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Fabrication of High Performance, Narrowband Blue-Selective Polymer Photodiodes with Dialkoxynaphthalene-Based Conjugated Polymer
- Fabrication of High Performance, Narrowband Blue-Selective Polymer Photodiodes with Dialkoxynaphthalene-Based Conjugated Polymer
- Yoon, Seong Won; Ha, Yeon Hee; Kwon, Soon Ki; Kim, Yun Hi; Chung, Dae Sung
- DGIST Authors
- Chung, Dae Sung
- Issue Date
- ACS Photonics, 5(2), 636-641
- Article Type
- Butyric acid; Conjugated polymers; Efficiency; Energy gap; Heterojunctions; II-VI semiconductors; Photodiodes; Sodium compounds; Solvents; Thorium compounds; Based conjugated polymers; Color selectivity; Detectivity; External quantum efficiency; nonabsorbing acceptor; Planar heterojunction structures; Space charge limited currents; [6 ,6]-phenyl-C61-butyric acid methyl esters; Quantum efficiency
- Here, we synthesized a dihexyloxynaphthalene-based conjugated polymer (PNa6-Th) to realize narrowband blue-selective polymer photodiode. The optical, electrochemical, and thermal properties of the synthesized polymer were investigated. It was found that PNa6-Th exhibited a blue-selective absorption with a narrow full width at half-maximum of ∼100 nm and a wide optical band gap of ∼2.52 eV. We constructed a planar heterojunction structure with PNa6-Th and ZnO as a blue-selective electron donor and nonabsorbing acceptor, respectively; To enhance the photodiode performance, a minor amount of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) was introduced on the donor layer. By introducing the PCBM on PNa6-Th layer, external quantum efficiency was increased from 5.4% for pristine device to 37.8% for 15 wt % PCBM-doped device, while the dark current values maintained nearly constant. This external quantum efficiency boost leads to high detectivity of 2.31 × 1012 Jones at -1 V. The physics behind the improved performance were fully discussed based on percolation pathway theory and space-charge-limited current analyses. © 2017 American Chemical Society.
- American Chemical Society
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