Trap-Assisted Photomultiplication Polymer Photodetectors Obtaining an External Quantum Efficiency of 37 500%

Lingliang Li; Fujun Zhang; Wenbin Wang; Qiaoshi An; Jian Wang; Qianqian Sun; Miao Zhang

doi:10.1021/acsami.5b00041

Trap-Assisted Photomultiplication Polymer Photodetectors Obtaining an External Quantum Efficiency of 37 500%

Lingliang Li, Fujun Zhang^*, Wenbin Wang, Qiaoshi An, Jian Wang, Qianqian Sun, Miao Zhang

^*Corresponding author for this work

Beijing Jiaotong University

Research output: Contribution to journal › Article › peer-review

139 Citations (Scopus)

Abstract

A smart strategy is reported to obtain photomultiplication (PM) type polymer photodetectors (PPDs) based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C₆₁-butyric acid methyl ester (PC₆₁BM) which are commonly used in polymer solar cells. The PPDs with 1 wt % PC₆₁BM exhibit a champion EQE of 37,500% under 625 nm illumination with an intensity of 8.87 μW cm^-2 at -19 V bias. The PM phenomenon of PPDs with rather low PC₆₁BM doping ratios should be attributed to the enhanced hole tunneling injection assisted by trapped electrons in PC₆₁BM near the Al cathode, which can be completely demonstrated from (i) turning distribution of electron traps by changing P3HT:PC₆₁BM doping weight ratios from 200:1 to 1:1; (ii) adjusting interfacial barrier width by inserting LiF layer between the active layer and the Al cathode. (Graph Presented).

Original language	English
Pages (from-to)	5890-5897
Number of pages	8
Journal	ACS applied materials & interfaces
Volume	7
Issue number	10
DOIs	https://doi.org/10.1021/acsami.5b00041
Publication status	Published - 18 Mar 2015
Externally published	Yes

Keywords

band bending
organic photodetector
photomultiplication
trap
tunneling injection

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10.1021/acsami.5b00041

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@article{29e820d5830a4c988346185c6c190f24,

title = "Trap-Assisted Photomultiplication Polymer Photodetectors Obtaining an External Quantum Efficiency of 37 500%",

abstract = "A smart strategy is reported to obtain photomultiplication (PM) type polymer photodetectors (PPDs) based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) which are commonly used in polymer solar cells. The PPDs with 1 wt % PC61BM exhibit a champion EQE of 37,500% under 625 nm illumination with an intensity of 8.87 μW cm-2 at -19 V bias. The PM phenomenon of PPDs with rather low PC61BM doping ratios should be attributed to the enhanced hole tunneling injection assisted by trapped electrons in PC61BM near the Al cathode, which can be completely demonstrated from (i) turning distribution of electron traps by changing P3HT:PC61BM doping weight ratios from 200:1 to 1:1; (ii) adjusting interfacial barrier width by inserting LiF layer between the active layer and the Al cathode. (Graph Presented).",

keywords = "band bending, organic photodetector, photomultiplication, trap, tunneling injection",

author = "Lingliang Li and Fujun Zhang and Wenbin Wang and Qiaoshi An and Jian Wang and Qianqian Sun and Miao Zhang",

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

month = mar,

day = "18",

doi = "10.1021/acsami.5b00041",

language = "English",

volume = "7",

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journal = "ACS applied materials & interfaces",

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publisher = "American Chemical Society",

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T1 - Trap-Assisted Photomultiplication Polymer Photodetectors Obtaining an External Quantum Efficiency of 37 500%

AU - Li, Lingliang

AU - Zhang, Fujun

AU - Wang, Wenbin

AU - An, Qiaoshi

AU - Wang, Jian

AU - Sun, Qianqian

AU - Zhang, Miao

PY - 2015/3/18

Y1 - 2015/3/18

N2 - A smart strategy is reported to obtain photomultiplication (PM) type polymer photodetectors (PPDs) based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) which are commonly used in polymer solar cells. The PPDs with 1 wt % PC61BM exhibit a champion EQE of 37,500% under 625 nm illumination with an intensity of 8.87 μW cm-2 at -19 V bias. The PM phenomenon of PPDs with rather low PC61BM doping ratios should be attributed to the enhanced hole tunneling injection assisted by trapped electrons in PC61BM near the Al cathode, which can be completely demonstrated from (i) turning distribution of electron traps by changing P3HT:PC61BM doping weight ratios from 200:1 to 1:1; (ii) adjusting interfacial barrier width by inserting LiF layer between the active layer and the Al cathode. (Graph Presented).

AB - A smart strategy is reported to obtain photomultiplication (PM) type polymer photodetectors (PPDs) based on poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) which are commonly used in polymer solar cells. The PPDs with 1 wt % PC61BM exhibit a champion EQE of 37,500% under 625 nm illumination with an intensity of 8.87 μW cm-2 at -19 V bias. The PM phenomenon of PPDs with rather low PC61BM doping ratios should be attributed to the enhanced hole tunneling injection assisted by trapped electrons in PC61BM near the Al cathode, which can be completely demonstrated from (i) turning distribution of electron traps by changing P3HT:PC61BM doping weight ratios from 200:1 to 1:1; (ii) adjusting interfacial barrier width by inserting LiF layer between the active layer and the Al cathode. (Graph Presented).

KW - band bending

KW - organic photodetector

KW - photomultiplication

KW - trap

KW - tunneling injection

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U2 - 10.1021/acsami.5b00041

DO - 10.1021/acsami.5b00041

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JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

IS - 10

ER -

Trap-Assisted Photomultiplication Polymer Photodetectors Obtaining an External Quantum Efficiency of 37 500%

Abstract

Keywords

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