Perovskite Precursor Additive for Thin-Film Defect Suppression
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Solution Overview
Problem
The commercial large-scale application of perovskite solar cells is limited due to the challenge of prolonging their service life, primarily due to degradation caused by factors such as susceptibility to oxygen, moisture, and light.
Innovation Solution
A perovskite precursor solution is developed containing a hydrogen halide salt with a weakly reducing group that is inert to the divalent cation in the perovskite-type metal halide, which acts as a sacrificial agent, suppressing defects and enhancing the stability of the perovskite cells by inhibiting the formation of B0, thereby prolonging the service life of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perovskite solar cells are manufactured using conventional precursor solutions, then photoelectric conversion efficiency can be achieved, but service life is limited due to degradation from oxygen, moisture, and light susceptibility
Solution Approach 1:
The patent introduces an additive as an intermediary substance in the perovskite precursor solution that reacts with and neutralizes harmful factors (oxygen, moisture, light-induced degradation products). This additive acts as a protective mediator between the perovskite structure and environmental degradation factors, thereby extending service life without compromising photoelectric conversion efficiency
Solution Approach 2:
The patent employs a sacrificial agent in the precursor solution that is intentionally designed to be consumed during the formation process. This short-living component reacts preferentially with harmful substances during manufacturing, protecting the main perovskite structure from degradation and effectively sacrificing itself to prolong device lifetime
2Reliability
If additives are added to improve stability and prolong service life, then reliability increases, but device complexity increases
Solution Approach 1:
The patent modifies the chemical parameters of the precursor solution by incorporating specific additives with controlled concentrations and properties. These parameter changes enable the solution to self-regulate during processing, improving reliability while maintaining relatively simple manufacturing procedures without requiring complex multi-component systems
Data Source
AI summary
Provided is a perovskite precursor solution, a perovskite thin film, a perovskite cell, and an electrical device. The perovskite precursor solution comprises a perovskite precursor material, a solvent, and an additive; the additive contains, in its structure, a weakly reducing group which has reducibility on a 0 valence corresponding to a monovalent anion in the perovskite-type metal halide in the solution and is inert to a divalent cation in the perovskite-type metal halide; and the additive is a hydrogen halide salt.