Buffer Layer Structure for Stable Light-Receiving Voltage
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Solution Overview
Problem
Existing light-receiving devices experience an increase in driving voltage, which is not effectively addressed by current technologies.
Innovation Solution
Incorporating a buffer layer with an electron-withdrawing organic compound between the active layer and the electron-transport layer in the light-receiving device structure, which includes a heteroaromatic compound with electron-withdrawing groups, helps to inhibit the increase in driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light-receiving device structure is used, then the device can perform photoelectric conversion, but the driving voltage increases over time
Solution Approach 1:
A buffer layer is introduced as an intermediary between the active layer and the electron-transport layer. This buffer layer contains an organic compound with electron-withdrawing properties that facilitates efficient electron transfer, thereby preventing the increase in driving voltage while maintaining the photoelectric conversion function.
Solution Approach 2:
The electronic properties of the buffer layer are optimized by selecting organic compounds with specific electron-withdrawing capabilities. By adjusting the electron affinity and HOMO/LUMO levels of the buffer layer material, efficient electron transfer is achieved, which stabilizes the driving voltage during device operation.
2Use of energy by moving object
If the buffer layer with electron-withdrawing compound is added, then the driving voltage increase is inhibited, but the device structure becomes more complex
Solution Approach 1:
The light-receiving device is segmented into distinct functional layers: an active layer for light absorption and charge generation, a buffer layer for electron transfer optimization, and an electron-transport layer for charge transport. This segmentation allows each layer to be independently optimized for its specific function, achieving driving voltage stability while maintaining a manageable structural complexity.
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 buffer layer effectively reduces the driving voltage requirements in the light-receiving device by facilitating efficient electron transfer, thereby enhancing the device's performance.
Implementation Method 1
the buffer layer includes an organic compound having an electron-withdrawing group
Data Source
AI summary
A light-receiving device in which an increase in driving voltage is inhibited is provided. Any of the following light-receiving devices is provided: a light-receiving device that includes a light-receiving layer between a pair of electrodes and in which the light-receiving layer includes an active layer, a buffer layer, and an electron-transport layer, the buffer layer is between the active layer and the electron-transport layer and is in contact with the active layer, and the buffer layer includes an organic compound having an electron-withdrawing group; a light-receiving device that includes a light-receiving layer between a pair of electrodes and in which the light-receiving layer includes an active layer, a buffer layer, and an electron-transport layer, the buffer layer is between the active layer and the electron-transport layer and is in contact with the active layer, and the buffer layer includes a heteroaromatic compound having an electron-withdrawing group.