3D Printed Masks and Transfer Stamping Process to Enable the Fabrication of the Hemispherical Organic Photodiodes

Abstract

Organic PhotodiodesToday, most of the current image sensors and cameras are based on flat focal plane array (FPA) technology, including charge coupled devices (CCDs), complementary metal oxide semiconductor (CMOS) imager, or thin film transistors (TFTs) arrays on glass substrates. [1][2][3] The planar FPA requires complex multielement lenses to correct the image surface; i.e., the Petzval surface. [4] The nonidealities of the optical system can lead to a distorted and blurred image due to off-axis aberrations. To correct these problems, additional optical elements and high precision lens system are required, which result in complex and expensive optical system. Compared to the camera system with the flat FPA, a curved image surface mimicking a spherical human retina provides numerous advantages. [5] The image system with the curved image surface can provide a wide field of view (FOV), a low optical aberration, low 1/f number and less optical lens components leading to compact, cheaper, and lighter camera system. [4,6,7] Over the years, the fabrication of image sensors on curved surface has long been a challenging task among researchers due to the difficulty of developing fabrication methods suitable for curved surfaces. To name a few, Ko et al. developed a

Additive Manufacturing of Conducting Polymers: Recent Advances, Challenges, and Opportunities

“…However, P3HT, which is one of the most popular semiconducting polymers used for solar cell applications, has been scarcely investigated using additive manufacturing. There are only a few examples concerning the additive manufacturing of P3HT:PCBM inks, employing SLA, slot–die coating, and aerosol-jet printing, , leading to artificial human eyes, medical sensors, generators, and transistors, respectively. In our opinion the AM of this polymer should find many opportunities in the near future.…”

Conductive PEDOT-Dominant Surface of Transparent Electrode Patch via Selective Phase Transfer for Efficient Flexible Photoelectronic Devices

“…Moreover, when additives are introduced for conductivity improvement, process time and cost requirements also increase. Therefore, a transfer process is proposed herein to simplify and accelerate the process and thus increase the performance of flexible organic optoelectronic devices. − The transfer process enhances the photodetector performance by increasing the conductivity of the electrode by improving the interface roughness with the upper layer. − It also improves driving stability by reducing mechanical deterioration during bending.…”