研究目的
Investigating the performance of infrared phototransistors using a broadband absorbing organic bulk heterojunction layer for visible to shortwave infrared light detection.
研究成果
The phototransistors achieve high-performance, broadband spectral response through the effective combination of BHJ for photogeneration and IZO for charge transport. This design allows independent optimization of each layer, with the BHJ improved with camphor to increase trapped carrier lifetime and the IZO layer maintaining short carrier transit time. The devices show peak performance at low illumination power, with the applied gate bias in the depletion regime near the turn-on voltage, and at switching frequencies that allow sufficient time for electron re-circulation to maximize photoconductive gain.
研究不足
The study focuses on the performance of phototransistors under specific conditions (e.g., low light illumination, specific spectral range) and may not cover all potential applications or environmental conditions.
1：Experimental Design and Method Selection:
The study uses a bilayer transistor channel to decouple charge photogeneration and transport, enabling independent optimization of each process. The organic BHJ layer is improved with camphor to increase carrier lifetime, and an indium zinc oxide transport layer is used for rapid charge transport.
2：Sample Selection and Data Sources:
The BHJ layer includes a blend of a narrow bandgap IR absorbing polymer and PC71BM as the acceptor, with or without camphor as the high-permittivity additive.
3：List of Experimental Equipment and Materials:
Includes a heavily p-doped Si wafer with 300 nm thermal oxide, IZO ink, aluminum for contact electrodes, and a BHJ solution prepared with donor polymer and PC71BM in toluene with diiodooctane.
4：Experimental Procedures and Operational Workflow:
The IZO precursor solution was printed using inkjet, annealed, and then aluminum electrodes were deposited. The BHJ solution was spin-coated and vacuum dried. Devices were encapsulated with a glass slide bonded with epoxy.
5：Data Analysis Methods:
EQE measurements were performed with a monochromatic light source modulated at 10 Hz, and the device photocurrent was amplified and measured with a lock-in amplifier. Electrochemical impedance spectroscopy was performed over the frequency range of 100 Hz to 2 MHz.
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