The new face of photovoltaics: technologies, modules and the transformation of solar
In the contemporary energy landscape, photovoltaics is no longer a technology ‘of the future’ but has become a tangible component of the present. The combination of climate urgency, security of supply and progressive cost reduction has transformed solar energy into one of the most widespread and accessible solutions for generating electricity, both on a domestic scale and in large industrial plants. This is not just quantitative growth: photovoltaics has also undergone profound changes in the quality of its technical solutions, in the sophistication of its production processes and in its ability to integrate into modern energy systems.
In 2025, photovoltaics consolidated its role in the global energy system, with solar generation increasing by approximately 600 TWh compared to 2024: the largest annual increase ever recorded for a single energy source. Even more significant is the fact that photovoltaics alone contributed over 25% of the growth in global energy demand, making it the main source of new generation. These data clearly illustrate the transition of solar from a complementary source to a strategic energy infrastructure.
What is commonly identified as a ‘solar panel’ is in fact an complex system, concealing significant technological sophistication. More specifically, a photovoltaic module is a system that contains and connects multiple photovoltaic cells. The cells are the elementary devices that convert light into electric current; the module is the structure that protects them, connects them and enables their use under real-world conditions. There are various types of cells – from monocrystalline silicon and polycrystalline silicon to more advanced architectures – as well as different ways of integrating them into the modules. The final performance depends not only on the quality of the individual cell, but also on how the cells are integrated into the module, the type of encapsulation, the geometry of the connections, the management of electrical and thermal losses, and the ability to make the best use of available light.
An overview of industrial property clearly shows how competitive and intensely innovative the solar sector has become. In the last twenty years, within the sole scope of one of the most widespread cell technologies – heterojunction (HJT) cells – and the related modules, patent families grew by approximately 168% between the 2004–2013 and 2014–2023 periods, with a particularly evident acceleration after 2020. The geographical distribution of this innovation leans heavily towards Asia, which represents over 80% of patent families. However, Europe continues to maintain a prominent role in the most advanced fields of research, with positive growth and a significant foothold in high-technology segments. In the European context, innovative efforts are concentrated above all on critical processes such as the deposition of transparent conductive oxides (Transparent Conductive Oxides, TCO), electrode deposition, stabilization treatments such as light soaking, and some interconnection and module layout solutions; it is no coincidence that players such as CEA, Fraunhofer, TU Delft, Meyer Burger, 3SUN and other industrial and academic entities feature prominently in the most recent innovation activities.
Since the 2000s, the first major phase of modern photovoltaics has been the mass diffusion of conventional crystalline silicon. For a long time, the market was dominated by polycrystalline and monocrystalline silicon cells, with polycrystalline being favored for its lower costs and a consolidated supply chain. Over time, however, the industry has shifted towards monocrystalline, more efficient and better suited to advanced architectures. Today, crystalline silicon photovoltaics covers almost the entire global market, while polycrystalline has taken on a marginal role. This transition reflects an industrial maturation in which efficiency, energy yield and compatibility with more advanced processes matter more than the initial cost alone.
A second crucial phase concerned the optimization of cell architectures, with BSF (Back Surface Field) and especially PERC (Passivated Emitter and Rear Contact) playing central roles. For years, PERC cells were the reference solution because they increased efficiency without requiring a clean break from existing production lines. In photovoltaics, in fact, the winner is often not the most sophisticated technology, but the one that best balances performance, industrial compatibility and the cost of the energy produced. However, nowadays PERC technology is giving way to n-type architectures, in particular TOPCon (Tunnel Oxide Passivated Contact), which offers better performance, good degradation control and rapid industrial scalability. For this reason, it is now considered one of the most balanced solutions between efficiency, cost and industrialization.
Higher up the performance scale, on the other hand, are HJT cells (HeteroJunction Technology) and IBC cells (Interdigitated Back Contact). HJT cells combine crystalline silicon and thin amorphous layers, offering excellent efficiencies, good thermal behavior and very interesting yields, especially in bifacial configurations. IBC cells, meanwhile, move the contacts to the rear of the cell, reducing front shading and increasing the useful efficiency, with the added aesthetic advantage that makes them particularly appreciated in the high-end residential context. In general terms, HJT and IBC are today among the most efficient solutions in the commercial silicon landscape, but also those that require higher industrial costs.
A major innovative frontier is represented by so-called ‘tandem’ cells, in particular cells that combine perovskite and silicon and promise to overcome the theoretical limits of single-junction silicon. European players are trying to bring this promise to an industrial level, showing that Europe, despite facing competitive pressure on volumes, can still carve out an important space in very high-efficiency technologies and new-generation platforms.
However, the above tells only half the story, because modern photovoltaics is not just a matter of the cell, but increasingly of the module. In the past, the module was typically considered a simple protective container; today it has clearly become an active component in the overall performance of the system. The methods of interconnection between the cells, the distribution of the strings, the use of ribbons, conductive adhesives, wires or special layouts, the choice of encapsulation materials, the mechanical rigidity, the ability to manage thermal expansion and even the geometry of the areas without active cells substantially influence the yield of the final product. In this sense, module innovation has progressively converged with cell innovation, to the point of becoming almost inseparable from it.
The spread of bifacial modules is a very clear example of this transformation. The possibility of producing energy also from the rear side (i.e., the side not directly facing sunlight) of the module has made these devices particularly interesting in large ground-mounted systems, where the reflected radiation from the ground and the optimization of the layout can translate into a real increase in production. Industrial roadmaps indicate very high market shares for bifacial cells, with European operators who have built part of their position precisely on the valorization of high-bifaciality architectures. What matters, in these cases, is not only the nominal efficiency of the cell, but the ability of the module to exploit the installation context and to transform into useful energy light that would otherwise be lost.
It is not surprising, then, that a significant part of the most recent inventive effort is focused precisely on segments that lie between the cell and the module. On the cell side, the most addressed areas are the deposition of TCOs, the electrode deposition on the TCOs and the light soaking. On the module side, the focus shifts to interconnection with ribbons and electrically active conductive adhesives, as well as on layouts referred to as butterfly, i.e., symmetrical configurations designed to optimize electrical behavior, shading tolerance and string arrangement. This is also interesting from an industrial perspective: it demonstrates that innovation concerns not only the semiconductor material, but the entire path that leads from the wafer to the finished module.
When moving from the technological to the application level, the picture becomes even clearer. In the residential and small commercial sectors, the available surface area, aesthetics, temperature performance, durability and economic return on relatively compact systems are very important. Here, high-efficiency technologies, such as HJT, IBC and more generally premium n-type modules, find their natural place. In large industrial and utility-scale installations, however, the logic is often different: the key parameter becomes the levelized cost of energy, i.e., the overall ratio between system cost, energy produced and lifetime. For this reason, solutions that offer the best balance between performance, reliability and scalability have been enormously successful at utility-scale: bifacial modules, large formats, TOPCon architectures and systems integrated with storage. Moreover, economic analyses show that utility-scale photovoltaics is now among the most competitive forms of new electricity generation and that pairing with storage systems further strengthens this competitiveness.
It is precisely here that photovoltaics encounters one of its most significant transformations: from a distributed and almost ‘domestic’ technology to a structural component of the grid. On the one hand, solar is increasingly a choice for families, condominiums, businesses and energy communities, driven by self-consumption, storage systems and a growing focus on energy resilience. On the other hand, large solar farms are becoming strategic assets capable of contributing significantly to the stability of the electricity system, especially when paired with batteries, flexibility management systems and smarter grids. The growth in the share of solar naturally requires investments in the grid, storage and flow control, but for this very reason, photovoltaics is shifting from an intermittent source ‘to be integrated’ to the veritable backbone of the decarbonized energy system.
In conclusion, photovoltaics in 2026 is much more than a collection of panels on the roofs of our homes or solar fields in the countryside. It is an advanced industrial platform, where materials, processes, optics, mechanics and electronics converge ever more closely. The least expensive technologies do not always coincide with the most efficient ones; at the same time, the most efficient technologies are not necessarily the most suitable for every application. The true competitive advantage is increasingly built on the ability to integrate cell and module innovation, and the capacity to incorporate it all into a more flexible, digital and decarbonized energy system. It is in this integration, rather than in a single laboratory record, that the future of solar will be played out.
