Empowering Semi-Transparent Solar Cells with Thermal-Mirror Functionality

Device architectures for semi-transparent perovskite solar cells are proposed that are not only highly efficient but also very effective in thermal-mirror operation. With the optimal top transparent electrode design based on thin metal layer capped with a high-index dielectric layer for selective transmittance in visible and high reflectance in near-infrared (NIR) region, the proposed see-through devices exhibit average power conversion efficiency as large as 13.3% and outstanding NIR rejection of 85.5%, demonstrating their great potential for ideal “energy-generating and heat-rejecting” solar windows that can make a smart use of solar energy.