Non‐Halogenated Solvent Processed Shortwave Infrared Organic Photodetectors Using Sub‐1 eV Bandgap Acceptor with Cyano Substitution
Abstract
Abstract Shortwave infrared (SWIR) organic photodetectors (OPDs) offer significant potential but face persistent challenges such as limited responsivity and high noise under reverse bias. This work presents the development of high‐performance OPDs for SWIR sensing, leveraging a newly designed non‐fullerene acceptor (NFA) named 6CN. The 6CN molecule, featuring a fused‐cyclopentadithiophene (fCPDT) core and cyano‐substituted π‐bridges, exhibits an ultra‐narrow optical bandgap of ≈0.98 eV, enabling efficient SWIR absorption up to 1250 nm. When blended with the PTB7‐Th polymer donor, the resulting bulk‐heterojunction (BHJ) demonstrates strong charge transfer, broad spectral coverage, and robust charge transport. Notably, device fabrication employs the environmentally friendly solvent o‐xylene without halogenated additives, yielding OPDs with superior photoresponse compared to those processed from conventional chlorinated solvents. The o‐xylene processed devices achieve high responsivity (≈0.2 A W −1 at 1200 nm) and specific detectivity exceeding 3 × 10 11 Jones across 300–1200 nm, representing a significant advance for eco‐friendly, flexible SWIR photodetection technologies.
Article Details
Authors (16)
Hoang Mai Luong
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
Jong‐Woon Ha
Department of Materials Engineering and Convergence Technology Gyeongsang National University (GNU) Jinju 52828 Republic of Korea
Hiba Wakidi
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
Sangmin Chae
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
Ahra Yi
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
Subhrangsu Mukherjee
Department of Physics and Organic and Carbon Electronics Laboratories (ORaCEL)
Sang Do
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
Vivian Worthington
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
Brian Minki Kim
Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
Zhong‐Ze Qu
Center for Polymers and Organic Solids (COPS), Departments of Chemistry and Biochemistry University of California Santa Barbara CA USA
Hyo Jung Kim
Plant Biology Section, School of Integrative Plant Science, Cornell University
Un‐Hak Lee
Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu Republic of Korea
Sung Cheol Yoon
Advanced Materials Division Korea Research Institute of Chemical Technology (KRICT) Daejeon 34114 Republic of Korea
Harald Ade
Department of Physics and Organic and Carbon Electronics Laboratories (ORaCEL)
Seo‐Jin Ko
Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu Republic of Korea
Thuc‐Quyen Nguyen
Center for Polymers and Organic Solids (COPS), Departments of Chemistry and Biochemistry University of California Santa Barbara CA USA