Light-Receiving Layer Buffer Structure for Stable Driving Voltage

The patent introduces a buffer layer as an intermediary component between the active layer and the electron-transport layer. This buffer layer mediates the interaction between electrons generated in the active layer and the electron-transport layer, facilitating smoother electron transfer and reducing the energy barrier, thereby preventing driving voltage increase while maintaining reliable photoelectric conversion function.

The patent modifies the energy level parameters of the light-receiving device by selecting materials with specific HOMO and LUMO levels for the buffer layer. By carefully controlling the energy level alignment (where the LUMO level of the buffer layer is higher than that of the active layer and lower than that of the electron-transport layer), the device optimizes electron transport efficiency and prevents driving voltage increase without compromising photoelectric conversion reliability.

The buffer layer serves as a mediator that maintains stable electron transport over extended operational periods. By facilitating consistent electron transfer from the active layer to the electron-transport layer, it prevents the accumulation of charge imbalances that would otherwise cause driving voltage increases, thereby enabling prolonged operational duration with maintained reliability.

The patent ensures continuous and efficient electron transport through the buffer layer, which maintains stable photoelectric conversion performance over time. The proper energy level alignment in the buffer layer prevents electron trapping and maintains continuous electron flow, allowing the device to operate for extended periods without driving voltage increase, thus achieving both long duration and high reliability.