Related Experiment Video
Updated: Jul 29, 2025
11:38
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
18.6K
Visualizing Interfacial Energy Offset and Defects in Efficient 2D/3D Heterojunction Perovskite Solar Cells and
Weichuang Yang1,2, Bin Ding3, Zedong Lin4
1Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences (CAS), Ningbo, 315201, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|May 25, 2023
Summary
Improving perovskite solar cells (PSCs) requires addressing charge carrier recombination. A novel 2D/3D heterojunction approach enhances passivation and efficiency, achieving over 25% power conversion efficiency and improved stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) show great promise but are limited by charge carrier recombination.
- Imperfect passivation methods hinder the full potential of PSCs.
- Understanding recombination loss mechanisms is crucial for efficiency gains.
Purpose of the Study:
- To quantify recombination loss mechanisms in PSCs.
- To investigate the role of interfacial energy offset and defects.
- To explore the potential of 2D perovskites and 2D/3D heterojunctions for high-efficiency and stable PSCs.
Main Methods:
- Quantification of recombination loss mechanisms.
- Analysis of interfacial energy offset and defect impacts.
- Fabrication and characterization of 2D/3D heterojunction PSCs.
Main Results:
- A favorable energy offset effectively suppresses interfacial recombination more than chemical passivation.
- 2D/3D heterojunction PSCs demonstrate enhanced passivation and charge carrier extraction.
- Power conversion efficiency reached 25.32% for small devices and 21.48% for large-area modules (29.0 cm²).
- Ion migration was suppressed, with devices retaining 90% efficiency after 2000 hours of operation.
Conclusions:
- 2D/3D heterojunctions offer a promising strategy for high-efficiency and stable PSCs.
- Modest chemical passivation is sufficient for 2D perovskites due to their field effects.
- The developed heterojunctions significantly improve PSC performance and operational stability.
Related Concept Videos
01:06Interfacial Electrochemical Methods: Overview
291
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
291
01:11P-N junction
590
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
590
01:01Energy Bands in Solids
957
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
957
01:27Schottky Barrier Diode
407
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
407
01:10Energy Diagrams - II
4.7K
Energy diagrams are important to understand the dynamics of a system. The topology of an energy diagram helps illustrate the equilibrium points of the system.
The point in the energy diagram at which the system’s potential energy is the lowest is known as the local minima. The system tends to stay in this position indefinitely unless acted upon by a net force. The slope of the potential energy diagram at the local minima is zero, indicating that zero net force is acting on the system. The...
The point in the energy diagram at which the system’s potential energy is the lowest is known as the local minima. The system tends to stay in this position indefinitely unless acted upon by a net force. The slope of the potential energy diagram at the local minima is zero, indicating that zero net force is acting on the system. The...
4.7K
02:58Cell Potential and Free Energy
41.0K
Thermodynamics of a Redox Reaction
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
Thus, a link can be predicted between cell potential, free energy change, and the equilibrium constant for the reaction. Cell potential can also be measured as the oxidant or the reducing strength, and similar acid-base strength measures are reflected in equilibrium...
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
Thus, a link can be predicted between cell potential, free energy change, and the equilibrium constant for the reaction. Cell potential can also be measured as the oxidant or the reducing strength, and similar acid-base strength measures are reflected in equilibrium...
41.0K