Plastic Near-Infrared Photodetectors Utilizing Low Band Gap Polymer
✍ Scribed by Y. Yao; Y. Liang; V. Shrotriya; S. Xiao; L. Yu; Y. Yang
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 256 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0935-9648
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✦ Synopsis
Organic photodetectors (PDs) have been the subject of extensive research in the past decade due to several inherent advantages: large-area detection, wide selection of materials, and low-cost fabrication on flexible substrates. High external quantum efficiency (EQE) [1,2] , full-color [3,4] , fast-response [5,6] , and position-sensitive [7] PDs have been reported in the past. However, there are few reports on organic near-infrared photodetectors (NIR-PDs) in spite of their tremendous potential in industrial and scientific applications, such as remote control, chemical/biological sensing, optical communication, and spectroscopic and medical instruments. [8] S. Meskers and co-workers reported an infrared PD in which doped poly(2, 4-ethylenedioxythiophene)/poly(styrene sulfonic acid) (PEDOT/PSS) was used as the active material. [9] More recently, G. Konstantatos and coworkers fabricated NIR-PDs by spin-coating colloidal quantum dots from solution onto gold interdigitated electrodes. [10] The device showed a large photoconductive gain and high detectivity at 1.3 lm. However, 3-dB bandwidth was only about 18 Hz and the working voltage was as high as 40 V. These characteristics strongly restrict their applications in the fields of imaging and communication where high-speed and low-power PDs are desired. Thus, there is a strong need for the development of fast response and low working voltage NIR-PDs while simultaneously maintaining the benefit of low-cost solution process. Here we report an organic near-infrared photodetector using a new low band gap polymer. By utilizing an ester group mod-COMMUNICATION