Sensitized Cell Markets - 2014
Please visit www.nanomarkets.net for additional details