Thin Film module like temperature coefficients enable 5-12% additional energy harvest in arid climates. Silevo’s proprietary technology enables low temperature coefficients, which translate into more power output during the hottest times of the day and in warmer climates.
Solar modules are all typically rated at Standard Test Conditions (STC) however in a real world environment they generate less power as they heat up. The rate of decline is directly correlated to the choice of device architecture and materials utilized to produce a module. Silevo’s tunneling junction device is the first high efficiency device that also enables world class temperature coefficients of -0.22%/C at a cell level, as validated by Sandia National Labs. The figure below shows the conversion efficiency and decay rate of several different technologies. Thin Film modules have typically benefited from less decay in hot weather however their efficiency is very low. Conversely standard diffusion based c-Si devices with higher efficiencies as well as the iterative selective emitter devices suffer from very poor temperature coefficients of -0.45 – -0.50%/C, leading to large energy harvest losses in real-world conditions.
Comparing Efficiency Loss of various technologies
Silevo’s tunneling oxide layer coupled with thin film passivation creates the superior junction quality and high Voc – the foundation for reaching low temperature coefficients. Recent data has shown that low temperature coefficients of -0.25%/C at a panel level can translate into 4-12% energy harvest improvements. For large installations, energy harvest power advantage contribute directly to project bottom lines, and can translate into overall system cost savings of $0.16/Wp to $0.30/Wp on a $3.00/Wp system.