Abstract:
:We report a dual-mode organic photodetector (OPD) that has a trilayer visible light absorber/optical spacer/near-infrared (NIR) light absorber configuration. In the presence of NIR light, photocurrent is produced in the NIR light-absorbing layer due to the trap-assisted charge injection at the organic/cathode interface at a reverse bias. In the presence of visible light, photocurrent is produced in the visible light-absorbing layer, enabled by the trap-assisted charge injection at the anode/organic interface at a forward bias. A high responsivity of >10 A/W is obtained in both short and long wavelengths. The dual-mode OPD exhibits an NIR light response operated at a reverse bias and a visible light response operated at a forward bias, with a high specific detectivity of ~1013 Jones in both NIR and visible light ranges. A bias-switchable spectral response OPD offers an attractive option for applications in environmental pollution detection, bioimaging process, wellness, and security monitoring in two distinct bands.
journal_name
Sci Advjournal_title
Science advancesauthors
Lan Z,Lei Y,Chan WKE,Chen S,Luo D,Zhu Fdoi
10.1126/sciadv.aaw8065subject
Has Abstractpub_date
2020-01-31 00:00:00pages
eaaw8065issue
5issn
2375-2548pii
aaw8065journal_volume
6pub_type
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