AI Article Synopsis
- The study explores a hybrid system using quantum dots and graphene to create synaptic-like behavior, activating excitatory and inhibitory functions with linearly polarized light.
- Perovskite quantum dots increase photocurrent, while PbS quantum dots decrease it, with a polarizer controlling which device dominates current output based on the light's polarization.
- Changing the polarization angle allows for fine-tuning of the current weight, enabling processes similar to potentiation (increasing response) and habituation (decreasing response).
Article Abstract
We demonstrate excitatory and inhibitory properties in a single heterostructure consisting of two quantum dots/graphene synaptic elements using linearly polarized monochromatic light. Perovskite quantum dots and PbS quantum dots were used to increase and decrease photocurrent weights, respectively. The polarization-dependent photocurrent was realized by adding a polarizer in the middle of the PbS quantum dots/graphene and perovskite quantum dots/graphene elements. When linearly polarized light passed through the polarizer, both the lower excitatory and upper inhibitory devices were activated, with the lower device with the stronger response dominating to increase the current weight. In contrast, the polarized light was blocked by the polarizer, and the above device was only operated, reducing the current weight. Furthermore, two orthogonal polarizations of light were used to perform the sequential processes of potentiation and habituation. By adjustment of the polarization angle of light, not only the direction of the current weight but also its level was altered.
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| http://dx.doi.org/10.1021/acs.nanolett.4c00124 | DOI Listing |
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