Journal Article10.1021/ACSAMI.7B15730
Three-Phase Morphology Evolution in Sequentially Solution-Processed Polymer Photodetector: Toward Low Dark Current and High Photodetectivity
Hanyu Wang,Shen Xing,Yifan Zheng,Yifan Zheng,Jaemin Kong,Junsheng Yu,André D. Taylor,André D. Taylor +7 more
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TL;DR: The improved performance of SSP PPDs is also due to the enhanced optical absorption, improved P3HT crystallinity, increased charge carrier mobilities, and suppressed bimolecular recombination.
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Abstract: Sequentially solution-processed polymer photodetectors (SSP PPDs) based on poly(3-hexylthiophene-2,5-diyl) (P3HT)/[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) are fabricated by depositing the top layers of PC71BM from an appropriate cosolvent of 2-chlorophenol (2-CP)/o-dichlorobenzene (ODCB) onto the predeposited bottom layers of P3HT. By adjusting the ratio of 2-CP/ODCB in the top PC71BM layers, the resulting SSP PPD shows a decreased dark current and an increased photocurrent, leading to a maximum detectivity of 1.23 × 1012 Jones at a wavelength of 550 nm. This value is 5.3-fold higher than that of the conventional bulk heterojunction PPD. Morphology studies reveal that the PC71BM partially penetrates the predeposited P3HT layer during the spin-coating process, resulting in an optimal three-phase morphology with one well-mixed interdiffusion P3HT/PC71BM phase in the middle of the bulk and two pure phases of P3HT and PC71BM at the two electrode sides. We show that the pure phases form high Schottk...
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Citations
A High-Performance Solution-Processed Organic Photodetector for Near-Infrared Sensing.
Jianfei Huang,Jaewon Lee,Joachim Vollbrecht,Viktor V. Brus,Alana L. Dixon,David Xi Cao,Ziyue Zhu,Zhi-Fang Du,Hengbin Wang,Kilwon Cho,Guillermo C. Bazan,Thuc-Quyen Nguyen +11 more
TL;DR: Organic photodetectors based on a novel ultranarrow-bandgap nonfullerene acceptor, CO1-4Cl, are presented, showcasing a remarkable responsivity over 0.5 A W-1 in the NIR spectral region (920-960 nm), which is the highest among organic photodiodes.
372
Organic Photodetectors and their Application in Large Area and Flexible Image Sensors: The Role of Dark Current
TL;DR: In this article, a quantitative analysis of the intrinsic dark current processes shows that charge injection from the electrodes is the dominant contribution to the dark current density in OPDs, which is typically addressed by fine-tuning the active layer energetics and stratification or using charge blocking layers.
326
Narrowband organic photodetectors – towards miniaturized, spectroscopic sensing
01 Jan 2022
TL;DR: In this paper , the recent progress of narrowband organic photodetectors is systematically summarized covering all aspects from narrow-photo-absorbing materials to device architecture engineering, and the recent challenges for narrowband OPDs, like achieving high responsivity, low dark current, high response speed, and good dynamic range are carefully addressed.
124
Solution-processed broadband polymer photodetectors with a spectral response of up to 2.5 μm by a low bandgap donor–acceptor conjugated copolymer
TL;DR: In this paper, a solution-processed polymer photodetectors with a spectral response ranging from 350 nm to 2500 nm are reported, where the low bandgap donor-acceptor (D-A) conjugated copolymer contributes to the IR photo-response.
103
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