研究目的
Investigating the effects of PCPDTBT doping on the optical and electrical properties of organic photodetectors (OPDs) to realize response broadening.
研究成果
The addition of PCPDTBT to PTB7:PC61BM significantly broadens the response spectrum of OPDs and enhances their performance through increased light absorption, higher exciton dissociation probability, and optimized carrier transport. The optimal mass ratio of PTB7:PCPDTBT:PC61BM was found to be 8.5:1.5:15, achieving high detectivity and balanced response across a wide spectral range.
研究不足
The study is limited by the potential change in the transport channel of the carrier due to the addition of excess PCPDTBT, which could affect the device performance. Additionally, the response spectral range and working voltage of existing ternary OPDs present challenges that need to be addressed.
1：Experimental Design and Method Selection:
The study involved the preparation of OPDs with a ternary bulk heterojunction structure using PTB7, PCPDTBT, and PC61BM. The effects of different mass ratios of PCPDTBT on the photoelectric properties of OPDs were analyzed.
2：Sample Selection and Data Sources:
The active layers were prepared with varying mass ratios of PTB7:PCPDTBT:PC61BM dissolved in chlorobenzene. The devices were characterized under illumination and dark conditions.
3：List of Experimental Equipment and Materials:
Instruments used include a Keithley 2636 semiconductor test system, LS-45/55 fluorescence spectrometer, Shimadzu UV-3600 UV–Vis–NIR spectrometer, VB-400 ellipsometer, Nano Scope NS3A atomic force microscope (AFM), and JEOL JEM-3010 transmission electron microscope.
4：Experimental Procedures and Operational Workflow:
The OPDs were prepared with an ITO/PEDOT:PSS/PTB7:PCPDTBT:PC61BM/Al structure. The active layer was spin-coated and annealed, followed by the evaporation of an Al electrode.
5：Data Analysis Methods:
The responsivity (R), detectivity (D*), and external quantum efficiency (EQE) of the OPDs were calculated using specific formulas. The hole mobility (μh) was determined by fitting the dark current to the space charge limited current model (SCLC).
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Shimadzu UV-3600 UV–Vis–NIR spectrometer
UV-3600
Shimadzu
Measuring the absorption spectra of the films.
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JEOL JEM-3010 transmission electron microscope
JEM-3010
JEOL
Obtaining transmission electron microscopy (TEM) images of blend films.
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Keithley 2400
2400
Keithley
Used in transient characteristics testing.
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Keithley 2636 semiconductor test system
2636
Keithley
Measuring the current density-voltage (J-V) curve of the device under illumination and dark light conditions.
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LS-45/55 fluorescence spectrometer
LS-45/55
Measuring the photoluminescence (PL) spectra of the films.
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VB-400 ellipsometer
VB-400
Measuring the film thickness.
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Nano Scope NS3A atomic force microscope
NS3A
Nano Scope
Characterizing the microscopic morphology of the film.
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Oriel QEPVSI-B Quantum Efficiency Solution
QEPVSI-B
Oriel
Measuring the EQE spectra of devices.
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