16. ORGANIC PHOTOSENSOR FOR THE SHORT WAVELENGTH INFRARED REGION

Department: Electrical & Computer Engineering
Research Institute Affiliation: Agile Center for Wearable Sensors (CWS)
Faculty Advisor(s): Tse Nga Ng

Primary Student
Name: Weichuan Yao
Email: wyao@ucsd.edu
Phone: 858-534-4898
Grad Year: 2018

Student Collaborators
Zhenghui Wu, zhw220@eng.ucsd.edu

Abstract
Photosensors responsive to the short wavelength infrared (SWIR) spectra are used in a variety of applications including environmental monitoring, medical diagnosis and optical communications. Here we show our research efforts and progress towards demonstrating an organic photodiode with novel narrow bandgap polymers responsive in the SWIR region. The polymer semiconductors are processed by solution processing techniques to bypass the limitations of die transfer and bonding in conventional devices. We set up solution-processing equipment and device characterization system (current-voltage-illumination and photocurrent spectroscopy measurement), to identify the fundamental constraints in the exciton dissociation and charge collection processes as polymer bandgaps are reduced. So far we have fabricated and characterized preliminary samples with commercially available polymer (PTB7) and fullerene derivative (PC71BM), utilizing the structure of ITO/PEDOT:PSS/Bulk Heterojunction (BHJ)/Al. The instrumentation capability and preliminary results pave the way to making the SWIR photodiode with suitable polymers and design of device structures.

Industry Application Area(s)
Electronics/Photonics | Materials | Semiconductor

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