Perovskite solar cells being lighter, flexible and cheap unlock efficiency performance of devices.
A study was published in the Science journal on February 8, 2019, sponsored by National Science Foundation and U.S Department Energy which reported that researchers at Massachusetts Institute of Technology, Georgia Institute of Technology and University of California San Diego assessed that perovskite solar cell increase efficiency of the devices. The cells are lightweight and can be manufactured with plastic substrates which are flexible.
However, in order for the perovskite solar cells to compete with the conventional silicon solar cells they were required to be more efficient. Therefore, a team of researchers felt that in order to achieve the ultimatum it was important to learn the crystalline structure of perovskites. The triad structure of the crystal is formed by lead, second by organic compounds and third by halides such as iodine or bromine. In the recent past, it was already proved that adding rubidium and cesium with the mixture of iodine and bromine accounts to stabilize performance of perovskites. However, it was not clear as to why the alkali metals improved its performance. In order to understand the concept better, the researchers used X-ray mapping to study the perovskites at nanoscale. It was concluded that on adding rubidium and cesium to the iodine-bromine mixture, the latter were more homogenously mixed resulting in two percent higher efficiency of devices.
Researchers also observed that after adding the rubidium and cesium, halide metals remained clustered preventing proper current flow in the solar cells. It was surprising because such dead zones would probably kill a solar cell, thereby losing current. However, in case of perovskites, the dead zones did not affect the super performance of the cells. Although there was a little loss of current, there is always room for improvement. Thus, the perovskites are promising materials concerning low cost, high performance and light-weight.
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