| 摘要 |
<p>A surface reflectivity of a solar cell is reduced by applying a nanopillar array including a plurality of nanopillars to the solar cell. Further, by constituting the nanopillars with a Si/SiGe superlattice and controlling a Ge composition ratio of a SiGe layer (2), excited electron and hole are spatially separated in different layers, thus increasing a carrier lifetime, and at the same time, an optical-electrical conversion efficiency is improved by a multi-exciton phenomenon due to a quantum confinement effect. In addition, by forming an intermediate band by thinning a Si layer (1) and the SiGe layer (2), a carrier extraction efficiency is improved.</p> |
