Organic Photodetector Photoconversion Layers for Higher Photocurrent
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Solution Overview
Problem
Existing organic photodetectors face challenges in improving photocurrent density and signal-to-noise ratio, necessitating advancements in photodetector materials and structures.
Innovation Solution
The introduction of a photoconversion unit comprising specific electron donor and acceptor compounds, along with an additional compound having a root mean square roughness of ≥7 nm and enthalpy of fusion of ≥112 J/g, arranged between the anode and organic semiconductor layers, enhances the performance of organic photodetectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic photodetector materials and structures are used, then device simplicity is maintained, but photocurrent density and signal-to-noise ratio are insufficient
Solution Approach 1:
The patent employs composite materials by combining electron donor compounds, electron acceptor compounds, and additional compounds with specific properties (RMS roughness ≥7 nm, enthalpy of fusion ≥112 J/g) to form the photoconversion unit. This composite approach enhances photocurrent density and signal-to-noise ratio while managing the increased structural complexity through systematic material selection.
Solution Approach 2:
The invention applies local quality by positioning the photoconversion unit with specific material characteristics (roughness and enthalpy parameters) between the anode and organic semiconductor layer. This localized optimization of material properties in the photoconversion unit improves overall detector performance without requiring changes throughout the entire device structure.
2Productivity
If the photoconversion unit uses compounds with specific roughness and enthalpy properties, then photocurrent density improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies critical parameters for the additional compound (RMS roughness ≥7 nm, enthalpy of fusion ≥112 J/g) that directly influence photocurrent density. By establishing these parameter thresholds, the invention enables manufacturers to control deposition processes within defined ranges, balancing performance improvement with manufacturability.
Solution Approach 2:
The additional compound acts as an intermediary material between the electron donor/acceptor compounds and the organic semiconductor layer. Its specific roughness and enthalpy properties mediate the interaction between layers, facilitating improved charge transport and photocurrent generation while providing a buffer that simplifies the precision requirements for adjacent layer depositions.
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 results in improved photocurrent and signal-to-noise ratio in organic photodetectors, demonstrating enhanced efficiency and performance.
Implementation Method 1
Organic photodetectors have been developed inter alia for use in organic electronic devices such as displays... improved photocurrent density and improving the signal-to-noise ratio
Data Source
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AI summary
The present invention relates to an organic photodetector comprising a metal complex of formula (I), an organic electronic device comprising the organic phototector as well as an display device comprising the organic electronic device.