Electron Extraction Layer Bonding via Silyl Groups
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Solution Overview
Problem
Organic solar cells with zinc oxide electron extraction layers experience reduced photoelectric conversion efficiency due to weak hydrogen bonds between zinc oxide and ethanolamine, leading to insufficient heat stability.
Innovation Solution
Forming an electron extraction layer with an inorganic compound and an electron-donating group bonded via a silyl group to enhance the stability and durability of the photovoltaic element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electron extraction layer including zinc oxide in combination with an ethanolamine solution is used, then photoelectric conversion efficiency is improved immediately after preparation, but heat stability deteriorates due to weak hydrogen bonds
Solution Approach 1:
The patent changes the bonding mechanism parameter from hydrogen bonding to covalent bonding by introducing a silyl group-containing compound. This fundamental parameter change in the chemical bonding nature provides both high photoelectric conversion efficiency and superior heat stability, resolving the contradiction between immediate performance and thermal durability.
Solution Approach 2:
The patent creates a composite electron extraction layer combining zinc oxide particles with a silyl group-containing compound. This composite structure leverages the electron extraction capability of zinc oxide while the silyl group provides strong covalent bonding and heat stability, simultaneously achieving both improved photoelectric conversion efficiency and heat resistance.
2Stability of the object's composition
If zinc oxide alone is used as an electron extraction layer, then heat stability is improved, but photoelectric conversion efficiency deteriorates
Solution Approach 1:
The patent forms a composite electron extraction layer by combining zinc oxide particles with a silyl group-containing compound. The zinc oxide provides heat stability and structural integrity, while the silyl group-containing compound enhances photoelectric conversion efficiency through improved surface properties and electron extraction capability, thus resolving the contradiction between heat stability and photoelectric efficiency.
Solution Approach 2:
The patent modifies the surface chemistry parameter of zinc oxide by introducing a silyl group-containing compound. This parameter change in surface composition and electronic structure enhances the photoelectric conversion efficiency while maintaining the inherent heat stability of zinc oxide, simultaneously achieving both desired properties.
3Ease of manufacture
If hydrogen bonds are used to bond zinc oxide and electron-donating groups, then ease of manufacture is improved, but durability deteriorates due to weak bonding
Solution Approach 1:
The patent changes the bonding strength parameter from weak hydrogen bonds to strong covalent bonds by using a silyl group-containing compound. The covalent bonding provides superior durability and long-term stability while still allowing for relatively simple solution-based fabrication processes, thus resolving the contradiction between ease of manufacture and durability.
Solution Approach 2:
The patent substitutes the chemical bonding mechanism from hydrogen bonding to covalent bonding through the introduction of silyl groups. This substitution in bonding mechanism provides significantly enhanced durability and stability while maintaining compatibility with solution-based manufacturing methods, simultaneously achieving both ease of formation and long-term reliability.
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 method results in a photovoltaic element with improved heat stability and durability, maintaining high photoelectric conversion efficiency over time.
Implementation Method 1
an inorganic compound (A) and an organic compound (B) having an electron-donating group and a bonding group are bonded to each other via a bonding group of the organic compound (B)
Data Source
Figure 1
AI summary
There is provided a photovoltaic element having excellent durability owing to an electron extraction layer in which an inorganic compound and an electron-donating group are more firmly bonded to each other, and including at least a cathode, an electron extraction layer, an photoelectric conversion layer and an anode in this order, the electron extraction layer containing an inorganic compound (A), and an organic compound (B) having an electron-donating group and a bonding group, the electron extraction layer having an inorganic/organic hybrid structure in which the inorganic compound (A) and at least a part of the organic compound (B) are bonded to each other via the bonding group.