1. Introduction to
Perovskite Film
Perovskite films are a class of crystalline materials with a structure similar
to the mineral perovskite. These films have gained significant attention for
their potential applications in solar cells, LEDs, and other optoelectronic
devices due to their exceptional light-absorbing properties.
by Dilnaz Kadyrma
2. Importance of Molecular
Controlling in Perovskite Film
1 Controlled Properties 🌐
Molecular controlling is essential for tailoring the electronic and optical properties of
perovskite films, allowing precise tuning of bandgaps and charge transport
characteristics.
2 Enhanced Stability ⚛️
Controlling the molecular structure enables the improvement of the film's stability,
which is crucial for commercial applications and long-term performance.
3 Uniformity and Consistency 📏
Molecular control contributes to the uniformity and consistency of perovskite films,
ensuring reliable and reproducible device performance.
3. Common Methods for Molecular
Controlling in Perovskite Film
Surface
Modification
Modifying the surface of
perovskite films through
chemical treatments or
self-assembled
monolayers to control
grain size, morphology,
and enhance stability.
Interface
Engineering
Tailoring the interfaces
between the perovskite
active layer and charge
transport layers to
optimize charge extraction
and minimize
recombination.
Chemical Doping
Introducing dopant
molecules to the
perovskite structure to
fine-tune its optoelectronic
properties and enhance
overall device
performance.
4. Method 1: Surface Modification
Surface Cleanliness
Meticulous cleaning and treatment of the perovskite surface to remove
impurities and enhance the film's adhesion and stability.
Grain Size Control
Customizing the grain size and orientation of perovskite crystals on the
surface to optimize charge transport and reduce defects.
Functional Group Attachments
Attaching functional groups to the surface for passivation and to tailor the
interaction with neighboring layers.
5. Method 2: Interface Engineering
1
Electronic Band Alignment
Precisely aligning the energy levels at the
interface to facilitate efficient charge transfer
and reduce energy loss.
2
Interfacial Layer Optimization
Designing and optimizing interfacial layers to
minimize defects and enhance charge
extraction while maintaining stability.
6. Method 3: Chemical Doping
1. Dopant Selection Choosing the appropriate dopant species
to modulate the electronic structure and
stabilize the perovskite film.
2. Concentration Optimization Optimizing dopant concentration to
achieve the desired charge carrier
concentration and enhance film
performance.
7. Key Principles for Defect
Passivation in Perovskite Film
Defect Identification 🔍
Thorough characterization and
identification of defects within the
perovskite film to address specific
issues and devise appropriate
passivation strategies.
Defect Passivation
Techniques ⚙️
Implementing surface treatments,
interfacial engineering, and doping to
effectively passivate defects and
improve device performance.
8. Principle 1: Defect Identification
1 Advanced Characterization
Characterization techniques such as SEM, AFM, EDS-SEM, and
photoluminescence mapping are employed to pinpoint and analyze defects.
2 Defect Mapping
Mapping the distribution and nature of defects across the perovskite film to
understand their impact on device performance.
9. Principle 2: Defect Passivation
Techniques
Surface Treatments
Utilizing self-assembled
monolayers or chemical
treatments to passivate
surface defects and
enhance film stability.
Doping Strategies
Strategically incorporating
dopants to modify the
electronic properties and
reduce trap states, leading
to improved charge
transport.
Interfacial
Engineering
Engineering interfacial
layers to minimize charge
recombination and mitigate
the impact of defects on
device performance.
10. Conclusion and Key Takeaways
1 Technological
Advancements 🚀
The advancements in molecular
controlling and defect passivation
techniques are paving the way for
enhanced stability and efficiency of
perovskite-based devices.
2 Future Prospects 🔍
Exploring novel molecular controlling
strategies and defect engineering
concepts will open up new avenues
for the commercialization of
perovskite film technology.
