{"id":585,"date":"2026-07-22T04:30:18","date_gmt":"2026-07-22T01:30:18","guid":{"rendered":"https:\/\/yemen-solar.com\/?p=585"},"modified":"2026-07-22T04:30:18","modified_gmt":"2026-07-22T01:30:18","slug":"qcells-secures-tuv-rheinland-certification-for-perovskite-silicon-tandem-technology","status":"publish","type":"post","link":"https:\/\/yemen-solar.com\/?p=585","title":{"rendered":"Qcells Secures T\u00dcV Rheinland Certification for Perovskite-Silicon Tandem Technology"},"content":{"rendered":"
\n

\nQcells Receives T\u00dcV Rheinland Accreditation for Perovskite and Silicon Tandem Technology<\/h1>\n

\nQcells has achieved an important step in the transition of tandem solar cells from the laboratory to commercial manufacturing, after its technology based on perovskite and silicon received accreditation from T\u00dcV Rheinland, after passing a series of reliability tests and environmental stress according to international requirements for solar modules.<\/p>\n

This achievement represents an important development in the solar industry, because the biggest challenge for perovskite cells is no longer just to achieve high efficiency in the laboratory, but to be able to withstand the heat, humidity, ultraviolet radiation and frequent thermal changes throughout the years of operation. While efficiency indices attract the attention of researchers and the media, reliability and long-term stability are the decisive factors in determining whether the technology can be turned into a commercial product that can be financed and installed by factories.<\/p>\n

\nThe importance of the achievement lies not only in the high efficiency, but in proving that the technology of perovskite and silicon tandem has become closer to meeting the reliability requirements necessary for commercial production and global markets.<\/p><\/blockquote>\n

\nLatest News: Independent accreditation from T\u00dcV Rheinland<\/h2>\n

Qcells announced in July 2026 that its Tandem Solar Cells and Modules technology has received accreditation from the Foundation. T\u00dcV Rheinland<\/strong>, after independent verification of passing tests based on the requirements of the two standards IEC 61215<\/strong> And…UL 61215<\/strong>These criteria are used to assess the ability of solar modules to withstand extreme environmental conditions, such as high humidity, frequent temperature changes, UV exposure, and stresses that the module may experience during its operational life. This certification does not mean that the technology has necessarily reached full-scale commercial production, but it does confirm that Qcells has passed one of the most difficult stages facing perovskite technologies, the stability and reliability demonstration stage under standard test conditions. The importance of advertising is increased by the fact that the cells and units evaluated were not just small laboratory samples, but were developed using manufacturing processes aimed at future scalability and industrial production.<\/p>\n

\nWhy is adoption more important than just an efficiency number?<\/h2>\n

Achieving high efficiency in the laboratory is a fundamental scientific step, but it is not enough on its own to launch a commercial product. A solar cell or module that achieves high efficiency on a test day should also be able to maintain a significant proportion of its performance after long years of exposure to the sun, heat, humidity, wind, and seasonal changes. Solar modules undergo harsh tests that simulate long operating conditions. These tests help to detect problems such as material degradation, loss of adhesion under layers, moisture leakage, and deterioration of conduction. Certification is also key for investors, banks, insurers and project developers, as they need independent evidence that the new technology won\u2019t lose performance quickly after installation.<\/p>\n

\nDecember 2024: 28.6% efficiency achieved<\/h2>\n

The most prominent phase of the Qcells track began when the company announced in December 2024 achieving a conversion efficiency of 28.6%<\/strong> for a tandem solar cell of perovskite and silicon. The cell has the distinction of being made on a large silicon substrate of class M10<\/strong>This aspect is important because many of the standard efficiency figures are achieved on small-area cells and in precise laboratory conditions, while the process of maintaining homogeneity and efficiency becomes more difficult when moving to large areas. The 28.6% result showed that Qcells could not only improve the physical properties of perovskites, but also integrate them with the top layer.<\/p>\n

\nMay 2025: Passing Critical Stress Tests<\/h2>\n

In May 2025, Qcells announced that its tandem units had passed a series of critical stress tests, in a move that moved the debate from cell efficiency to the unit’s full capacity to withstand environmental operating conditions.<\/p>\n

\n
    \n
  • Pre-exposure to UV radiation:<\/strong> To check the effect of ultraviolet radiation in materials, layers and packaging.<\/li>\n
  • 200 Thermal Cycles:<\/strong> The unit alternates between low and high temperatures for repeated expansion and contraction testing.<\/li>\n
  • 10 cycles of moisture and freezing:<\/strong> To assess the unit’s ability to withstand the transition between high humidity and freezing temperatures.<\/li>\n
  • 1000 hours of wet heat:<\/strong> It is a long test under high temperature and humidity to accelerate the emergence of potential degradation mechanisms.<\/li>\n<\/ul>\n<\/div>\n

    These tests are especially important in the case of perovskites, because the material is known to be sensitive to moisture, heat, oxygen and environmental stresses, compared to crystalline silicon, which has a decades-long operating record. Passing unit-level tests is more challenging than passing them at the cell level, because the unit includes glass, packaging materials, edges, electrical connections and protective layers, all of which must work together to protect cells and maintain their performance.<\/p>\n

    \nJuly 2026: Transition from Test to Accreditation<\/h2>\n

    The July 2026 announcement adds a new dimension to the 2025 results. It is no longer just a matter of the company announcing that its units have passed internal or pilot tests. Performance is being achieved and certified by an independent international body, T\u00dcV Rheinland. This means that the development path is closer to the procedures that conventional solar modules go through before entering the market. Accreditation also gives greater confidence that the results are not just a single experiment, but part of an organized industrial development program. There are still stages related to increasing productivity, improving manufacturing yields, reducing the cost of materials, and ensuring homogeneity among millions of cells and units.<\/p>\n

    \nHow does a tandem solar cell work?<\/h2>\n

    A tandem cell is made up of two different solar cells that work on top of each other to exploit wider parts of the solar spectrum. At the top is a layer of perovskite with a higher energy gap, whose task is to absorb higher energy and shorter wavelength photons. The lower energy and longer wavelength photons pass through the perovskite layer to the silicon cell below. In this way, each layer absorbs the part of the spectrum that fits its electron demand, instead of the electron.<\/p>\n

    \n

    Upper layer of perovskite:<\/strong> It absorbs high-energy light, especially at the visible part and shorter wavelengths.<\/p>\n

    The lower cell of silicon:<\/strong> Longer photons absorb a wave that passes through the perovskite layer.<\/p>\n<\/div>\n

    High-energy photons lose part of their energy in the form of heat when absorbed by the silicon cell, while lower-energy photons pass through their energy gap without generating electrical current. In tandem cells, the perovskite layer uses a higher energy gap to exploit high-energy photons more efficiently, while silicon continues to perform its excellent role in absorbing longer-wave light.<\/p>\n

    \nWhy was Perovskite so hard to reach the market?<\/h2>\n

    Perovskite cells have achieved rapid efficiency development within a short period of time, but long-term stability has remained one of the biggest challenges to their commercial spread. Matter can be affected by moisture, heat, oxygen and ultraviolet radiation, and can cause ion movement or changes in crystal structure under operating conditions. In tandem cells, the task is made more difficult because perovskite must operate on top of the silicon cell without adversely affecting the substrates. The complete structure should also bear the packaging, delivery and lamination processes used in the manufacture of the units, and maintain their performance after long exposure to the external environment.<\/p>\n

    \nWhat does achievement mean for the solar industry?<\/h2>\n

    Qcells\u2019 achievement indicates that competition in the field of tandem cells is gradually moving from the laboratory efficiency race to the manufacturing, reliability and cost race. The next stage will be decided not only by the highest efficiency recorded, but by the ability of companies to produce large and homogeneous cells at industrial speeds, with a high proportion of sound products and competitive cost.<\/p>\n

    \n
      \n
    • The manufacturing of millions of cells of comparable quality.<\/li>\n
    • Minimize defects and production losses within manufacturing lines.<\/li>\n
    • Ensure stability for long running periods.<\/li>\n
    • Reduce the cost of perovskite materials, interlayers and packaging.<\/li>\n
    • Gain the trust of banks, insurance companies and project developers.<\/li>\n
    • Achieve a higher capacity than the space itself compared to conventional units.<\/li>\n<\/ul>\n<\/div>\n

      \nHigher capacity than the space itself<\/h2>\n

      An important advantage of tandem units is that they can produce more capacity than conventional silicon units. This advantage is important in applications where space is limited or expensive, such as rooftops, industrial plants, vehicles, and urban applications. Increasing capacity per square meter may also reduce some non-cell-related costs, such as structures, cables, land, and installation work, because the project can achieve the required capacity using fewer units or a smaller area. But the final economic value will depend on the unit\u2019s price, rate, and lifetime.<\/p>\n

      \nWhere do Qcells stand among competitors?<\/h2>\n

      Qcells is one of the largest companies working on the development of tandem perovskite and silicon cells, but it is not the only one in this race. Multiple companies and research centers are working to raise efficiency, improve stability and transfer technology to industrial sizes, including LONGi, Oxford PV and other European, Asian and American institutions. Some companies continue to focus on combining efficiency records, while others focus on experimental production lines or early commercial units. This balance between performance, stability and manufacturing will determine which companies are able to move from technical advertising to real commercial production.<\/p>\n

      \nDoes this mean that perovskite will replace silicon?<\/h2>\n

      In the near term, perovskite is not expected to completely replace silicon, but will be used to enhance its performance by placing perovskite layer on top of the silicon cell. Silicon has a huge industrial base, mature supply chains and long operating experience, so integrating perovskite with it is a less risky path than building a completely separate new industry. The tandem structure allows companies to take advantage of existing silicon manufacturing lines while adding new steps to form perovskite layer and specialty layers.<\/p>\n

      \nWhat challenges remain before mass production?<\/h2>\n

      Despite the importance of adopting T\u00dcV Rheinland, there are still several challenges before tandem units become a widespread product.<\/p>\n

      \n
        \n
      • Operating Life:<\/strong> Performance in fields and stations must be demonstrated for extended periods, not just in accelerated aging tests.<\/li>\n
      • Homogeneity:<\/strong> Maintain uniform thickness and composition of perovskite over large areas.<\/li>\n
      • Manufacturing Return:<\/strong> Reduce the number of defective cells during production.<\/li>\n
      • Packaging:<\/strong> Prevent moisture and oxygen from reaching sensitive layers.<\/li>\n
      • Cost:<\/strong> Ensure that additional manufacturing steps do not negate the economic benefit of higher efficiency.<\/li>\n
      • Materials and Sustainability:<\/strong> Improved end-of-life materials management and recycling.<\/li>\n<\/ul>\n<\/div>\n

        \nFrom Efficiency to Reliability<\/h2>\n

        Qcells\u2019 journey can be summed up in three main stages. It started with a tandem efficiency of 28.6% in December 2024, then went on to pass critical stress tests in May 2025, leading to the announcement of the T\u00dcV Rheinland certification in July 2026. This sequence reveals a significant change in the priorities of the perovskite industry. In the early stages the key question was: To what level can efficiency be raised? Today, the most important question remains: Can these cells be manufactured in a stable unit?<\/p>\n

        \nConclusion<\/h2>\n

        \nQcells\u2019 achievement is not just a new technical certification, but reflects the transition of tandem perovskite and silicon cells to a more mature stage, going beyond record-setting towards proving reliability and manufacturability.<\/p>\n

        But passing stress tests and obtaining independent accreditation is a crucial step in removing one of the biggest obstacles to perovskite technology. Competition in solar energy is not just about who achieves the highest efficiency, but about who can turn that efficiency into a reliable unit, capable of producing in the millions, and generating electricity for many years in various climatic conditions.<\/p>\n

        \n

        \nSources:<\/strong> Qcells, Hanwha, T\u00dcV Rheinland, PV Magazine, PV-Tech, Perovskite-Info, and PEPPERONI European Project.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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