Fullerene Derivatives for Stable Perovskite Solar Battery Interfaces
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Solution Overview
Problem
Current fullerene materials used in perovskite solar batteries face issues with poor performance and stability due to phase instability and interfacial defects, which affect photon-to-electron conversion efficiency.
Innovation Solution
A fullerene derivative with specific functional groups such as halogens and nitrogen-containing groups is introduced to stabilize the phase and passivate interfacial defects, improving electron transport and energy level matching with the perovskite layer, eliminating the need for additional passivation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current fullerene materials are used in perovskite solar batteries, then the manufacturing process remains simple and low-cost, but the performance and stability of the solar batteries are poor
Solution Approach 1:
The patent modifies the chemical structure of fullerene materials by introducing specific functional groups (halogens, nitrogen-containing groups, aryl groups) to change the energy levels and binding energies. This parameter change enables the fullerene derivative to simultaneously achieve phase stabilization, defect passivation, and electron transport without adding structural complexity to the device architecture.
Solution Approach 2:
The patent creates a composite fullerene derivative that combines multiple functional groups (electron-withdrawing halogens and electron-donating nitrogen-containing groups) within a single molecular structure. This composite approach allows the material to perform multiple functions (phase stabilization, defect passivation, energy level matching) simultaneously, improving reliability without increasing device complexity.
2Reliability
If current fullerene materials are used in perovskite solar batteries, then the production cost remains low, but the photon-to-electron conversion efficiency is poor
Solution Approach 1:
The patent optimizes the energy level parameters (HOMO and LUMO levels) of the fullerene material by introducing specific functional groups. The electron-withdrawing halogens and electron-donating nitrogen-containing groups adjust the energy levels to better match the perovskite layer, improving charge separation and photon-to-electron conversion efficiency while maintaining compatibility with existing low-cost manufacturing processes.
Solution Approach 2:
The patent uses a single fullerene derivative molecule that performs multiple functions (electron transport, phase stabilization, defect passivation) simultaneously, eliminating the need for separate passivation layers. This multi-functional approach reduces the number of manufacturing steps and materials required, maintaining low production cost while improving efficiency.
3Stability of the object's composition
If additional passivation layers are added to improve interface stability, then the phase stability and defect passivation are improved, but the device complexity and production cost increase
Solution Approach 1:
The patent designs a universal fullerene derivative that simultaneously performs electron transport, phase stabilization, and defect passivation functions. The functional groups in the molecule provide binding sites for stabilizing the perovskite phase and passivating interfacial defects, while the C60 core maintains electron transport capability. This multi-functionality eliminates the need for separate passivation layers, maintaining simple device structure.
Solution Approach 2:
The patent merges the functions of the electron transport layer and the passivation layer into a single fullerene derivative material. The electron-withdrawing and electron-donating functional groups work together within the same molecule to provide both electron transport and interface passivation, simplifying the device structure while improving phase stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The fullerene derivative enhances the photon-to-electron conversion efficiency and stability of perovskite solar batteries by increasing binding energy and reducing non-radiative recombination, while also reducing production costs by omitting the passivation layer.
Implementation Method 1
these introduced functional groups can increase the binding energy to the proton at position A in perovskite (chemical formula: ABX3) and can be better anchored with lead
Implementation Method 2
they can reduce the non-radiative recombination, so that the interfacial defects of the perovskite can be passivated
Implementation Method 3
Fullerene materials are often used as electron transport layers in perovskite solar batteries due to their properties such as high electron mobility
Implementation Method 4
perovskite solar batteries are favored due to their advantages such as high photon-to-electron conversion efficiency
Data Source
AI summary
A fullerene derivative having a C60 fullerene group and a group of a compound of formula (1), a compound of formula (2), and/or a compound of formula (3) attached thereto, where the structural formulas of the compounds of formula (1), formula (2), and formula (3) are as follows:where R1, R2, R3, R4, R5, R6, R7, R8, R9, n1, n2, n3, m1, m2, and m3 are as defined in the specification.