Light Sensing Element Second Electrode Doping
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Solution Overview
Problem
Existing electronic devices with light sensing elements face inefficiencies in converting incident light to electric signals, limiting their sensitivity and performance.
Innovation Solution
The electronic device incorporates a light sensing element with a photoelectric conversion layer comprising an electron donor and acceptor compound, and a second electrode made of metal and organic compound, where the organic compound is doped within a specific concentration range, enhancing the conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light sensing element uses conventional electrode and layer structures, then the device structure is simple, but the photoelectric conversion efficiency is low
Solution Approach 1:
The patent changes the material parameters of the second electrode by incorporating organic compounds with specific doping concentrations (0.5% to 10%) into metal materials with work functions ≥3.0 eV. This parameter optimization enhances electron extraction efficiency from the photoelectric conversion layer, directly improving photoelectric conversion efficiency without fundamentally altering the device structure.
Solution Approach 2:
The second electrode is designed as a composite material combining metal (for work function ≥3.0 eV) and organic compound (for electron transport). This composite structure leverages the advantages of both materials: the metal provides high work function for efficient electron extraction, while the organic compound facilitates electron transport, thereby improving overall photoelectric conversion efficiency.
2Reliability
If the second electrode uses high work function metal, then electron extraction efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a doping concentration range of 0.5% to 10% for organic compounds in the second electrode, which balances electron extraction efficiency with manufacturing feasibility. This parameter range ensures sufficient electron extraction while allowing for practical manufacturing tolerances, reducing the stringency of precision requirements compared to extreme parameter values.
3Reliability
If the organic compound doping concentration is increased, then electron transport improves, but sheet resistance increases
Solution Approach 1:
The patent optimizes the organic compound doping concentration within the range of 0.5% to 10% to achieve the best balance between electron transport efficiency and sheet resistance. This optimized concentration range ensures sufficient electron transport capability while minimizing the increase in sheet resistance, thereby improving overall device performance without excessive energy loss.
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 improves the light sensing element's efficiency by facilitating electron extraction and injection, resulting in improved transmittance and low sheet resistance, thereby enhancing photoelectric conversion efficiency.
Implementation Method 1
a light sensing element which may include a first electrode, a hole transport region disposed on the first electrode, a photoelectric conversion layer disposed on the hole transport region
Implementation Method 2
The second electrode may include a metal and an organic compound, and a doping concentration of the organic compound may be in a range of about 0.5% to about 10%
Data Source
AI summary
Embodiments provide an electronic device that includes a display element layer disposed on a base layer and including at least one light sensing element. The light sensing element includes a first electrode, a hole transport region disposed on the first electrode, a photoelectric conversion layer disposed on the hole transport region, an electron transport region disposed on the photoelectric conversion layer, and a second electrode disposed on the electron transport region, wherein the second electrode comprises a metal and an organic compound, and a doping concentration of the organic compound is in a range of about 0.5% to about 10%.