Transient absorption spectrometer excited by pulse current
A technology of transient absorption and pulse current, which is applied in the field of optical measurement, can solve the problem that carrier dynamics information cannot be effectively measured, and achieve the effect of accurate transient absorption signal, wide application and accurate testing
Active Publication Date: 2021-04-20
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology
[0005] Based on the above problems, the present disclosure provides a transient absorption spectrometer excited by a pulse current to alleviate the technical problems in the prior art that the dynamic information of carriers after electric excitation cannot be effectively measured
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[0029] The present disclosure provides a transient absorption spectrometer excited by a pulse current, which is different from the common pump-probe transient absorption spectrometer that uses light to excite samples. Detect light, collect carrier dynamics information in the sample to be tested after electrical excitation, and establish a pulse current pumping-photodetection transient absorption spectrometer, which is suitable for studying LEDs, electrolasers, photodetectors, and solar cells. Parameters such as mobility and defect concentration. It can test current pulse signal excitation carrier relaxation information, can measure exciton relaxation information, and can also test injection single electron or single hole carrier relaxation information. It can be used to measure the absorption spectrum and carrier dynamics information corresponding to the generation and decay of transient components of the sample to be tested. The analytical device can detect current excitatio...
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The invention provides a transient absorption spectrometer excited by pulse current. The transient absorption spectrometer comprises: a central control unit; a pulse generator used for generating a current pulse signal under the action of a first trigger signal sent by the central control unit and generating an electroluminescent signal after applying the current pulse signal to a to-be-detected sample; a laser device for emitting a pulsed light signal under the action of a second trigger signal emitted by the central control unit; a beam splitter arranged in the light emitting direction of the laser device and used for splitting the pulsed light signal into a detection light signal and a reference light signal, wherein the detection light signal irradiates the to-be-detected sample to generate a detection sample light signal; a data acquisition unit used for acquiring an electro-optical signal, a detection sample optical signal and a reference optical signal under the action of a third trigger signal and a fourth trigger signal sent by the central control unit, and processing the signals into electric signal data for reflecting the absorption intensity of the optical signals with different wavelengths of the sample at a single moment; and a data processing and imaging unit used for processing the electric signal data to obtain a transient absorption signal of the to-be-detected sample and imaging the transient absorption signal.
Description
technical field [0001] The present disclosure relates to the technical field of optical measurement, in particular to a transient absorption spectrometer excited by pulse current. Background technique [0002] The conventional transient absorption technique is a time-resolved pump-probe technique that is widely used. This technology uses a beam of pulsed laser to excite the sample to be tested to change its physical or chemical properties, thereby changing the absorption coefficient of the sample, and another beam of detection light is used to detect this change, which can be monochromatic light Also available as white light. By changing the delay between the pump light and the probe light, the transient absorption spectrum of the sample at different moments after being excited by light can be obtained, and the corresponding kinetic information can be obtained by analyzing the generation and attenuation of the transient signal. The advantage of transient absorption spectro...
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IPC IPC(8): G01N21/01G01N21/39
CPCG01N21/1717G01N2021/1721G01N21/66G01N21/39G01N21/01G01N2201/06113
Inventor 李波唐贝贝樊逢佳杜江峰
Owner UNIV OF SCI & TECH OF CHINA