Attaining photovoltaic power generation for over 1,000 constant hours, performance more than 20%.

• NIMS has created a durable 1-cm2 perovskite solar cell capable of generating electricity for greater than 1,000 continual hrs at a photoelectric conversion performance (i.e., power generation efficiency) of greater than 20% in direct exposure to sunlight. Since this solar cell can be made externally of a plastic product at around 100 ° C, this technique may be utilized to create light, versatile solar cells.

Solar cells have actually been a vital component of decarbonization plans, making them the topic of extreme research study around the globe. Perovskite solar cells are a possibly promising next-generation solar cell technology due to the fact that they can be generated more easily as well as at lower expense than traditional solar cells. Nonetheless, perovskite solar cells additionally have negative aspects: they are prone to destruction when they respond with water molecules and also it had verified difficult to make them both durable and very reliable.

A lot of perovskite solar cells have similar power generation mechanisms. When the perovskite layer absorbs sunlight, it creates electrons and openings. These electrons and openings after that migrate separately right into the surrounding electron transport layer as well as hole transport layer, respectively, where they stream to generate an electrical present. To simultaneously improve the performance and also sturdiness of perovskite solar cells, these layers and also the interfaces in between them require to allow electrons as well as openings to move with them extra openly while making the user interfaces impermeable to water molecules.

This research group included a hydrazine derivative containing water repellent fluorine atoms (5F-PHZ) to the interface in between the electron transportation layer as well as the perovskite layer (composed of a crystalline framework, FA0.84 Cs0.12 Rb0.04 PbI3, which can be revealed simply by ABX3, where A = a mix of formamidinium ions (FA+), Cs+ and Rb+; B = Pb2+; and X = I-).

This user interface successfully stopped water molecules that have actually passed through the electron transportation layer from entering contact with the perovskite layer, thus improving the longevity of the solar cell. Using this interface likewise minimized the variety of crystalline defects that based on the surface area of the perovskite layer-- a root cause of reduced power generation performance. Additionally, the team added a phosphonic acid by-product (MeO-2PACz) to the interface between the hole transportation layer and the perovskite layer, which lessened defect development in the hole transportation layer and also thereby improved the power generation effectiveness of the solar cell.

The research is published in Advanced Energy Materials. In future research, the group prepares to establish much more efficient as well as durable perovskite solar cells by developing a data source of molecules that can be integrated into the interface, performing data-driven research study and also designing molecules that can be used to boost interfacial residential or commercial properties.