Photoelectric Device Electron Auxiliary Layer Infrared Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current photoelectric devices face challenges in achieving high photoelectric conversion efficiency, particularly in the infrared wavelength range, while also maintaining low dark current and thermal stability.
Innovation Solution
A photoelectric device is designed with a structure comprising a first electrode, a second electrode, an active layer, and an electron auxiliary layer, where the electron auxiliary layer includes specific compounds represented by Chemical Formulas 1 to 4, which enhance electron transport properties, and a hole auxiliary layer is included to improve hole transport, forming a microcavity structure with the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photoelectric devices are used, then general photoelectric conversion is achieved, but photoelectric conversion efficiency in the infrared wavelength range is insufficient
Solution Approach 1:
The patent modifies the energy level parameters of the electron auxiliary layer by selecting compounds with specific HOMO and LUMO energy levels. The LUMO energy level is set to 2.5-3.5 eV and HOMO energy level to 5.5-6.5 eV to optimize infrared photon absorption and electron-hole pair generation, directly improving photoelectric conversion efficiency in the infrared range
Solution Approach 2:
The patent employs a composite structure combining the active layer with an electron auxiliary layer made of specific organic compounds (represented by Chemical Formulas 1-4). This composite material system enhances the overall photoelectric conversion performance by leveraging the complementary properties of each layer, particularly for infrared wavelength detection
2Measurement precision
If sensitivity in low-light environments is improved, then detection capability is enhanced, but dark current increases
Solution Approach 1:
The patent applies local quality optimization by introducing an electron auxiliary layer with specific electronic properties between the active layer and electrode. This localized modification creates favorable energy level alignment at the interface, enabling efficient electron extraction while blocking dark current, thus improving detection sensitivity without proportionally increasing dark current
Solution Approach 2:
The electron auxiliary layer acts as an intermediary between the active layer and the electrode. It mediates the electron transport process by providing optimal energy level matching, which facilitates photoelectron extraction while maintaining a barrier against thermally generated dark current, thereby improving the signal-to-noise ratio in low-light conditions
3Productivity
If photoelectric conversion efficiency is enhanced, then performance is improved, but thermal stability deteriorates
Solution Approach 1:
The patent selects electron auxiliary layer compounds with specific thermal and electronic parameters. The HOMO energy level (5.5-6.5 eV) and LUMO energy level (2.5-3.5 eV) are optimized not only for photoelectric conversion efficiency but also for thermal stability, ensuring the device maintains performance under varying temperature conditions
Solution Approach 2:
The patent employs organic compounds with high thermal stability and chemical inertness for the electron auxiliary layer. These materials create a stable, inert environment within the device structure that protects against thermal degradation while maintaining efficient charge transport, thus achieving both high photoelectric conversion efficiency and thermal stability
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 device exhibits improved photoelectric conversion efficiency, reduced dark current, and enhanced thermal stability, particularly in the infrared wavelength range, making it suitable for applications in low-light environments and biometric sensors.
Implementation Method 1
an active layer between the first electrode and the second electrode
Implementation Method 2
an electron auxiliary layer between the second electrode and the active layer, wherein the electron auxiliary layer includes any one compound selected from compounds represented by Chemical Formulas 1 to 4
Data Source
AI summary
A photoelectric device includes a first electrode, a second electrode facing the first electrode, an active layer between the first electrode and the second electrode, and an electron auxiliary layer between the second electrode and the active layer, wherein the electron auxiliary layer includes any one compound selected from compounds represented by Chemical Formulas 1 to 4 and any combination thereof.