Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 15, Pages 14208-14214Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b02092
Keywords
all-polymer photodetectors; thick photoactive layer; naphthol[1,2-c:5,6-c ']bis(([1,2,5]thiadiazole); high detectivity; noise power density
Funding
- National Natural Science Foundation of China [21822505, 21634004, 51521002, 21574103]
- Program for Science and Technology Development of Dongguan [2019622163009]
- China Postdoctoral Science Foundation [2018M643079, 2018M643078]
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To achieve high detectivity in all-polymer photodetectors (all-PPDs), a thick-film photoactive layer is favored because it can effectively suppress the dark current density. However, if the photoactive layer of the film is too thick, it leads to reduced responsivity owing to increased recombination loss. We developed high-performance all-PPDs by using a narrowband-gap p-type polymer NT40 and an n-type polymer poly{[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'bithiophene)} as the photoactive layer. The high charge carrier mobility of both copolymers enabled a photoactive layer thickness of 300 nm, leading to an ultralow dark current density of 4.85 x 10(-10) A cm-(2), a detectivity of 2.61 x 10(13) Jones, a high responsivity of 0.33 A W-1 at 720 nm, and a bias of -0.1 V. The detectivity achieved >1013 Jones in a wide range from 360 to 850 nm, which is among the highest values so far reported for all-PPDs without extra gains. More importantly, the resultant all-PPDs exhibited a high working frequency over 10 kHz associated with a large linear dynamic range. These findings demonstrate great potential for practical applications of the all-PPDs developed in this work.
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