Department of Physics
Highly sensitive near-infrared (NIR) organic phototransistors (OPTs) were fabricated using nanowire network based on a narrow bandgap donor-acceptor (D-A) polymer as the photoactive channel. The D-A polymer nanowire network-based NIR-OPTs exhibit high responsivity of ∼246 A/W under an NIR illumination source (850 nm) with a light intensity of ∼0.1 mW/cm2. This value is over one order of magnitude higher than that of the structurally identical planar D-A polymer thin film OPTs. The high performance of the nanowire network-based phototransistors is attributed to the excellent hole transport ability, reduced density of the structural defects in the polymer nanowires, and improved contact at the channel layer/electrode interfaces. The high sensitivity and low cost solution-fabrication process render this OPT technology appealing and practically viable for application in large area NIR sensors.
Organic phototransistor, Near-infrared detector, D-A polymer, Photoresponsivity
Source Publication Title
© 2017 Elsevier B.V. All rights reserved.
This work was financially supported by the Research Grants Council of Hong Kong Special Administrative Region, China, General Research Fund (GRF/12303114), Hong Kong Baptist University Faculty Research Grant (FRG2/15-16/072) and Inter-institutional Collaborative Research Scheme (RC-ICRS/15-16/04). Y.L. Lei also acknowledges the financial support from National Natural Science Foundation of China (Grant No. 11204247).
Link to Publisher's Edition
Lei, Yanlian, Ning Li, Wing-Kin Edward Chan, Beng S. Ong, and Furong Zhu. "Highly sensitive near infrared organic phototransistors based on conjugated polymer nanowire networks." Organic Electronics 48 (2017): 12-18.