No abstract

Bathocuproine (BCP) is a well-studied cathode interlayer in organic photovoltaic (OPV) devices, where it for standard device configurations has demonstrated improved electron extraction as well as exciton blocking properties, leading to high device efficiencies. For inverted devices, however, BCP interlayers has shown to lead to device failure, mainly due to the clustering of BCP molecules on indium tin oxide (ITO) surfaces, which is a significant problem during scale-up of the OPV devices. In this work, we introduce C 70 doped BCP thin films as cathode interlayers in inverted OPV devices. We demonstrate that the interlayer forms smooth films on ITO surfaces, resulting from the introduction of C 70 molecules into the BCP film, and that these films possess both improved electron extraction as well exciton blocking properties, as evidenced by electron-only devices and photoluminescence studies, respectively. Importantly, the improved cathode interlayers leads to well-functioning large area (100 mm 2 ) devices, showing a device yield of 100%. This is in strong contrast to inverted devices based on pure BCP layers. These results are founded by the effective suppression of BCP clustering from C 70 , along with the electron transport and exciton blocking properties of the two materials, which thus presents a route for its integration as an interlayer material towards up-scaled inverted OPV devices.

No abstract

In recent years, a growing interest in flexible electronic devices has been the origin of the formation of extensive research in providing the best method for the production of these tools. In this context, manufacturing of flexible textile antennas due to opportunities to integrate unique technical attributes with their applications is highly regarded by researchers. Therefore, in this paper, using inkjet printing technology with textiles and subsequently reducing it by metal nanoparticles with various deposition techniques to develop micro-layers of fabric has been suggested. It is anticipated that this method can produce electrically conductive textiles with flexibility and signal transmission in different wavelengths. According to the method in this article, after primary preparation of polyester fabric, it will print active materials with different designs at suitable operating conditions and then it will enter into the nickel electroless bath. The antenna having a conductive nickel fabric as ground plane was tested at different angles than receivers. That indicating zero degree angle relative to a line perpendicular to the surface of the antenna has the gain equal to −5.34 dB, because most of the antenna radiation field is perpendicular to the surface of the antenna. The most unsuitable degree is 90° angle, which is equal to −14.59 dB and shows that radiation from the sides of the antenna does not occur.