This paper presents a groundbreaking development in the field of organic photodetectors, introducing a novel dual-mode photodetector with exceptional thickness capabilities. The technology is achieved through the innovative use of multilayer blade coating techniques, enabling the seamless transition between narrowband and broadband modes through the application of bias. This pioneering device, termed the "Bias Switchable Narrowband-Broadband Near-Infrared (NIR) Organic Photodetector," is manufactured in ambient conditions and offers several distinct advantages, including dual-mode operation, halogen-free solvent usage, ambient fabrication conditions, and scalability in the manufacturing process.
Organic light-emitting field-effect transistors are a new class of electrooptical devices that could
provide a novel architecture to address open questions concerning fundamental optoelectronic
phenomena in organic semiconductors, and can be potentially used as key components in optical
communication systems, advanced display technology, solid-state lighting and organic lasers.
The realisation of Organic Light-Emitting Transistors (OLETs) with high quantum efficiency and
fast switching time is crucial for the development of highly integrated organic optoelectronic
systems. Organic molecular materials having intrinsically ambipolar transport and high charge
mobility values are restricted in number and show poor light-emission efficiency. Here, we describe
the device operation principles of OLETs and report on the approach of combining p-type and n-type
molecular materials in a layered structure to achieve ambipolar transport and light emission. Imaging
of the individual layers and a correlation between active layer structure and device electrical
performances is achieved by means of the Laser Scanning Confocal Microscopy.
KEYWORDS: Absorption, Polymers, Solar cells, Fullerenes, Photovoltaics, Quantum efficiency, Heterojunctions, Molecules, Organic photovoltaics, Solar energy
Organic solar cells based on interpenetrating networks of conjugated polymer donors and fullerene-based acceptors with MA 1.5 efficiencies up to 3% were presented recently. For further improvement of the efficiency, the absorption of the solar light should be increased. This can be done by matching the active layer absorption better to the terrestrial solar emission spectrum and by increasing the absorption coefficient.
In this contribution we present a combined spectroscopic and device study of novel materials that extend the absorption to the red. The systems studied are, among others, low bandgap polymers as electron donors or dye sensitized fullerene compounds.
The photophysical properties are investigated by excited state spectroscopy and the materials are discussed with regard to their suitability for efficient photoinduced charge generation.
The photovoltaic activity is demonstrated by photocurrent action spectra as well as by AM 1.5 efficiencies of prototype devices made using these novel materials.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.