Perovskite Crystal Lattice Surface Cations for Durable Solar Cells
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Solution Overview
Problem
Existing perovskite materials for photovoltaic devices are prone to degradation due to environmental factors such as temperature, humidity, and oxidation, leading to reduced durability and efficiency.
Innovation Solution
The development of enhanced perovskite materials with a perovskite crystal lattice formula of CxMyXz, where bulky organic cations reside near the surface or grain boundary, and are not chemically connected to the surface, improving durability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If perovskite materials are used as photoactive layers in photovoltaic devices, then power generation efficiency from solar energy is improved, but durability is worsened due to degradation from environmental factors such as temperature, humidity, and oxidation
Solution Approach 1:
The patent introduces bulky organic cations at specific locations (surfaces and grain boundaries) of the perovskite crystal lattice, creating local structural modifications that provide environmental protection without altering the bulk photoactive properties. This localized approach maintains high power generation efficiency while improving durability against temperature, humidity, and oxidation degradation
Solution Approach 2:
The patent creates a composite perovskite material system by incorporating bulky organic cations (such as formamidinium, guanidinium, or ethene tetramine) into the perovskite crystal lattice (CxMyXz). This composite structure combines the high efficiency of perovskite photoactive layers with the protective properties of bulky organic cations that resist environmental degradation
2Adaptability or versatility
If perovskite materials are exposed to environmental factors, then photovoltaic devices can operate in real-world conditions, but degradation occurs leading to reduced efficiency
Solution Approach 1:
The patent applies beforehand cushioning by pre-installing bulky organic cations at surfaces and grain boundaries of the perovskite crystal lattice before environmental exposure. These cations act as protective buffers that cushion against degradation from temperature, humidity, and oxidation, allowing the device to operate in real-world conditions while maintaining efficiency
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 enhanced perovskite materials demonstrate improved durability and efficiency by reducing degradation from environmental factors, leading to more stable and effective photovoltaic performance.
Implementation Method 1
Bulky organic cations reside near a surface or a grain boundary of the perovskite crystal lattice
Data Source
AI summary
A perovskite material that has a perovskite crystal lattice having a formula of CxMyXz, and alkyl polyammonium cations disposed within or at a surface of the perovskite crystal lattice; wherein x, y, and z, are real numbers; C comprises one or more cations selected from the group consisting of Group 1 metals, Group 2 metals, ammonium, formamidinium, guanidinium, and ethene tetramine; M comprises one or more metals each selected from the group consisting of Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr, and combinations thereof; and X comprises one or more anions each selected from the group consisting of halides, pseudohalides, chalcogenides, and combinations thereof.