Here's why:

* Solar cells are designed to absorb photons in the visible and near-infrared spectrum: They are specifically tuned to absorb photons with enough energy to excite electrons in the semiconductor material, generating electricity. Infrared photons lack sufficient energy for this process.

* Infrared radiation has lower energy: Infrared radiation has wavelengths longer than visible light, meaning its photons carry less energy. This energy is not enough to overcome the band gap in most solar cell materials.

However, there are some potential exceptions:

* Emerging technologies: Some researchers are exploring new materials and technologies that might be able to capture energy from infrared radiation. These technologies are still in early stages of development.

* Thermoelectric generators: These devices use temperature differences to generate electricity. Infrared radiation can be used to heat a thermoelectric generator, potentially generating a small amount of power.

In summary: While standard solar cells don't utilize infrared radiation, there are some emerging technologies that might someday make it possible to harvest energy from this part of the electromagnetic spectrum.