An HZB team has been able to improve the efficiency of perovskite silicon tandem solar cells, by achieving about a 25.5 percent increase. This is the highest value to be ever published till date. The team employed computational simulations to research light conversions in numerous device designs through different kinds of nanostructured surface.
More Details about the Enhancements Brought in For Perovskite Silicon Tandem Solar Cells
The HZB team has now ensured that extensive optimization of light management and gain in detailed energy yield analyses is now possible. This study was recently published in Energy & Environmental Science.
The perovskite silicon tandem solar cells that comprise silicon and metal halide perovskite compounds are able to convert a substantially large part of the solar spectrum into electrical energy. But, a small portion of the light is reflected and is lost, thereby not taking part into the electrical conversion activities. By making use of nanostructures, the reflection can be decreased notably, furthermore leading towards improvement in the ability to capture more light.
In case of pyramid-shaped micro-features etched into the silicon wafers, the consequent microscopic roughness caused in the silicon surface cannot make it suitable as a substrate used in deposition of extremely thin perovskite layers. This is mainly due to the perovskites being normally deposited to a polished wafer by using solution processing to form an extremely thin film. This film will be much thinner than the pyramidal features. Thus, a rough-etched silicon surface layer prevents formation of a uniform conformal layer.
Apart from using these layers, the researchers have developed a highly detailed numerical model for complex 3-D features can interact with light. This model has made it clearer than before regarding how different device designs having numerous textures at different interfaces can affect efficiency. On the basis of these features, the above mentioned efficiency value can be realistically achieved, according to Marko Jošt, first author of the study.