Publications de Wei-Hsu Hu | EPFL Graph Search

Formation of electron traps in semiconducting polymers via a slow triple-encounter between trap precursor particles

Already in 2012, Blom et al. reported (Nature Materials 2012, 11, 882) in semiconducting polymers on a general electron-trap density of approximate to 3 x 10(17) cm(-3), centered at an energy of approximate to 3.6 eV below vacuum. It was suggested that tra ...

2024

Photomultiplication Enabling Efficient Shortwave Infrared-Sensitive Organic Upconversion Devices

Frank Nüesch, Wei-Hsu Hu

Organic upconverters made by integrating an infrared-sensitive photodetector with a light-emitting diode offer a low-cost route to visualize images taken in the infrared. However, making such devices sufficiently efficient is challenging. Here, upconversio ...

WILEY-V C H VERLAG GMBH2024

Shortwave Infrared-Sensitive, Narrowband Organic Upconversion Devices with a Gain

Wei-Hsu Hu

Sensing and imaging of light in the shortwave infrared (SWIR) range is increasingly used in various fields, including bio-imaging, remote sensing, and semiconductor process control. SWIR-sensitive organic photodetectors (OPDs) are promising because organic ...

EPFL2024

High-Permittivity Polysiloxanes for Bright, Stretchable Electroluminescent Devices

Frank Nüesch, Wei-Hsu Hu

Stretchable alternating current electroluminescent (ACEL) devices have a bright future in wearable electronics and soft robotics. Still, their market application is hindered by high operating voltages. The voltage can be reduced by increasing the relative ...

Wiley-V C H Verlag Gmbh2024

Squaraine Dyes for Single-Component Shortwave Infrared-Sensitive Photodiodes and Upconversion Photodetectors

Frank Nüesch, Wei-Hsu Hu, Mohammad Jafarpour

Sensitive detection of shortwave infrared (SWIR) light using organic dyes will be a significant advance toward many applications in industry and research. Furthermore, from a fabrication and optimization view, photogeneration of charges in diodes consistin ...

2023

On the Response Speed of Narrowband Organic Optical Upconversion Devices

Frank Nüesch, Roland Hany, Surendra Babu Anantharaman, Wei-Hsu Hu, Matthias Diethelm

Organic upconversion devices (OUCs) consist of an organic infrared photodetector and an organic visible light-emitting diode (OLED), connected in series. OUCs convert photons from the infrared to the visible and are of use in applications such as process c ...

WILEY-V C H VERLAG GMBH2022

Electron Trap Dynamics in Polymer Light-Emitting Diodes

Frank Nüesch, Roland Hany, Michael Bauer, Wei-Hsu Hu, Matthias Diethelm

Semiconducting polymers are being studied intensively for optoelectronic device applications, including solution-processed light-emitting diodes (PLEDs). Charge traps in polymers limit the charge transport and thus the PLED efficiency. It is firmly establi ...

WILEY-V C H VERLAG GMBH2022

Traps for Electrons and Holes Limit the Efficiency and Durability of Polymer Light-Emitting Electrochemical Cells

Frank Nüesch, Wei-Hsu Hu, Camilla Arietta Vael-Garn

Polymer light-emitting electrochemical cells (PLECs) and light-emitting diodes (PLEDs) receive interest for large-area lighting and signage applications. During operation of a PLEC, a p-i-n junction develops where electrons and holes are injected into the ...

2022