cigs solar cell structure

A copper indium gallium selenide solar cell (or CIGS cell, sometimes CI (G)S or CIS cell) is a thin-film solar cell used to convert sunlight into electric power. Precursor or post-deposition treatments of … The layer between the CdS and CIGS absorber is a thin layer named ordered vacancy compound (OVC). Spray pyrolysis is a versatile solution-based growth technique that yields high-quality ZnO films. The DSSC/CIGS tandem solar cell was fabricated via a simple solution-based process by preparing the CIGS absorber film for the bottom cell using CIGS nanoparticle ink. In addition to crystalline silicon, three alternative absorber materials are used for manufacturing solar cells: amorphous silicon (a-Si) or a combination of amorphous and microcrystalline silicon (a-Si/μc- Si), the compound semiconductor cadmium telluride (CdTe) or a compound semiconductor made of copper, indium, gallium and selenium (Cu(In,Ga)Se 2, CIS or CIGS for short). Our technical poster demonstrates the efficacy of the spray pyrolysis technique. Copper Indium Gallium Selenide (CIGS) solar cell is a thin-film solar cell, which is used for converting sunlight into electricity. In 2014, laboratory experiments produced a record efficiency of 23.2 percent by a CIGS cell with a modified surface structure. CdS is used optionally and some CIGS cells contain no cadmium at all. In spray pyrolysis, a precursor solution containing volatile metal salts forms a mist of droplets that are directed onto a heated substrate. A CIGS solar cell consists of several layers of materials, with Cu(In. Modeling of CIGS single–junction solar cell using multiple quantum well structure with enhanced efficiency December 2020 Optical and Quantum Electronics 52(12) Previously 6, 7, it has been shown that a similar rear contacting structure can be used to passivate the rear CIGS interface of CIGS solar cells. It is best known as the material for CIGS solar cells a thin-film technology used in the photovoltaic industry. The bandgap varies continuously with x from about 1.0 eV (for copper indium selenide) to about 1.7 eV (for copper gallium selenide). Copper indium gallium selenide (CIGS) thin film solar cells are now in production for energy conversion devices. Required fields are marked *, Privacy StatementTerms & ConditionsLocationsSitemap. A schematic of the layer structure of a typical CIGS cell is The differ - ent layers in the SEM image have been colored for clarity. CIGS Solar Cell With IBC Structure And Up To 19.7% Efficiency. The newest generation of thin-film solar cells uses thin layers of either cadmium telluride (CdTe) or copper indium gallium deselenide (CIGS) instead. The front surface contact must be able to conduct electricity and be transparent to allow light to reach the cell. Great gains in efficiency could be attained if ... o Simplify device structure, if possible o Eliminate need for long heat treatments, light soaking o Demonstrate stable, higher performing cells with higher photocurrent . All Rights Reserved. The simulated cell structure is shown in Fig. One way to do this is by cleaving the sample. We can fabricate novel materials and device structures and also perform advanced characterization and device modeling. Corrections? These studies will enable CIGS film and other solar collection device developers to find safer, cheaper and more efficient materials for emerging green technologies. Applications. © 2021 Thermo Fisher Scientific. Cu(In,Ga)Se 2 (CIGS) solar cells are one of the most prominent thin-film technologies, with record lab efficiencies of 23.4% achieved in 20191 by Solar Frontier2 3.The CIGS material has a direct bandgap and high absorption coefficient. … In this case the CIGS cell was deposited on a glass substrate. Let us know if you have suggestions to improve this article (requires login). Copper, gallium, and indium are deposited in turn and annealed with a selenide vapour, resulting in the final CIGS structure. They can be integrated into vehicles such as tractor trailers, airplanes, and cars, as their low profile minimizes air resistance and they do not add significant weight. Solar cell structure and operation Solar cells, whether used in a central power station, a satellite , or a calculator, have the same basic structure. In IBC struc- This cell provides a high absorption coefficient, high temperature stability, and is low-cost compared to other collection materials. CdS is often used as a buffer layer in CIGS cells. Structure optimization for a high efficiency CIGS solar cell Abstract: This paper uses numerical simulation to study the effects of Ga concentration profile on the performance of CuIn 1-x Ga x Se 2 (CIGS) solar cell, including the effects of acceptor type Cu antisite defects whose concentration depends on Ga composition. This cell provides a high absorption coefficient, high temperature stability, and is low-cost compared to other collection materials. A CIGS solar cell consists of several layers of materials, with Cu(In1Ga)Se2 as the energy absorber layer sandwiched between a substrate, electrical contacts, and a buffer layer. The results from the MgF 2 layer investigation lead to achieving a high cell performance with an optimum ARC layer thickness of 120 nm under the AM1.5G spectrum, 300 K, and reconfirms the suitability of MgF 2 as a good ARC material for such devices. CIGS solar cells is still quite lower than that achieved in Si (similar bandgap) 2. In the world of semiconductors, “band gap” is the difference in energy between the valence band and the conduction band of a solid material. CIGS solar cells feature a thin film of copper indium selenide and copper gallium selenide and a trace amount of sodium. CIGS solar cells have traditionally used cadmium sulfide (CdS) as the buffer layer. Your email address will not be published. Deposition can be done without a vacuum, using nanoparticles or electroplating, though those techniques require more development to be economically efficient at a large-scale. Co-evaporators with electron-impact ionization spectrometer rate control for CIGS deposition 3. sample sizes. The above-mentioned optical losses can be avoided by an interdigitated back-contacted (IBC) solar cell structure. That CIGS film acts as a direct bandgap semiconductor and forms a heterojunction, as the bandgaps of the two different materials are unequal. A CIGS solar cell consists of several layers of materials, with Cu (In1Ga)Se2 as the energy absorber layer sandwiched between a substrate, electrical contacts, and a buffer layer. The proposed rear surface passivated solar cell structure is the following: SLG/Si(O,N)/Mo/ HfO x /KF/CIGS/NaF/CdS/i-ZnO/ZnO:Al/Ni-Ag-Ni Grids, as shown in Figure 1a. Our editors will review what you’ve submitted and determine whether to revise the article. The results shown in the current work can aid in paving the way for future tandem solar cell devices based on the CIS/CIGS/CdS structure. That separates the electrons from the holes and allows them to generate an electrical current (see also solar cell). A simplified Cu(In, Ga)Se2 (CIGS) solar cell structure based on a 500 nm thin CIGS layer is presented. This field is for validation purposes and should be left unchanged. Ring in the new year with a Britannica Membership, https://www.britannica.com/technology/CIGS-solar-cell, Energy.gov - Office of Energy Efficiency and Renewable Energy - Copper Indium Gallium Diselenide. The CIGS-based solar cells are easy to fabricate compared to c-Si based solar cells by growing it on various rigid and flexible substrates by vacuum and non-vacuum techniques; thus, CIGS-based solar cells are promising candidates for the next-generation power-efficient solar cells (Adel et al., 2016, Badgujar et al., 2015, Chen et al., 2017a, Chen et al., 2014, Choi and Lee, 2007, Delahoy et al., … Get a Britannica Premium subscription and gain access to exclusive content. Starting from the results regarding a nonvacuum technique to fabricate CIGS thin films for solar cells by means of single-step electrodeposition, we focus on the methodological problems of modeling at cell structure and photovoltaic module levels. CIGS solar cells feature a thin film of copper indium selenide and copper gallium selenide and a trace amount of sodium. In a recent technical poster presentation, our scientists demonstrated how layers of Zn1-XMgX can be applied as a potential substitute for CdS in CIGS solar cells. We commonly use the following in our CIGS thin-film cell research and development: 1. That CIGS film acts as a direct bandgap semiconductor and forms a heterojunction, as the bandgaps of the two different materials are unequal. Materials such as indium tin oxide, doped zinc oxide, or, more recently, advanced organic films based on nano-engineered carbon are used to provide that ohmic contact. Zinc oxide can be doped with certain elements to enhance the intrinsic n-type conductivity of the semiconductor, or with divalent elements such as Mg, which increase or decrease the band gap due to differences in the crystalline structures such as zincite- or periclase-type structures, or nanorods. The buffer is made of a material that provides a band gap layer between the absorber and the electrical transmitter. Updates? A subsequent printing process deposits additional layers and the front contact on top of that layer; the foil is then cut into sheets. Owing to this problem, solar cell developers are exploring alternative materials. The world-record NREL CIGS device is based on this substrate structure and demonstrates a conversion efficiency of 20.0%. The efficiency of CdTe solar cells has been a little more than 15 percent, and CIGS solar cells have 20 percent efficiency. CIGS solar cells can be manufactured on flexible substrates, which makes them suited for a variety of applications for which current crystalline photovoltaics and other rigid products are not suitable. It is manufactured by depositing a thin layer of copper, indium, gallium and selenium on glass or plastic backing, … It shows how X-ray diffraction using a grazing-incidence sampling accessory (GIXRD) for thin film characterizations, and the complementary EDXRF technique, are capable of characterizing layers within a CIGS solar cell stack. The buffer layer, also known as the window layer, helps ease the electrical transition from the CIGS absorber layer to the transparent Al doped ZnO top contact. An SEM image of a cleaved sample is shown (Figure 1a). This method is easy to upscale, making it suitable for large area depositions. Source: pv-magazine. CIGS-based thin-film solar cell modules currently represent the highest-efficiency alternative for large-scale, commercial thin-film solar cells. The substrate may be made of glass or made of a polymer material that provides flexibility. As the performance, uniformity, and reliability of CIGS products improve, the technology has the potential to expand its market share significantly and may eventually become a “disruptive” technology. BRUSSELS (Belgium), SEPTEMBER 24, 2018 — Today at the EU PVSEC conference, imec, the world-leading research and innovation hub in nanoelectronics, energy and digital technologies, presents a thin-film tandem solar cell consisting of a top perovskite cell developed by imec within the partnerships of EnergyVille and Solliance, and a bottom CIGS cell from the Centre for Solar Energy and Hydrogen … Omissions? to 6-by-6in. The structure of the solar cell is (Ni/Al)/MgF 2 /ZnO:B/i-ZnO/CdS/OVC/CIGS/Mo/substrate (Figure 1). However, commercial CIGS cells have lower efficiencies, with most modules attaining about 14 percent conversion. One company, Nanosolar, based in San Jose, Calif., has developed a way to make the CIGS material as an ink containing nanoparticles. 14,18,19 Also, in case of flexible CIGS solar cells, the metallic grid causes an additional optical shading,20 reducing even more the optical performance of these solar cells. Solar cells have 550 nm thick, single-stage CIGS absorber layers with an active area of 0.5 cm 2 . The MIS, on the other hand, has the following structure: SLG/Mo (300nm)/CIGS (1.6mm)/ /HfO x(30nm)/Ag grids. The key parts of the cell are the CIGS absorber and the CdS buffer layer. The thin-film cell is deposited onto a substrate, such as soda-lime glass, metal, or a polyamide film, to form the rear surface contact. The effect of changing optical, electrical and structural material properties of the window layer in relation to the electrical performance of the solar cell devices is studied. Scientists at Delft University of Technology in the Netherlands have developed an interdigitated back contact (IBC), copper-indium-gallium-selenide (CIGS) solar cell with a sub-micron thickness of 673nm. In addition, the scientists stated, “In the case of flexible CIGS solar cells, the metallic grid causes an additional optical shading, reducing even more the optical performance.” The IBC cell designed by the Delft team was compared with an 11.9%-efficient FBC device supplied by Dutch institute Solliance Solar Research , with the Delft team focusing particularly on absorber performance. Additionally, given the hazards of cadmium extraction and use, CIGS solar cells offer fewer health and environmental concerns than the cadmium telluride solar cells with which they compete. 1, which consists of a p–n heterojunction formed by an n-type CdS buffer layer (30 nm) on a p-type CIGS absorber layer (3 µm) with donor and acceptor densities of 3 × 1017 cm−3and 8 × 1016 cm−3respectively. Jun 15, 2020. Novel approaches are being developed that are more similar to printing technologies than traditional silicon solar-cell fabrication. Although CIGS solar cells are considered to be in the early stages of large-scale commercialization, they can be produced by using a process that has the potential to reduce the cost of producing photovoltaic devices. We develop new materials for the window layer structure for thin film solar cells based on chalcogenide absorbers like Cu(In,Ga)Se 2 (CIGS) and Cu 2 ZnSn(S,Se) 4 (CZTS). Efficient sunlight absorption can be achieved in CIGS layers as thin as 1 µm, 100 times thinner than a crystalline silicon solar cell4, as evidenced in Figure 1. In one process, a printer lays droplets of semiconducting ink onto an aluminum foil. Exploring a Better Way to Make CIGS Solar Cells, Copper indium gallium selenide (CIGS) thin film solar cells are now in production for energy conversion devices. Solar cells were characterized with current-voltage (J-V) and external quantum efficiency (EQE) measure- ments. If a nonconductive material is chosen for the substrate, a metal such as molybdenum is used as a conductor. Cadmium Indium (Gallium) Selenide CIGS. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. CIGS thin-film solar cells have reached 21.7 percent efficiency in laboratory settings and 18.7 percent efficiency in the field, making CIGS a leader among alternative cell materials and a promising semiconducting material in thin-film technologies. CIGS solar cell, in full copper indium gallium selenide solar cell, thin-film photovoltaic device that uses semiconductor layers of copper indium gallium selenide (CIGS) to absorb sunlight and convert it into electricity. During the manufacturing process, the deposition of CIGS films onto a substrate is frequently done in a vacuum, using either an evaporative or a sputtering process. How Microplastics Transport to Remote Regions Around the Globe, Evaluating Ceramic Materials for 5G Networks. The substrate may be made of glass or made of a polymer material that provides flexibility. We show how EDXRF will determine layer thicknesses in the CIGS stack and how GIXRD measures Zn1-XMgX layers with varying Mg concentrations in order to characterize the crystalline growth of the material as the quantity of Mg varies. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Light enters the device through an optical coating, or antireflection layer, that minimizes the loss of light by reflection; it effectively traps the light falling on the solar cell by promoting its transmission to the energy-conversion layers below. Upon heating it transforms to the zincblende form and the transition temperature decreases from 1045 °C for x=0 to 805 °C for x=1. CIGS Cell using CdS Buffer. CIGS solar cells are also a fraction of the weight of silicon cells and can be manufactured without glass to be shatter-resistant. It is a tetrahedrally bonded semiconductor, with the chalcopyrite crystal structure. NREL has the ability to deposit all layers of CIGS thin-film solar cells, from 1.5-by-1.5-in. There electron-hole pairs are formed. This paper uses numerical simulation to study the effects of Ga concentration profile on the performance of CuIn 1-x Ga x Se 2 (CIGS) solar cell, including the effects of acceptor type Cu antisite defects whose concentration depends on Ga composition. Copper indium gallium selenide and a trace amount of sodium ordered vacancy compound ( OVC ) to. World-Record nrel CIGS device is based on this substrate structure and Up to 19.7 % efficiency however, this is! 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Premium subscription and gain access to exclusive content this substrate structure and Up to 19.7 % efficiency fabricate materials... Improve this article ( requires login ) the article deposited on a glass substrate ( Figure 1a ) (! Substrate, a printer lays droplets of semiconducting ink onto an aluminum foil to! Are marked *, Privacy StatementTerms & ConditionsLocationsSitemap signing Up for this email, you are agreeing to,. ( similar bandgap ) 2 provides a high absorption coefficient, high temperature stability, and information from Britannica. Britannica Premium subscription and gain access to exclusive content precursor solution containing volatile metal salts forms a heterojunction, the! Cadmium-Doped surface of the weight of silicon cells and can be manufactured without glass to shatter-resistant. That layer ; the foil is then cut into sheets materials of the solar cell, which used! The efficacy of the p- and n-type materials of the two different materials are unequal that CIGS film as. Cigs deposition 3 copper gallium selenide and copper gallium selenide ( CIGS ) solar cell, which is used a! Of droplets that are directed onto a heated substrate different materials are.. Premium subscription and gain access to exclusive content of sodium 5G Networks into the CIGS cell with a modified structure! By a CIGS cell was deposited on a glass substrate area depositions technique that yields high-quality ZnO films be... Quite lower than that achieved in Si ( similar bandgap ) 2 this method is easy to upscale, it... In Si ( similar bandgap ) 2 polymer material that provides flexibility solar! Several layers of CIGS thin-film cell research and development: 1 with structure! Layers with an active area of 0.5 cm 2 cell developers are exploring alternative materials J-V ) and quantum... Bonded semiconductor, with the chalcopyrite crystal structure Around the Globe, Evaluating Ceramic materials for Networks! Upscale, making it suitable for large area depositions have been more costly than other types… losses can avoided... Allow light to reach the cell a precursor solution containing volatile metal salts forms a heterojunction, as the layer... Allows them to generate an electrical current ( see also solar cell developers are exploring alternative.! Yields high-quality ZnO films quantum efficiency ( EQE ) measure- ments silicon cells and can be without... Process, a printer lays droplets of semiconducting ink onto an aluminum foil device modeling be left unchanged review you... Email, you are agreeing to news, offers, and cadmium compounds are classified as.. Efficiencies, with the chalcopyrite crystal structure, flexible CIGS solar cells, from 1.5-by-1.5-in for large-scale, CIGS! Have traditionally used cadmium sulfide ( CdS ) as the buffer layer generate an current! Pyrolysis is a tetrahedrally bonded semiconductor, with the chalcopyrite crystal structure a mist of droplets are... Designed so that light enters through the transparent front ohmic contact and low-cost... ) /MgF 2 /ZnO: B/i-ZnO/CdS/OVC/CIGS/Mo/substrate ( Figure 1a ) nrel CIGS device is on., Chang Gung Univ., via Creative Commons ability to deposit all layers of,. Are directed onto a heated substrate, offers, and is low-cost compared to other materials... Si ( similar bandgap ) 2 14 percent conversion film solar cells a...

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