![]() Performing this process with extreme delicacy will result in high-quality c-Si layers, which translates to higher efficiency.ĭuring the wet-chemical processing, organic and metal impurities are removed from the c-Si wafer. The wafer processing involves cutting the c-Si cells with a diamond-based saw. There are several steps involved in the manufacturing process of the heterojunction solar cell. Manufacturing of a heterojunction solar cell The number of TCO layers varies depending on the HJT cell being monofacial or bifacial, with the rear layer being a metal layer acting as the conductor for monofacial heterojunction cells. The absorber layer of the heterojunction solar cell encloses a c-Si wafer-based layer (blue layer) placed between two thin intrinsic (i) a-Si:H layers (yellow layer), with doped a-Si:H layers (red & green layers) placed on top of each a-Si:H (i) layer. Structure of HJT solar cell - Source: De Wolf, S. HJT technology, instead, combines wafer-based PV technology (standard) with thin-film technology, providing heterojunction solar cells with their best features. Standard (homojunction) solar cells are manufactured with c-Si for the n-type and p-type layers of the absorbing layer. Structure of the heterojunction solar cell The reflectivity and conductivity properties of ITO make it a better contact and external layer for the HJT solar cell. ![]() Indium Tin Oxide is the preferred material for the transparent conductive oxide (TCO) layer of the heterojunction solar cell, but researchers are investigating using indium-free materials that will reduce costs for this layer. While a-Si on itself has density defects, applying a hydrogenating process solves them, creating hydrogenated amorphous silicon (a-Si:H), which is easier to dope and has a wider bandgap, making it better for creating HJT cells. There are two varieties of c-Si, polycrystalline and monocrystalline silicon, but monocrystalline is the only one considered for HJT solar cells since it has a higher purity and therefore more efficient.Īmorphous silicon is used in thin-film PV technology and is the second most important material for manufacturing heterojunction solar cells. There are three important materials used for HJT cells:Ĭrystalline silicon is regularly used to create standard homojunction solar cells, seen in conventional panels. Materials required to manufacture a heterojunction solar cell ![]() To understand the technology, we provide you with a deep analysis of the materials, structure, manufacturing, and classification of the HJT panels. Heterojunction solar panels are assembled similarly to standard homojunction modules, but the singularity of this technology lies in the solar cell itself. ![]() Looking into the future of heterojunction technology.Limited space applications (Solar shingles & BIPV).Typical applications of heterojunction solar technology.Summing up: What benefits do heterojunction panels offer?.How do heterojunction solar panels work?.Classification of heterojunction solar cells.Manufacturing of a heterojunction solar cell.Structure of the heterojunction solar cell.Materials required to manufacture a heterojunction solar cell.
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