Sekisui Chemical has announced that it will provide and install film-type perovskite solar cells to Umekita (Osaka) Station, to be developed by West Japan Railway Company.

The Company claims it has achieved outdoor durability of 10 years equivalent by means of original “sealing, film formation, materials and process technology,” creating a 30 cm-wide roll-to-roll manufacturing process. This manufacturing process has been successfully used to produce film-type perovskite solar cells with power generation efficiency of 15.0%. Currently, work is aiming to establish a manufacturing process for 1 m-wide rolls that offers more improvements in durability and power generation efficiency with a view to practical application and the New Energy and Industrial Technology Development Organization (NEDO) Green Innovation Fund is being leveraged to speed up development.

Researchers from the University of Surrey's Advanced Technology Institute (ATI), KIOS Research and Innovation Center of Excellence at the University of Cyprus, China's Zhengzhou University, and the UK's National Physical Laboratory (NPL) have demonstrated a new photo-rechargeable system, which merges zinc-ion batteries with perovskite solar cells.

(a) device configuration and (b) working principle of the integrated flexible photo-rechargeable system. Credit: Energy Storage Materials

The new system could allow wearables to charge without the need to plug in. In fact, as little as thirty seconds of sunlight could boost the battery life of future smartwatches and other wearables by tens of minutes. The new environmentally friendly, photo-rechargeable system is unique because of its elegant design between the integrated battery and solar cell, allowing it to demonstrate high energy and volume density comparable to state-of-the-art micro-batteries and supercapacitors. 

Scientists from Syracuse University, South Dakota State University and Huzhou University have examined the use of polyaniline as a material for improved perovskite solar cells. The team demonstrated a facile, low-cost fabrication route for polyaniline hole transport mechanisms that display enhanced power conversion efficiency compared to conventional PEDOT:PSS hole transport layers in perovskites. This could provide a route toward low-cost, high-efficiency perovskite solar cells.

PEDOT:PSS is a commonly used material in perovskites, used as a hole transport layer between the photoactive perovskite layer and indium tin oxide layer. Using PEDOT:PSS improves the power conversion efficiency of perovskite solar cells. However, several issues have been observed with PEDOT:PSS. One of the fundamental issues is the degradation of active layers and defect formation associated with the large particle size of this material. Moreover, the use of this material as a hole transport layer is hindered by issues with low electrical conductivity limits and cost.

Researchers from Ulsan National Institute of Science and Technology (UNIST), Wuhan University of Technology and Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory have announced their success in manufacturing a high-efficiency, stable perovskite solar cell through a vacuum thin film deposition process.

Vacuum thin film deposition is a technique that is already widely used in the manufacture of large OLED TVs by evaporating raw materials in a vacuum and coating them thinly on a substrate. The perovskite solar cell developed this way displayed a photovoltaic-to-electricity conversion efficiency of 21.4%, which the team said is the highest among perovskite solar cells manufactured by vacuum thin film deposition process.