Hole-Transporting Layer Composition for Low-Illuminance Photoelectric Output

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing photoelectric conversion elements struggle to maintain high output and stability under low illuminance conditions, such as indoor lighting, with significant variations in output over time.

Innovation Solution

Incorporating a hole-transporting layer composed of tertiary amine pyridine and secondary amine pyridine compounds, along with a hole-blocking layer, to enhance the performance of photoelectric conversion elements, particularly in low light environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional photoelectric conversion elements are used, then they can generate electricity from light, but they show significant output variations and instability under low illuminance conditions

Engineering Contradiction:

Improveoutput stabilityVSAvoidoutput consistency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the chemical composition parameters of the hole-transporting layer by incorporating specific ratios of tertiary amine pyridine compounds (20-80 mass%) and secondary amine pyridine compounds (20-80 mass%). This parameter optimization resolves the contradiction by achieving both high output stability (improving reliability) and consistent electricity generation (improving productivity) under low illuminance conditions through precise compositional control

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the hole-transporting layer composition is optimized for high output, then electricity generation improves, but output variations over time increase

Engineering Contradiction:

Improveelectricity generationVSAvoidoutput variation over time

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent creates a composite hole-transporting layer material combining tertiary amine pyridine compounds and secondary amine pyridine compounds in specific ratios (20-80 mass% each). This composite material approach resolves the contradiction by achieving high electricity generation productivity while maintaining stable composition over time, reducing output variations through the synergistic combination of both compound types

Inventive Principle:

Principle #40Composite materials

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 proposed configuration enables high output and stable performance with low illuminance, reducing output variations and maintaining consistent electricity generation.

Implementation Method 1

a photoelectric conversion layer including an electron-transporting layer and a hole-transporting layer

Methodology Applied

Scientific EffectPhotoelectric conversion: Photovoltaic Effect

Data Source

PatentEP4125105B1Title of the invention photoelectric conversion element, photoelectric conversion module, and electronic device

Publication Date: 2026.02.25 RICOH CO LTD

Figure 1~2
Figure 3~4
Figure 5~6

AI summary

A photoelectric conversion element (101) including a first electrode (2, 2a, 2b), a photoelectric conversion layer, and a second electrode (7, 7a, 7b). The photoelectric conversion layer includes a hole-transporting layer (6), and the hole-transporting layer (6) includes a tertiary amine pyridine compound and a secondary amine pyridine compound.