Organic-Inorganic Hybrid Solar Cell Triple-Layer Stability

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Solution Overview

Problem

Organic-inorganic hybrid solar cells face issues with low efficiency and stability due to vulnerability to moisture and phase transitions, which affect the lattice spacing and properties of the perovskite material used in the absorbing layer.

Innovation Solution

A triple-layer structure is implemented in the solar cell, with each light absorbing layer having distinct phase transition temperatures, where the first and second light absorbing layers have different phase transition temperatures, and the second and third layers also have different temperatures, stabilizing the crystal structure and enhancing interfacial characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single-layer perovskite absorbing layer is used, then the device structure is simple, but the stability deteriorates due to phase transition and lattice spacing changes at operating temperatures

Engineering Contradiction:

ImprovestructureVSAvoidstability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The single-layer perovskite absorbing layer is divided into multiple sub-layers (first light absorbing layer, second light absorbing layer, third light absorbing layer), each with different phase transition temperatures. This segmentation prevents phase transition at operating temperatures by ensuring that no single layer undergoes phase transition, thereby maintaining structural stability while retaining the benefits of a relatively simple overall device structure.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If a single-layer perovskite absorbing layer is used, then the manufacturing process is simple, but the energy conversion efficiency is low

Engineering Contradiction:

Improvemanufacturing processVSAvoidenergy conversion efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

Each light absorbing layer is designed with specific local qualities - different phase transition temperatures and complementary light absorption characteristics. The first layer absorbs primarily in one spectral region, the second layer in another region, and the third layer in yet another region. This local quality differentiation enables broader spectrum utilization and higher energy conversion efficiency while maintaining solution-processability and relatively simple manufacturing procedures.

Inventive Principle:

Principle #3Local quality

3Reliability

If a triple-layer structure with different phase transition temperatures is implemented, then the stability and phase transition resistance are improved, but the device complexity increases

Engineering Contradiction:

ImprovestabilityVSAvoidstructure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The phase transition temperature is used as a key parameter to differentiate the three light absorbing layers. By selecting materials with systematically different phase transition temperatures (first layer: higher, second layer: intermediate, third layer: lower), the patent achieves enhanced stability against phase transitions while maintaining a relatively organized and manageable triple-layer structure. This parameter-based differentiation provides a clear design framework that reduces the perceived complexity.

Inventive Principle:

Principle #35Parameter changes

4Stability of the object's composition

If a triple-layer structure with different phase transition temperatures is implemented, then the lattice spacing stability is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvelattice spacing stabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The patent employs preliminary action by pre-designing the triple-layer structure with carefully selected phase transition temperatures before manufacturing. The material composition and thickness of each layer are predetermined to ensure that their phase transition temperatures are staggered, preventing simultaneous phase transitions. This preliminary design approach simplifies the manufacturing process by providing clear fabrication guidelines while achieving superior lattice spacing stability.

Inventive Principle:

Principle #10Preliminary action

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

This configuration enhances the stability and energy conversion efficiency of the solar cell by suppressing lattice spacing phenomena and improving current density and light energy absorption, leading to improved performance and durability.

Implementation Method 1

the solar cell means a cell which produces current-voltage by using a photovoltaic effect of absorbing photoenergy from the sunlight to generate electrons and holes

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Implementation Method 2

the first light absorbing layer and the second light absorbing layer have different phase transition temperatures, and the second light absorbing layer and the third light absorbing layer have different phase transition temperatures

Methodology Applied

Scientific EffectPhase transition: Phase Change

Data Source

PatentUS10636580B2Organic-inorganic hybrid solar cell

Publication Date: 2020.04.28 LG CHEM LTD

AI summary

The present specification relates to an organic-inorganic hybrid solar cell.