Highly sensitive polymer photodetectors with a wide spectral response range

doi:10.1088/1674-1056/26/1/018201

Abstract A series of highly sensitive polymer photodetectors (PPDs) was fabricated with P3HT_100-x:PBDT-TS1_x:PC₇₁BM₁ as the active layers, where x represents the PBDT-TS1 doping weight ratio in donors. The response range of PPDs can cover from the UV to near-infrared regions by adjusting the PBDT-TS1 doping weight ratio. The best external quantum efficiency (EQE) values of ternary PPDs with P3HT:PBDT-TS1:PC₇₁BM (50:50:1 wt/wt/wt) as the active layers reach 830%, 720%, and 330% under 390-, 625-, and 760-nm light illumination and -10 V bias, respectively. The large EQE values indicate that the photodetectors utilise photomultiplication (PM). The working mechanism of PM-type PPDs can be attributed to interfacial trap-assisted hole tunnelling injection from the external circuit under light illumination. The calculated optical field and photogenerated electron volume density in the active layers can well explain the EQE spectral shape as a function of the PBDT-TS1 doping weight ratio in donors.

Keywords: conducting polymers photodetectors photomultiplication

Received: 05 August 2016
Revised: 31 October 2016
Accepted manuscript online:

PACS:	82.35.Cd	(Conducting polymers)
	85.60.Gz	(Photodetectors (including infrared and CCD detectors))
	85.60.Ha	(Photomultipliers; phototubes and photocathodes)

Fund: Project supported by the Fundamental Research Funds for the Central Universities of China (Grant No. 2014JBZ017) and the National Natural Science Foundation of China (Grant Nos. 61377029 and 61675017).

Corresponding Authors: Fujun Zhang
E-mail: fjzhang@bjtu.edu.cn

Cite this article:

Mile Gao(高米勒), Wenbin Wang(王文斌), Lingliang Li(李凌亮), Jianli Miao(苗建利), Fujun Zhang(张福俊) Highly sensitive polymer photodetectors with a wide spectral response range 2017 Chin. Phys. B 26 018201

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Highly sensitive polymer photodetectors with a wide spectral response range

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