Amorphous Solar Panel: Features and Benefits

In the photovoltaic market, there are several panel technologies: monocrystalline, polycrystalline, and amorphous silicon. The choice among these solutions requires careful evaluation of factors such as efficiency, flexibility, and installation conditions.

An amorphous solar panel is a solar module made with non-crystalline silicon deposited in thin layers on a substrate, capable of producing electricity even in diffuse or suboptimal light conditions.

Due to this characteristic, amorphous modules represent an interesting alternative compared to traditional technologies: monocrystalline panels ensure maximum efficiency thanks to their single crystal structure, polycrystalline panels offer a good compromise between performance and cost, while those made of amorphous silicon stand out for their lightness and versatile applications, albeit with a lower yield per unit area.

In particular, amorphous silicon can be advantageous in contexts where solar radiation is diminished by unfavorable climatic conditions or design constraints. To avoid sizing errors that could compromise the performance of the system, it is useful to rely on photovoltaic software capable of accurately supporting the design and performance analysis.

Amorphous solar panel – Solarius-PV software

What are amorphous solar panels?

Amorphous solar panels are a type of photovoltaic technology that uses amorphous silicon as the main material for converting sunlight into electricity.

Unlike traditional crystalline panels, these modules stand out for their different material structure, which does not exhibit an ordered lattice but a more disorganized configuration.

From an aesthetic point of view, they are recognized for their uniform coloration, usually black or otherwise dark, and for certain characteristics that make them particularly interesting in design contexts: lightness, flexibility, and versatility of application.

Thin film panel

Efficiency of amorphous solar panels: explanation and function

The efficiency of amorphous photovoltaic panels is closely related to their structure and thin-film technology, which clearly distinguishes them from crystalline silicon modules.

Unlike the latter, amorphous silicon does not have a well-ordered crystalline structure. This characteristic affects the electronic properties of the material and, consequently, the ability to convert solar energy.

Thin-film cells are made by depositing an extremely thin layer of semiconductor material onto a substrate, usually glass, through processes such as vaporization, spraying, or electrochemical techniques. The thickness of the active material is very low, about 1–2 μm, compared to 200–250 μm for crystalline cells (for more details on the various types and configurations, read the in-depth article on photovoltaic cells).

This configuration results in some direct effects on performance:

• lower efficiency compared to monocrystalline and polycrystalline panels;
• better performance in diffuse light or low irradiation conditions;
• less sensitivity to high temperatures.

From a construction standpoint, an amorphous panel generally consists of a transparent glass sheet onto which a layer of amorphous silicon, appropriately treated to enhance conductivity, is deposited. The side exposed to the sun remains transparent, while the backside houses the electrical connections.

Another key aspect affecting overall efficiency is the reduced amount of material used: the low thickness allows for cheaper production, but it also results in lower energy yield per unit area.

However, thin-film technology offers significant advantages in terms of lightweight, flexibility, and architectural integration, making these panels particularly suitable in contexts where traditional modules are less efficient or difficult to install.

Comparison of efficiency between different photovoltaic technologies

Amorphous solar panels: materials used

The main materials used for the production of thin-film panels are:

• amorphous silicon: in which the atoms are not arranged in a regular crystal lattice, but in a disorganized structure. This distinguishes it from crystalline silicon, which has an organized atomic structure. The term amorphous comes from Greek and literally means shape-less;
• cadmium telluride (CdTe): is a low-cost thin-film technology that uses cadmium, a material classified as toxic. Cadmium is generally subject to restrictions in electrical and electronic equipment according to European regulations; however, photovoltaic modules represent a specific case for which exemptions are provided, allowing its use under controlled conditions;
• microcrystalline cadmium sulfide (CdS): has very low production costs because the technology used for its production does not require the extremely high temperatures necessary for the melting and purification of silicon. It is applied to a metal substrate using spray-coating, meaning it is sprayed like paint. Among the disadvantages related to the production of this type of photovoltaic cells are the toxicity of cadmium and the low efficiency of the device;
• gallium arsenide (GaAs), an alloy capable of ensuring extremely high efficiencies, due to the property of having a direct bandgap, unlike silicon. It is primarily used for military or advanced scientific applications, such as automated planetary exploration missions or particularly sensitive photodetectors;
• copper indium selenide (CIS): with opacity varying from 100% to 70% obtained through holes made directly in the film;
• copper indium gallium selenide (CIGS): is the most promising photovoltaic technology made up of copper, indium, gallium, and selenium. These four materials make the potential performance of CIGS much higher than that of any other thin film. In fact, CIGS, with the same amount of light, produces more electricity than other thin films and therefore has a high conversion efficiency, extremely stable over time, meaning that performance remains unchanged for many years.

Difference between amorphous and crystalline photovoltaic panels

The main variation between amorphous, monocrystalline, and polycrystalline photovoltaic panels lies in their efficiency, that is, the ratio between the energy produced and the area occupied by the panels.

In particular, the most efficient photovoltaic panels are those that require less space to generate the same amount of energy, given equal solar irradiation, temperature, and other external conditions that affect the functioning of the system.

Thus:

• monocrystalline panels stand out for their superior efficiency, with a percentage ranging from 15 to 20%, requiring approximately 6 m² to produce 1 kW of power;
• polycrystalline photovoltaic panels show lower efficiency and require a larger area: approximately 8 m² to produce 1 kW of power;
• amorphous photovoltaic panels have a production efficiency of about 6% and need an area of 11÷13 m² to produce 1 kW of power.

Considering efficiency under different temperature conditions:

• monocrystalline panels are more efficient at low temperatures and surpass polycrystalline modules in efficiency when solar intensity is reduced;
• polycrystalline panels, on the contrary, produce more at high temperatures as they are better able to tolerate heat;
• amorphous photovoltaic panels have lower efficiencies but have the advantage of performing better under high temperatures or diffuse light conditions.

Another significant distinction concerns the cost of the panels:

• monocrystalline panels are generally more expensive;
• polycrystalline panels are more affordable;
• thin-film panels are the cheapest available on the market.

Another distinction relates to the structure:

• monocrystalline panels are black and have an orderly structure; polycrystalline panels are variegated blue and show a more disorganized structure;
• amorphous photovoltaic panels have an absent structure concerning the cells that make them up but, compared to more traditional technologies, have great versatility of use.

Comparison of different types of solar panels

Advantages and Disadvantages of Amorphous Solar Panels

Amorphous photovoltaic panels offer some distinctive advantages over traditional technologies, particularly in terms of cost and flexibility of use.

Among the main strengths of thin-film technology are:

• low production cost, thanks to the reduced use of semiconductor material;
• good performance at high temperatures, the decrease in efficiency is lower compared to crystalline panels;
• greater real efficiency in warm climates, with a production that can be 5–10% higher per installed watt;
• less sensitivity to shading, with more contained losses in the presence of shaded areas;
• better adaptability to surfaces, even with non-optimal inclinations;
• good performance with diffuse light or cloudy skies;
• lightness and flexibility, ideal for integrated architectural applications;
• simpler manufacturing processes and less material usage;
• use of generally non-toxic and eco-friendly substances.

One particular aspect to consider is the so-called initial degradation: amorphous panels experience a reduction in performance immediately after production, which then stabilizes over time.

Alongside the advantages, there are also some limitations:

• lower energy yield compared to monocrystalline and polycrystalline panels;
• requirement for larger surfaces to achieve the same energy output;
• less market penetration, with more limited availability compared to crystalline technologies.

Best Applications of Amorphous Solar Panels

Thanks to their lightness, flexibility, and good performance in non-optimal light conditions, amorphous photovoltaic panels find application in contexts where traditional modules are less effective or difficult to install.

They are particularly suitable for:

• architectural integration (BIPV), for example on facades, lightweight roofs, or unconventional surfaces;
• roofs with limited loads, where the reduced weight is a design advantage;
• curved or irregular surfaces, thanks to the possibility of using flexible modules;
• systems in areas with diffuse or variable light, such as dense urban areas or often cloudy climates;
• mobile or temporary applications, such as RVs, boats, or temporary structures;
• low-power devices, such as autonomous lighting, sensors, or off-grid systems.

In general, amorphous panels are an effective choice when the goal is not to maximize output per square meter, but to ensure continuity of production and design adaptability.

Main applications of amorphous photovoltaic panels

How long do amorphous solar panels last?

The lifespan of amorphous photovoltaic panels is generally shorter compared to that of crystalline silicon modules, but still adequate for many applications.

On average, the useful life is between 10 and 20 years, depending on the quality of the product and the installation conditions.

A characteristic aspect of this technology is the so-called initial degradation (Staebler-Wronski effect): immediately after commissioning, the panels experience a reduction in performance, which then stabilizes over time.

After this initial phase, the efficiency decay proceeds more slowly and steadily. However, compared to monocrystalline and polycrystalline panels, the overall loss of yield in the long term is generally more pronounced.

For this reason, it is important to consider in the design:

• the expected lifespan of the system;
• the context of use;
• the ratio between initial cost and performance over time.

Choosing amorphous photovoltaic panels: design criteria

The decision to use amorphous photovoltaic panels depends closely on the specific needs of the project.

This technology represents a beneficial solution when:

• the available space is ample but not perfectly oriented;
• there are structural or weight constraints;
• high architectural integration is required;
• the irradiation conditions are not optimal (diffused light, shading)

Conversely, if the main goal is to achieve maximum energy efficiency in limited spaces, crystalline silicon panels generally remain the most effective choice.

In the design phase, it is therefore essential to carefully evaluate the context, considering not only nominal efficiency but also factors such as environmental conditions, available surfaces, and architectural requirements.

When to choose amorphous or crystalline panels?

If you are considering using solar panels, amorphous or crystalline, it is essential to rely on reliable tools for the analysis and design of the system.

With specific and professional software, you can design photovoltaic systems comprehensively, from evaluating production capacity to economic and regulatory verification, optimizing every choice based on the real context. Discover all the features of the software for the design and simulation of photovoltaic systems and make your workflow more efficient, fast, and reliable.

FAQ about amorphous solar panels

What does amorphous photovoltaic panel mean?

An amorphous photovoltaic panel is a thin-film module made from non-crystalline silicon, deposited on a substrate like glass. This structure allows for electricity generation even in diffuse or suboptimal lighting conditions.

What is amorphous silicon?

Amorphous silicon is a material in which the atoms are not arranged in an orderly crystalline lattice, but in a disorganized manner. This structure distinguishes it from crystalline silicon and affects its electronic properties and photovoltaic performance.

How efficient is an amorphous photovoltaic panel?

Amorphous panels have a lower efficiency compared to crystalline ones, generally around 6%. However, they can offer more stable performance in high-temperature or low-irradiation conditions.

What are the main advantages of amorphous panels?

Among the main advantages are:

• lower production cost;
• good output with diffuse light;
• lower sensitivity to high temperatures;
• lightweight and flexibility;
• greater adaptability to unconventional surfaces.

What are the disadvantages of amorphous photovoltaic panels?

The main limitations concern:

• lower energy yield;
• need for more surface area to produce the same energy;
• less widespread compared to crystalline panels.

When is it advisable to use amorphous photovoltaic panels?

They are recommended when:

• the space is ample but not perfectly oriented;
• there are weight or structural constraints;
• architectural integration is needed;
• light conditions are variable or suboptimal.

How long do amorphous solar panels last?

The average lifespan ranges from 10 to 20 years. After an initial drop in performance, typical of this technology, the yield tends to stabilize over time.

Do amorphous panels work well in low light?

Yes, thanks to their thin-film technology, they perform better than traditional panels under diffuse light or cloudy skies.

What is the difference between amorphous and crystalline panels?

The main difference concerns structure and efficiency:

• crystalline panels are more efficient but less flexible;
• amorphous panels have lower output but greater adaptability and better performance in non-ideal conditions.