Solar Frontier Kabushiki Kaisha is a Japanese

photovoltaic Photovoltaics (PV) is the conversion of light into electricity using semiconducting materials that exhibit the photovoltaic effect, a phenomenon studied in physics, photochemistry, and electrochemistry. The photovoltaic effect is commercially us ...

company that develops and manufactures

thin film solar cell A thin-film solar cell is a second generation solar cell that is made by depositing one or more thin layers, or thin film (TF) of photovoltaic material on a substrate, such as glass, plastic or metal. Thin-film solar cells are commercially use ...

s using CIGS technology. It is a fully owned subsidiary of

Showa Shell Sekiyu was a Japanese company that operated as a subsidiary of Royal Dutch Shell until it was acquired by Idemitsu Kosan in 2018 and integrated into the company the following year. It was formed by the merger of Showa Oil Company and Shell Sekiyu which w ...

and located in

Minato, Tokyo is a special ward in Tokyo, Japan. It is also called Minato City in English. It was formed in 1947 as a merger of Akasaka, Azabu and Shiba wards following Tokyo City's transformation into Tokyo Metropolis. The modern Minato ward exhibits th ...

, Japan. The company was founded in 2006 as Showa Shell Solar, and renamed Solar Frontier in April 2010.

Background

Solar Frontier's parent company Showa Shell Sekiyu had been involved with solar energy since 1978. Production on a commercial scale of crystalline silicon modules for solar cells began in 1983, and research on CIS (copper-indium-selenium) technology began in 1993.

Manufacturing plants

Solar Frontier has manufacturing plants in

Miyazaki Prefecture is a prefecture of Japan located on the island of Kyūshū. Miyazaki Prefecture has a population of 1,073,054 (1 June 2019) and has a geographic area of 7,735 km2 (2,986 sq mi). Miyazaki Prefecture borders Ōita Prefecture to the north, Kuma ...

, where it develops and manufactures CIS solar panels, that combine CIGS and CIGSe materials. The company emphasizes the fact that it uses neither

cadmium Cadmium is a chemical element with the symbol Cd and atomic number 48. This soft, silvery-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Like zinc, it demonstrates oxidation state +2 in most of ...

(Cd) nor

lead Lead is a chemical element with the symbol Pb (from the Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cu ...

(Pb) for its cells. CIGS technology often uses a thin (< 50 nm)

CdS The compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings. In August 1982, the first compact disc was manufactured. It was then released in Octo ...

buffer layer, and the

semiconductor A semiconductor is a material which has an electrical resistivity and conductivity, electrical conductivity value falling between that of a electrical conductor, conductor, such as copper, and an insulator (electricity), insulator, such as glas ...

material of rival

CdTe Cadmium telluride (CdTe) is a stable crystalline compound formed from cadmium and tellurium. It is mainly used as the semiconducting material in cadmium telluride photovoltaics and an infrared optical window. It is usually sandwiched with cadmi ...

-technology itself contains the toxic

(Cd), while conventional

crystalline silicon Crystalline silicon or (c-Si) Is the crystalline forms of silicon, either polycrystalline silicon (poly-Si, consisting of small crystals), or monocrystalline silicon (mono-Si, a continuous crystal). Crystalline silicon is the dominant semicondu ...

modules use a lead-containing

solder Solder (; NA: ) is a fusible metal alloy used to create a permanent bond between metal workpieces. Solder is melted in order to wet the parts of the joint, where it adheres to and connects the pieces after cooling. Metals or alloys suitable ...

material. The company's largest plant is located at Kunitomi and has been operating since its soft opening in February, 2011, with a production capacity of close to 1 GW per year (900 MW). In April 2015, Solar Frontier completed the construction of its fourth production plant, the 150-megawatt Tohoku Plant, in Ōhira,

Miyagi Prefecture is a prefecture of Japan located in the Tōhoku region of Honshu. Miyagi Prefecture has a population of 2,305,596 (1 June 2019) and has a geographic area of . Miyagi Prefecture borders Iwate Prefecture to the north, Akita Prefecture to the nort ...

, which started commercial production in June 2016. The latest CIS line technology includes

solar module A solar cell panel, solar electric panel, photo-voltaic (PV) module, PV panel or solar panel is an assembly of photovoltaic solar cells mounted in a (usually rectangular) frame, and a neatly organised collection of PV panels is called a photo ...

s with conversion efficiencies of over 15%. When compared to the Kunitomi Plant, the Tohoku Plant requires only two-thirds the investment and manpower per megawatt. It also requires only one-third the time to manufacture a CIS solar panel.

CIS technology

CIS stands for the key ingredients

copper Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkis ...

indium Indium is a chemical element with the symbol In and atomic number 49. Indium is the softest metal that is not an alkali metal. It is a silvery-white metal that resembles tin in appearance. It is a post-transition metal that makes up 0.21 parts p ...

and

selenium Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, ...

. CIS technology, however, uses a material that is a mixture of a

solid solution A solid solution, a term popularly used for metals, is a homogenous mixture of two different kinds of atoms in solid state and have a single crystal structure. Many examples can be found in metallurgy, geology, and solid-state chemistry. The word ...

of CIS (CuInSe) and CGS (CuGaSe) containing the element

gallium Gallium is a chemical element with the symbol Ga and atomic number 31. Discovered by French chemist Paul-Émile Lecoq de Boisbaudran in 1875, Gallium is in group 13 of the periodic table and is similar to the other metals of the group (aluminiu ...

. Depending on the ratio of CIS and CGS the chemical formula for the resulting CIGS

semiconductor material A semiconductor is a material which has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals behave in the opposite way. ...

is written as CuIn_xGa_(1-x)Se₂, where the value of x can vary from 1 (pure CIS) to 0 (pure CGS). In addition, Solar Frontier's semiconductor also contains

sulfur Sulfur (or sulphur in British English) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula ...

. It is a

tetrahedral In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the o ...

bond Bond or bonds may refer to: Common meanings * Bond (finance), a type of debt security * Bail bond, a commercial third-party guarantor of surety bonds in the United States * Chemical bond, the attraction of atoms, ions or molecules to form chemica ...

ed semiconductor, with the

chalcopyrite Chalcopyrite ( ) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS2 and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mo ...

crystal structure. The

bandgap In solid-state physics, a band gap, also called an energy gap, is an energy range in a solid where no electronic states can exist. In graphs of the electronic band structure of solids, the band gap generally refers to the energy difference (in ...

varies continuously with ''x'' from about 1.0 eV (for copper indium selenide) to about 1.7 eV (for copper gallium selenide). Solar Frontier underlines the fact that their CIS modules generate a higher energy yield (kilowatt-hours per kilowatt-peak) in real world conditions than conventional

modules.

References

{{reflist Japanese companies established in 2006 Manufacturing companies based in Tokyo Photovoltaics manufacturers Solar energy companies of Japan Shell plc Electrical engineering companies of Japan Thin-film cell manufacturers Japanese brands

Background

Manufacturing plants

CIS technology

See also

References