Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 40, Pages 45092-45100Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c13833
Keywords
organic photodetector; non-fullerene acceptor; cross-linkable; electron blocking layer; detectivity
Funding
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- National Natural Science Foundation of China [51933003]
- Program for Science and Technology Development of Dongguan [2019622163009]
- Dongguan Innovative Research Team Program [2018607201002]
- Science and Technology Program of Guangdong [2020A1515011028]
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The anode interlayer plays a critical role in the performance of organic photodetectors, which requires sufficient electron-blocking ability to simultaneously attain a high photocurrent and low dark current. Here, we developed two cross-linkable polymers, which can be deposited on the top of the widely used poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and form a robust layer that can effectively suppress the electron injection from the anode under reverse bias. The optimized device with the resulting cross-linkable XP2 exhibited the lowest dark current density of 5.81 x 10(9) A cm(2) at -0.1 V, which is about 2 orders of magnitude lower than the control devices. A remarkable responsivity of 0.5 A W-1 and a detectivity of >1 x 10(13) Jones at a near-infrared wavelength of 800 nm were achieved. Of particular importance is that the resulting device exhibited a linear dynamic range of >135 dB associated with a high working frequency that is shorter than typical commercial digital imagers. The planar heterojunction devices demonstrate that the dark current is closely correlated to the charge generation, which relied on the highest occupied molecular orbital energy levels of the developed cross-linked interlays. The MottSchottky analysis revealed that the optimized cross-linked interlayer increased the depletion width of the devices.
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