Perovskite Solar Cell Passivation Against Halide Ion Elution
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Solution Overview
Problem
Perovskite solar cells face instability issues due to exposure to heat, light, and air, leading to decreased performance and shortened lifetime, primarily due to halide ion elution and crystal structure damage.
Innovation Solution
Incorporation of polymer electrolyte layers with halide ions and amine groups in the perovskite solar cell structure, including a first polymer electrolyte layer with halide ions as a side chain and a second polymer electrolyte layer with an amine group, to form passivation layers that prevent halide ion elution and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If perovskite is used for photoactive layer to achieve high photoelectric conversion efficiency, then efficiency is improved, but halide ion elution occurs due to ionic bonds in crystal structure, causing crystal structure damage and exciton quenching
Solution Approach 1:
The patent introduces a polymer electrolyte layer containing halide ions as an intermediary between the perovskite photoactive layer and the hole transport layer. This mediator layer prevents direct interaction between perovskite and harmful environmental factors while maintaining charge transport, thereby preventing halide ion elution and crystal structure damage without compromising photoelectric conversion efficiency
Solution Approach 2:
The polymer electrolyte layer creates a protective environment around the perovskite photoactive layer, isolating it from external factors such as moisture and oxygen that could trigger halide ion elution. This inert barrier maintains the stability of the ionic bonds in the perovskite crystal structure while allowing the device to operate at high efficiency
2Ease of manufacture
If perovskite layer is exposed to heat, air, and light for manufacturing and operation, then device can be manufactured using solution process, but performance is lowered and lifetime is shortened due to material instability
Solution Approach 1:
The patent applies a polymer electrolyte layer before the perovskite layer is fully exposed to environmental stressors during operation. This preliminary protective measure prevents halide ion elution from occurring in the first place, thereby preserving device lifetime while maintaining the advantages of solution process manufacturing
Solution Approach 2:
The polymer electrolyte layer acts as a protective intermediary that allows the perovskite layer to maintain its instability characteristics during manufacturing (enabling solution process) while preventing this same instability from degrading device lifetime during operation
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 solution provides perovskite solar cells with high stability against heat, light, and air, maintaining 80% efficiency after 1,000 hours at 85°C, 350 hours of light exposure, and 1,500 hours in air, while increasing open-circuit voltage and photocurrent.
Implementation Method 1
a first polymer electrolyte layer which is formed on the hole transport layer and includes a halide
Implementation Method 2
form passivation layers that prevent halide ion elution and enhance stability
Implementation Method 3
a second polymer electrolyte layer which is formed on the electron transport layer and includes an amine group
Implementation Method 4
perovskite solar cell... high photoelectric conversion efficiency
Data Source
AI summary
Provided is a perovskite solar cell. The perovskite solar cell includes a bottom electrode; a hole transport layer formed on the bottom electrode; a first polymer electrolyte layer formed on the hole transport layer and including a halide; a perovskite photoactive layer formed on the first polymer electrolyte layer; an electron transport layer formed on the perovskite photoactive layer; a second polymer electrolyte layer formed on the electron transport layer and including an amine group; and a top electrode formed on the second polymer electrolyte layer.