Perovskite solar cells (PSCs) use a combination of semiconductor materials, charge-transport materials, additives, solvents, and electrodes to convert sunlight into electricity. The most important perovskite solar cell materials include perovskite precursor materials such as formamidinium iodide (FAI, CAS 879-48-1), methylammonium iodide (MAI, CAS 14965-49-2), and lead iodide (PbI₂, CAS 10101-63-0), as well as hole transport materials (HTMs), electron transport materials (ETMs), processing solvents, and functional additives.
A typical perovskite solar cell can be divided into several functional layers:
| Layer | Typical Materials | Primary Function |
|---|---|---|
| Absorber | FAI (CAS 879-48-1), MAI (CAS 14965-49-2), PbI₂ (CAS 10101-63-0) | Absorbs sunlight and generates charge carriers |
| HTL | Spiro-OMeTAD (CAS 207739-72-8), PTAA (CAS 1333317-99-9) | Transports holes |
| ETL | SnO₂ (CAS 18282-10-5), TiO₂ (CAS 13463-67-7) | Transports electrons |
| Additives | MACl (CAS 593-51-1), KI (CAS 7681-11-0) | Control crystallization and passivate defects |
| Solvents | DMF (CAS 68-12-2), DMSO (CAS 67-68-5) | Dissolve and process precursor materials |
Understanding the role of each material is essential when designing, optimizing, and scaling perovskite photovoltaic devices.
The main materials used in perovskite solar cells can be grouped into five categories:
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Perovskite precursor materials
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Hole transport materials (HTMs)
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Electron transport materials (ETMs)
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Perovskite additives
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Processing solvents
These materials work together to form the absorber layer, transport photogenerated charge carriers, control perovskite crystallization, and enable reproducible thin-film fabrication.
1. Perovskite Precursor Materials
Perovskite precursor materials are the chemical building blocks used to form the light-absorbing perovskite layer.
Most metal-halide perovskites used in photovoltaic research can be described by the general formula ABX₃, where:
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A is an organic or inorganic cation
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B is typically a metal such as lead or tin
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X is a halide such as iodide or bromide
The combination and ratio of these components determine the properties of the resulting perovskite material.
Formamidinium Iodide (FAI, CAS 879-48-1)
Formamidinium iodide (FAI, CAS 879-48-1) is an important precursor for formamidinium-based perovskites, including FAPbI₃.
FA-based perovskites are widely studied for high-performance photovoltaic applications because their composition can provide favorable optoelectronic properties.
FAI can also be combined with other cation and halide precursors to develop mixed-cation and mixed-halide perovskites.
Methylammonium Iodide (MAI, CAS 14965-49-2)
Methylammonium iodide (MAI, CAS 14965-49-2) is another widely used organic cation precursor.
MAI is commonly used with lead iodide to prepare methylammonium lead iodide:
MAI + PbI₂ → MAPbI₃
MAPbI₃ is one of the most extensively studied model perovskite compositions and remains important for investigating perovskite crystallization, film formation, and device performance.
Lead Iodide (PbI₂, CAS 10101-63-0)
Lead iodide (PbI₂, CAS 10101-63-0) is a key metal-halide precursor for lead-based perovskites.
It can be combined with FAI, MAI, and other organic or inorganic cation precursors to prepare different perovskite compositions.
The purity and quality of PbI₂ can be particularly important because precursor impurities may affect:
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Perovskite crystallization
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Film morphology
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Defect formation
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Charge transport
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Device reproducibility
Methylammonium Bromide (MABr, CAS 6876-37-5)
Methylammonium bromide (MABr, CAS 6876-37-5) provides bromide for mixed-halide perovskite formulations.
Replacing part of iodide with bromide can modify the bandgap of the perovskite absorber.
Mixed-halide systems are particularly relevant to research into:
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Bandgap engineering
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Wide-bandgap perovskites
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Perovskite/silicon tandem solar cells
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Multijunction photovoltaic devices
2. Hole Transport Materials (HTMs)
After the perovskite absorber generates electron-hole pairs, the holes must be efficiently extracted and transported toward the electrode.
This is the role of the hole transport layer (HTL).
Common HTMs investigated in perovskite solar cells include:
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Spiro-OMeTAD (CAS 207739-72-8)
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PTAA (CAS 1333317-99-9)
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Poly-TPD (CAS 146601-00-3)
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NiOₓ (CAS 1313-99-1)
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Other organic and inorganic hole transport materials
Spiro-OMeTAD (CAS 207739-72-8)
Spiro-OMeTAD (CAS 207739-72-8) is one of the most widely used organic hole transport materials in conventional perovskite solar cell architectures.
It is commonly investigated because of its suitable electronic properties and compatibility with solution-based processing.
The performance of Spiro-OMeTAD-based HTLs can also depend on the use of dopants and additives that modify their conductivity.
PTAA (CAS 1333317-99-9)
PTAA (poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine], CAS 1333317-99-9) is a polymeric hole transport material frequently investigated in high-performance perovskite devices.
PTAA is particularly relevant to inverted or p-i-n perovskite solar cell architectures.
The selection between Spiro-OMeTAD, PTAA, NiOₓ, and other HTMs depends on:
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Device architecture
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Energy-level alignment
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Deposition method
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Interface properties
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Stability requirements
3. Electron Transport Materials (ETMs)
The electron transport layer (ETL) extracts electrons from the perovskite absorber and transports them toward the electron-collecting electrode.
Common ETMs include:
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Tin oxide (SnO₂, CAS 18282-10-5)
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Titanium dioxide (TiO₂, CAS 13463-67-7)
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C₆₀ (CAS 99685-96-8)
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PCBM (CAS 160848-22-6) and related fullerene derivatives
Tin Oxide (SnO₂, CAS 18282-10-5)
SnO₂ (CAS 18282-10-5) is widely studied as an electron transport material for perovskite solar cells.
SnO₂ can be used in nanoparticle or colloidal formulations to form electron-selective layers.
It is particularly attractive for research involving low-temperature processing and scalable perovskite device fabrication.
Titanium Dioxide (TiO₂, CAS 13463-67-7)
TiO₂ (CAS 13463-67-7) is a historically important electron transport material in conventional n-i-p perovskite solar cells.
It can provide electron-selective transport while helping reduce undesirable charge recombination at the perovskite/electron transport interface.
TiO₂-based ETLs remain widely used in laboratory research, although SnO₂ has become an important alternative in many modern device architectures.
4. Perovskite Additives
Perovskite additives are incorporated into precursor formulations to modify crystallization and improve the properties of the resulting thin film.
Two commonly investigated additives include methylammonium chloride (MACl, CAS 593-51-1) and potassium iodide (KI, CAS 7681-11-0).
Methylammonium Chloride (MACl, CAS 593-51-1)
MACl (CAS 593-51-1) has been widely investigated as an additive in perovskite precursor formulations.
It can influence:
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Nucleation
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Crystal growth
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Grain morphology
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Film formation
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Perovskite phase formation
MACl is particularly common in research on high-quality perovskite films and FAPbI₃-based systems.
Potassium Iodide (KI, CAS 7681-11-0)
KI (CAS 7681-11-0) is another additive investigated for perovskite film engineering.
Potassium-containing additives can influence perovskite crystallization and defect chemistry and may help improve film quality and device performance.
The effectiveness of an additive depends on its concentration, precursor composition, processing conditions, and target device architecture.
5. Solvents for Perovskite Precursor Solutions
Solvents are essential for dissolving precursor chemicals and preparing formulations suitable for thin-film deposition.
Two of the most commonly investigated solvents are:
Dimethylformamide (DMF, CAS 68-12-2)
DMF (CAS 68-12-2) is widely used as a solvent for dissolving perovskite precursor materials.
Its high solvating ability makes it useful for preparing precursor solutions containing metal halides and organic cation salts.
Dimethyl Sulfoxide (DMSO, CAS 67-68-5)
DMSO (CAS 67-68-5) is frequently used either independently or together with DMF.
DMSO can interact with precursor components and intermediate species, influencing perovskite nucleation and crystallization.
Why Does Solvent Selection Matter?
Solvent selection can influence:
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Precursor solubility
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Solution stability
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Intermediate-phase formation
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Nucleation
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Crystal growth
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Film uniformity
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Deposition process compatibility
For this reason, solvent engineering is an important part of perovskite solar cell material optimization.
How Do These Materials Work Together?
The different material categories are not independent. Their interactions determine the final properties of the perovskite device.
A simplified conventional perovskite solar cell can be represented as:
Transparent Electrode → ETL → Perovskite Absorber → HTL → Metal Electrode
For example:
FTO → SnO₂ (CAS 18282-10-5) → FAI (CAS 879-48-1)/MAI (CAS 14965-49-2)/PbI₂ (CAS 10101-63-0)-based Perovskite → Spiro-OMeTAD (CAS 207739-72-8) → Au
During fabrication:
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Perovskite precursor materials are dissolved in a suitable solvent system.
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Additives can be introduced to control nucleation and crystallization.
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The precursor solution is deposited onto the substrate.
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The perovskite absorber forms during the drying and annealing process.
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The HTM and ETM facilitate selective charge extraction.
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Electrodes collect the generated electrical current.
Therefore, optimizing a perovskite solar cell is not simply a matter of selecting one high-performance material. Researchers need to consider the compatibility of the entire material system.
Perovskite Solar Cell Materials by Function
| Material Category | Examples | Main Role |
|---|---|---|
| Organic cation precursors | FAI (CAS 879-48-1), MAI (CAS 14965-49-2) | Provide A-site cations |
| Metal halide precursors | PbI₂ (CAS 10101-63-0) | Provide metal and halide components |
| Halide precursors | MABr (CAS 6876-37-5) | Tune halide composition and bandgap |
| Hole transport materials | Spiro-OMeTAD (CAS 207739-72-8), PTAA (CAS 1333317-99-9) | Hole extraction and transport |
| Electron transport materials | SnO₂ (CAS 18282-10-5), TiO₂ (CAS 13463-67-7) | Electron extraction and transport |
| Additives | MACl (CAS 593-51-1), KI (CAS 7681-11-0) | Crystallization and defect control |
| Solvents | DMF (CAS 68-12-2), DMSO (CAS 67-68-5) | Precursor dissolution and processing |
How to Choose Perovskite Solar Cell Materials
Material selection should be matched to the research objective and device architecture.
For Perovskite Composition Research：Focus on precursor purity, stoichiometric control, cation selection, and halide composition.
For Film Quality Optimization：Evaluate precursor concentration, solvent systems, additives, deposition conditions, and annealing conditions.
For Charge Transport Optimization：Compare different ETMs and HTMs based on energy-level alignment, conductivity, interface properties, and deposition compatibility.
For Tandem Solar Cells：Wide-bandgap perovskite compositions and compatible transport/interface materials become particularly important.
For Scale-Up：Researchers should additionally consider:
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Batch-to-batch consistency
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Raw material availability
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Solution stability
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Deposition compatibility
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Reproducibility
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Packaging and quantity requirements
Key Perovskite Solar Cell Materials to Consider
For researchers starting a perovskite solar cell materials program, the following materials represent important starting points for formulation and device development:
Perovskite Precursors
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Formamidinium iodide (FAI, CAS 879-48-1)
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Methylammonium iodide (MAI, CAS 14965-49-2)
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Lead iodide (PbI₂, CAS 10101-63-0)
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Methylammonium bromide (MABr, CAS 6876-37-5)
Hole Transport Materials
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Spiro-OMeTAD (CAS 207739-72-8)
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PTAA (CAS 1333317-99-9)
Electron Transport Materials
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Tin oxide (SnO₂, CAS 18282-10-5) nanoparticles
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Titanium dioxide (TiO₂, CAS 13463-67-7)
Additives
Solvents
These materials can serve as a starting point for studying perovskite composition, film formation, charge transport, and device optimization.
Frequently Asked Questions
What materials are used in perovskite solar cells?
The main materials include perovskite precursor materials, hole transport materials, electron transport materials, additives, solvents, electrodes, and interface-engineering materials.
What are the main perovskite precursor materials?
Common precursor materials include FAI (CAS 879-48-1), MAI (CAS 14965-49-2), PbI₂ (CAS 10101-63-0), and MABr (CAS 6876-37-5). Different precursor combinations are used to prepare different perovskite compositions.
What is used as the hole transport material in perovskite solar cells?
Common HTMs include Spiro-OMeTAD (CAS 207739-72-8) and PTAA (CAS 1333317-99-9), along with inorganic and self-assembled monolayer-based materials.
What is used as the electron transport material?
Common ETMs include SnO₂ (CAS 18282-10-5) and TiO₂ (CAS 13463-67-7). Fullerene-based materials such as C₆₀ (CAS 99685-96-8) and PCBM (CAS 160848-22-6) are also widely investigated, particularly in inverted device architectures.
Why are additives used in perovskite solar cells?
Additives such as MACl (CAS 593-51-1) and KI (CAS 7681-11-0) can be used to modify crystallization, film morphology, defect chemistry, and interface properties.
Why are DMF and DMSO used in perovskite solar cells?
DMF (CAS 68-12-2) and DMSO (CAS 67-68-5) are commonly used to dissolve perovskite precursor materials and control precursor-solution and crystallization behavior during thin-film fabrication.
Which materials are most important for perovskite solar cell research?
There is no single material that determines device performance. A typical research system requires a compatible combination of precursors, solvents, additives, ETMs, HTMs, and electrode/interface materials.
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