WO2015037596A1 - 酸化物半導体薄膜の評価装置 - Google Patents
酸化物半導体薄膜の評価装置 Download PDFInfo
- Publication number
- WO2015037596A1 WO2015037596A1 PCT/JP2014/073865 JP2014073865W WO2015037596A1 WO 2015037596 A1 WO2015037596 A1 WO 2015037596A1 JP 2014073865 W JP2014073865 W JP 2014073865W WO 2015037596 A1 WO2015037596 A1 WO 2015037596A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- excitation light
- oxide semiconductor
- thin film
- semiconductor thin
- sample
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6489—Photoluminescence of semiconductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/069—Supply of sources
- G01N2201/0696—Pulsed
- G01N2201/0697—Pulsed lasers
Definitions
- the present invention relates to an evaluation apparatus for an oxide for a semiconductor layer (hereinafter referred to as an “oxide semiconductor thin film”) of a thin film transistor (TFT: Thin Film Transistor) used in a display device such as a liquid crystal display or an organic EL display.
- an oxide semiconductor thin film a semiconductor layer
- TFT Thin Film Transistor
- the present invention relates to a non-contact evaluation apparatus for mobility and stress resistance of an oxide semiconductor thin film.
- An amorphous oxide semiconductor thin film has higher carrier mobility than a general-purpose amorphous silicon (hereinafter referred to as “a-Si”), a large optical band gap, and can be formed at a low temperature. Therefore, it is expected to be applied to next-generation displays that require large size, high resolution, and high-speed driving, and resin substrates with low heat resistance.
- a-Si general-purpose amorphous silicon
- oxide semiconductor thin films in particular, including at least one of indium (In), gallium (Ga), zinc (Zn), tin (Sn), etc.
- oxide semiconductor thin films including at least one of indium (In), gallium (Ga), zinc (Zn), tin (Sn), etc.
- An amorphous oxide semiconductor thin film such as Sn—O has a very high carrier mobility and is preferably used for a TFT.
- the mobility of the oxide semiconductor varies due to lattice defects generated in the film formation process and impurities such as hydrogen in the film, which may adversely affect the TFT characteristics.
- the oxide semiconductor thin film has a problem that its electrical characteristics are likely to fluctuate and its reliability is low as compared with the case of using a-Si.
- a positive voltage continues to be applied to the gate electrode of the driving TFT while the organic EL element emits light, but the charge is trapped at the interface between the gate insulating film and the semiconductor layer due to the voltage application.
- the threshold voltage hereinafter referred to as “Vth” changes and the switching characteristics change.
- the mobility of the deposited oxide semiconductor thin film and the threshold voltage shift amount (hereinafter referred to as “ ⁇ Vth”) are accurately measured and estimated, and the oxide semiconductor thin film From the viewpoint of improving productivity, it is important to evaluate the characteristics of the film and feed back the results to adjust the manufacturing conditions and perform quality control of the film quality.
- a gate insulating film or a passivation insulating film is usually formed on an oxide semiconductor thin film and electrodes are attached, and then characteristics such as mobility and threshold are measured. Yes.
- the contact-type characteristic evaluation method that requires electrode attachment requires time and cost for electrode attachment.
- a new defect may be generated in the oxide semiconductor thin film by attaching the electrode. From the viewpoint of improving the production yield, a non-contact type characteristic evaluation method that does not require electrode attachment is required.
- the present applicant uses an evaluation method by a microwave photoconductive decay method and the evaluation method as shown in Patent Document 1.
- An evaluation device is disclosed. This technique irradiates a sample on which an oxide semiconductor thin film is formed with a laser, calculates a lifetime value by measuring a change in the reflectance of the microwave that changes in accordance with excess carriers excited by the laser irradiation. The mobility of oxide semiconductor thin films is evaluated.
- Patent Document 1 does not require electrode attachment to a semiconductor thin film, and can measure the mobility of a semiconductor thin film with high accuracy in a short time.
- Patent Document 1 cannot evaluate stress tolerance. For this reason, stress tolerance has been evaluated by an NBTI (Negative Bias Temperature Instability) test that still requires electrode attachment.
- NBTI Negative Bias Temperature Instability
- the present invention has been made in view of the above circumstances, and an object of the present invention is to measure mobility and stress resistance as electrical characteristics of an oxide semiconductor thin film in a non-contact type, accurately, and simply with the same apparatus.
- An object of the present invention is to provide an evaluation apparatus that can perform evaluation including prediction and estimation of electrical characteristics.
- the apparatus for evaluating an oxide semiconductor thin film according to the present invention provides a measurement site of a sample on which the oxide semiconductor thin film is formed by irradiating a first excitation light in the oxide semiconductor thin film From the first excitation light irradiating means for generating electron-hole pairs, the electromagnetic wave irradiating means for irradiating the measurement site of the sample with an electromagnetic wave, and the sample of the electromagnetic wave changing by the irradiation of the first excitation light.
- Reflected electromagnetic wave intensity detecting means for detecting the reflected electromagnetic wave intensity
- second excitation light irradiating means for generating photoluminescence light from the oxide semiconductor thin film by irradiating the sample with second excitation light
- the photoluminescence light Emission intensity measurement means for measuring emission intensity, detection data of the reflected electromagnetic wave intensity detection means, and mobility of the sample based on measurement data of the emission intensity measurement means
- stress And evaluating means for evaluating sex, provided with a, wherein a first excitation light illumination means second excitation light illumination means includes a summary to be identical or different excitation light emitting means.
- the first excitation light irradiation means preferably includes a light source that outputs energy equal to or higher than a band gap of the oxide semiconductor thin film
- the second excitation light irradiation means includes the oxide It is also a preferable embodiment to have a light source that outputs energy corresponding to a defect level existing in the band gap of the semiconductor thin film.
- the second excitation light irradiation unit preferably includes a light source that outputs energy for exciting only photoluminescence light having a specific wavelength from the oxide semiconductor thin film.
- an optical path switching unit that changes an optical path of the first excitation light and / or the second excitation light is provided on an optical path of the first excitation light and the second excitation light.
- the optical path switching means is preferably installed so that the first excitation light and the second excitation light irradiate the same or different measurement locations of the sample.
- a waveguide for guiding the first excitation light and the electromagnetic wave to the measurement site of the sample is provided, and the side surface of the waveguide near the sample-side opening is provided with the first excitation light and the electromagnetic wave. It is also a preferred embodiment that an inlet for double excitation light is provided.
- the present invention it is possible to provide an apparatus for predicting, estimating and evaluating the mobility and stress resistance of an oxide semiconductor thin film accurately and simply in a non-contact manner.
- mobility and stress resistance can be evaluated with the same device.
- the evaluation apparatus installation cost is low and the installation space for the evaluation apparatus can be reduced.
- the electrical characteristics of an oxide semiconductor thin film can be performed in-line in a short time and in a non-contact manner in a production line such as a liquid crystal display device, thereby improving productivity such as improvement in yield.
- the quality of the oxide semiconductor can be appropriately controlled.
- FIG. 1 is a schematic explanatory view showing an example of the evaluation apparatus of the present invention.
- FIG. 2 is a schematic explanatory view showing another example of the evaluation apparatus of the present invention.
- FIG. 3 is a schematic explanatory view showing another example of the evaluation apparatus of the present invention.
- FIG. 4 is a schematic explanatory diagram regarding the collection of photoluminescence light using an ellipsoidal mirror.
- FIG. 5 is a schematic explanatory diagram of a waveguide provided with a second excitation light entrance near the waveguide tip opening.
- the present applicant has previously proposed an evaluation method using a microwave photoconductive decay method as a technique for evaluating the mobility of an oxide semiconductor thin film.
- the evaluation method by the microwave photoconductive decay method is a non-contact type measurement that does not require electrode attachment and can be measured in a short time. Therefore, in the present invention, the mobility should be evaluated by a known microwave photoconductive decay method. It was.
- FIG. 1 is a schematic explanatory view showing an example of an evaluation apparatus used for evaluating the mobility and stress resistance of an oxide semiconductor thin film.
- the evaluation apparatus shown in FIG. 1 includes a first excitation light irradiation means 1 such as a pulsed laser that irradiates a measurement site of a sample 20 composed of an oxide semiconductor thin film and a substrate with a first excitation light, a microwave (hereinafter referred to as “electromagnetic wave”).
- the electromagnetic wave irradiating means 3 such as a microwave oscillator for irradiating the electromagnetic wave
- the reflected electromagnetic wave intensity detecting means such as a mixer for detecting the intensity of the reflected electromagnetic wave from the sample 20 of the microwave changing by the irradiation of the first excitation light.
- the mobility can be measured by this configuration.
- the second excitation light irradiation means 2 such as a pulse laser or a CW laser that irradiates the second excitation light to the measurement site that is the same as or different from the measurement site of the electromagnetic wave intensity of the sample 20, and the photo generated by the irradiation of the second excitation light.
- Emission intensity measuring means 19 for measuring the emission intensity of the luminescence light is provided, and stress resistance can be measured by this configuration.
- An evaluation means 9 is provided for evaluating the mobility and stress resistance of the sample based on the detection data of the reflected electromagnetic wave intensity and the measurement data of the emission intensity.
- the apparatus configuration for evaluating the mobility includes the first excitation light irradiation means 1, the electromagnetic wave irradiation means 3, the reflected electromagnetic wave intensity detection means 7, and the evaluation means 9 in the configuration shown in FIG.
- Preferred configurations include a directional coupler 4, a phase adjuster 4a, a magic T (5), a first waveguide-6a that is a signal waveguide, a second waveguide-6b that is a reference waveguide, A signal processing device 8, a stage controller 10, an XY stage 11, a sample stage (not shown), a substrate holder (not shown), an optical path changing means 12 such as a mirror, and a condensing means 16 such as a condenser lens.
- a directional coupler 4 includes a directional coupler 4, a phase adjuster 4a, a magic T (5), a first waveguide-6a that is a signal waveguide, a second waveguide-6b that is a reference waveguide, A signal processing device 8, a stage controller 10, an XY stage 11,
- the sample 20 is composed of a substrate made of glass or the like and an oxide semiconductor thin film formed on the excitation light irradiation side of the surface thereof.
- the kind of the oxide semiconductor is not particularly limited, and for example, an amorphous oxide semiconductor made of a combination of at least one selected from the group consisting of In, Ga, Zn, and Sn is used.
- the oxide semiconductor include In oxide, In—Sn oxide, In—Zn oxide, In—Sn—Zn oxide, In—Ga oxide, Zn—Ga oxide, and In—Ga—Zn oxide. Zn oxide and the like.
- the oxide semiconductor thin film may have a thickness of about several tens to 100 nm.
- a glass substrate for a liquid crystal display device having a thickness of about 0.7 mm and a size exceeding several tens of cm 2 to several m 2 called a first generation to a tenth generation. Can be used.
- the sample 20 has a portion A where the oxide semiconductor thin film is formed directly on the substrate and a metal film such as molybdenum is formed on the substrate, and the oxide semiconductor thin film is formed thereon.
- a portion B may be included, and a sample having such portions A and B is referred to as a sample 20a. Since the oxide semiconductor thin film is directly formed on the substrate in the portion A of the sample 20a, reflection of microwaves can be prevented and mobility can be measured with high sensitivity. In addition, since the portion B of the sample 20a can avoid generation of luminescence light from the substrate when the sample is irradiated with excitation light, the evaluation accuracy of stress resistance is further improved.
- the second excitation light for evaluating stress resistance at the same location as the measurement site of the first excitation light for evaluating mobility. Can be irradiated. It is preferable to irradiate the same place with the first and second excitation lights because the mobility and stress resistance at the same place can be evaluated.
- the first excitation light irradiation means 1 has a light source that outputs the first excitation light irradiated to the sample 20, and generates electron-hole pairs in the oxide semiconductor thin film by irradiation with the first excitation light. It is.
- the light emitting device has a light source that outputs excitation light having energy higher than that of the band cap of the oxide semiconductor thin film. It is preferable because energy can be efficiently generated by outputting energy higher than the band cap of the oxide semiconductor thin film and can be measured with high sensitivity.
- an ultraviolet laser may be used as the light source as the first excitation light irradiating means for outputting energy of the band gap or more.
- a semiconductor laser such as a pulse laser that emits YLF laser third harmonic, which is a pulsed ultraviolet light having a wavelength of 349 nm, a power of 1 ⁇ J / pulse, a pulse width of about 15 ns, and a beam diameter of about 1.5 mm, as excitation light.
- a semiconductor laser such as a pulse laser that emits YLF laser third harmonic, which is a pulsed ultraviolet light having a wavelength of 349 nm, a power of 1 ⁇ J / pulse, a pulse width of about 15 ns, and a beam diameter of about 1.5 mm, as excitation light.
- the first excitation light irradiation means 1 outputs a pulsed light as the first excitation light triggered by the input of a timing signal transmitted from the evaluation means 9 as indicated by a broken line in the figure.
- the timing signal is also transmitted to the signal processing device 8 at the same time.
- the first excitation light output from the first excitation light irradiating means 1 is reflected by an optical path changing means (hereinafter, represented by a mirror) 12 such as a mirror, and is condensed by a condensing means (hereinafter, a condenser lens).
- a condensing means hereinafter, a condenser lens
- a condenser lens which is condensed by 16 represented by a condensing lens, passes through a minute opening 6 c provided in the first waveguide 6 a, and is an opening at the end of the first waveguide 6 a that is close to the sample 20.
- the measurement site of the sample 20 for example, a spot having a diameter of about 5 to 10 ⁇ m is irradiated.
- the mirror 12 and the condensing lens 16 condense the first excitation light output from the first excitation light irradiation means 1 and guide it to the measurement site of the sample 20.
- excitation carriers are generated at the measurement site in the sample 20 which is a minute excitation light irradiation region.
- the electromagnetic wave irradiation means 3 is an electromagnetic wave irradiation means for outputting a microwave that is an electromagnetic wave to be irradiated to a measurement site in a portion including the excitation portion by the first excitation light of the sample 20.
- Examples of the electromagnetic wave irradiation means 3 include a microwave oscillator such as a Gunn diode having a frequency of 26 GHz.
- the directional coupler 4 branches the microwave output from the electromagnetic wave irradiation means 3 into two.
- One output wave after branching (hereinafter referred to as the first microwave Op1) is transmitted to the magic T (5) side, and the other output wave (hereinafter referred to as the second microwave Op2) is transmitted to the phase adjuster 4a and the reflected electromagnetic wave. It is transmitted to the LO input terminal of the intensity detecting means 7.
- this directional coupler 4 for example, a 10 dB coupler or the like is employed.
- the magic T (5) branches the first microwave Op1 into two branches, and also includes a difference signal Rt1 (hereinafter referred to as a reflected wave difference signal) and a sum signal of the reflected waves with respect to the sample 20 of each of the two branched first microwaves. Is output.
- a difference signal Rt1 hereinafter referred to as a reflected wave difference signal
- One of the first microwaves Op1 bifurcated by the magic T (5) (hereinafter referred to as the first main microwave Op11) is supplied to the sample 20 by the first waveguide 6a connected to the magic T (5). It is guided to the part including the excitation part, which is the measurement site, and is emitted from the opening 6d at the tip. Thereby, the measurement site
- the first waveguide 6a transmits the reflected wave of the first main microwave Op11 irradiated to the measurement site at the tip opening 6d. It also functions to capture and guide back to Magic T (5).
- the other one of the first microwaves Op1 bifurcated by the magic T (5) (hereinafter referred to as the first sub-microwave Op12) is sampled by the second waveguide 6b connected to the magic T (5).
- the light is guided to the vicinity of the measurement site 20a, that is, the portion not including the excitation portion by the excitation light, and is emitted from the opening 6e at the tip.
- the 1st submicrowave Op12 is irradiated to the vicinity of the measurement site
- the second waveguide 6b transmits the reflected wave of the first sub-microwave Op12 irradiated in the vicinity of the measurement site at its tip opening. It also functions to capture at 6e and guide it back to magic T (5).
- the path length through which the first waveguide 6a guides the microwave and the path length through which the second waveguide 6b guides the microwave are the same path length and are equal.
- a reflected wave difference signal Rt 1 as a signal is output by the magic T (5) and transmitted to the RF input terminal of the reflected electromagnetic wave intensity detecting means 7.
- the reflected electromagnetic wave intensity detecting means 7 outputs the detection signal Sg1 by mixing the second microwave Op2 and the reflected wave difference signal Rt1.
- the detection signal Sg1 is a signal that represents an example of the intensity of the reflected wave difference signal Rt1, for example, the intensity of the reflected wave of the first microwave Op1 irradiated on the sample 20, and is taken into the signal processing device 8.
- the intensity of the reflected wave difference signal Rt1 changes due to irradiation of excitation light to the sample 20 held at a predetermined position by a substrate holding unit (not shown).
- the reflected electromagnetic wave intensity detecting means 7 detects the intensity of the reflected wave difference signal Rt1, and the reflected electromagnetic wave intensity detecting means 7 is a mixer, a current input in accordance with the intensity of the microwave, A microwave detector or (detector) that outputs an electrical signal such as a voltage may be provided.
- the intensity of the reflected wave difference signal Rt1 detected by the reflected electromagnetic wave intensity detecting means 7 changes due to the irradiation of the first excitation light to the measurement site of the sample 20. Specifically, the intensity of the reflected wave difference signal Rt1 is attenuated after being temporarily increased by irradiation with (pulse light) corresponding to the first excitation light. Further, as the measurement site has more impurities, defects, and the like, the peak value of the intensity of the reflected wave difference signal Rt1 becomes smaller and the decay time (carrier life) becomes shorter.
- the peak value and the time from when the peak occurs until it attenuates to a predetermined level (attenuation time: lifetime value). This is an index value for evaluating the mobility of the sample 20.
- the signal processing device 8 is a device that detects the peak value Sp of the intensity change of the reflected wave difference signal Rt1 detected by the reflected electromagnetic wave intensity detection means 7 and transmits the detection result to the evaluation means 9. More specifically, the signal processing device 8 monitors the change of the reflected wave difference signal Rt1 for a predetermined time using the input of the timing signal from the evaluation unit 9 as a trigger, and the maximum value of the level of the reflected wave difference signal Rt1 obtained during that time Is detected as the peak value Sp of the intensity change of the reflected wave difference signal Rt1.
- the signal processing device 8 includes a delay circuit that performs a delay process on the reflected wave difference signal Rt1, detects the signal intensity sequentially at a predetermined sampling frequency with respect to the signal after the delay process, and changes in the detected value The peak value Sp of the intensity change of the reflected wave difference signal Rt1 is detected.
- a computer including a CPU, a storage unit, an input / output signal interface, and the like can be used, and the CPU executes various processes by executing predetermined programs.
- the evaluation unit 9 outputs a timing signal indicating the output timing of the excitation light to the first excitation light irradiation unit 1 and the signal processing device 8, and the reflected wave difference signal Rt 1 detected by the signal processing device 8.
- the peak value Sp is taken in and recorded in the storage unit provided in the evaluation means 9.
- the recorded reflected wave difference signal Rt1 corresponding to the detection data is used for evaluating the carrier mobility of the sample 20.
- stage controller 10 controls the positioning of the measurement site in the sample 20 by controlling the XY stage 11 in accordance with a command from the evaluation means 9.
- a sample stage (not shown) is provided above the XY stage 11.
- the sample stage is a plate-like member (hereinafter also referred to as “conductor member”) made of a metal such as aluminum, stainless steel or iron, or other conductors.
- a substrate holder (not shown) is provided on the upper side, and the sample 20 is placed on the substrate holder. Thereby, the sample stage is arranged on the lower side of the sample 20 on the opposite side to the side irradiated with the first microwaves Op11 and Op12.
- the substrate holding part is a solid dielectric fixed on the upper side of the sample stage.
- the substrate holding part is a solid dielectric inserted between a substrate as a sample and a sample table as a conductor member, and the material thereof is a dielectric having a relatively large refractive index such as glass or ceramic.
- photoexcited carriers are generated in the oxide semiconductor thin film by the first excitation light irradiated from the first excitation light irradiation means 1 and the electromagnetic wave irradiation means.
- the photoexcited carriers move in the microwave electric field irradiated from 3, and the movement state is affected by the presence of impurities, defects, etc. in the semiconductor.
- the reflected electromagnetic wave intensity detection means 7 detects the intensity of the reflected microwave from the sample, and the evaluation means 9 analyzes it to evaluate the mobility.
- the mobility can be evaluated by a value at which the intensity of the reflected microwave reaches a peak.
- the evaluation means 9 can also perform mapping measurement for determining crystallinity within a predetermined range by controlling the position of the stage including the XY table 11 and the like.
- the apparatus configuration for evaluating the stress tolerance is composed of the second excitation light irradiation means 2, the emission intensity measurement means 19, and the stress tolerance evaluation means 9 in the configuration shown in FIG. 1.
- the optical path changing means is movable, it is desirable because the optical path can be changed to a desired angle.
- subjected the same number as the apparatus structure of the said mobility may abbreviate
- the second excitation light irradiation means 2 has a light source that outputs the second excitation light irradiated to the sample 20, and generates photoluminescence light from the oxide semiconductor thin film by irradiation of the second excitation light.
- the light source preferably outputs energy corresponding to a defect level existing in the band gap of the oxide semiconductor thin film. By outputting energy corresponding to the defect level existing in the band gap of the oxide semiconductor thin film, the defect level related to light emission in the band gap can be observed. It is also preferable to have a light source that outputs energy for exciting only photoluminescence light having a specific wavelength of 1.6 to 1.9 eV, for example, from the oxide semiconductor thin film. This is because the emission intensity observed in the range of 1.6 to 1.9 eV and ⁇ Vth generally have a good correlation and are suitable for the evaluation of stress tolerance.
- an ultraviolet laser may be used as a light source.
- a semiconductor laser or the like that emits, as excitation light, a YLF laser third harmonic wave that is pulsed ultraviolet light having a wave of 349 nm, a pulse laser power of 1 ⁇ J / pulse, a pulse width of about 15 ns, and a beam diameter of about 1.5 mm Is preferably used.
- a He—Cd laser, an argon ion laser, or the like can be used as a laser light source capable of irradiating continuous light.
- the pulse light that is the second excitation light is triggered by the input of the timing signal indicated by the broken line in the figure transmitted from the evaluation means 9. Output.
- an ON signal such as TTL high is transmitted from the evaluation means 9 and the laser is output for a required time, for example, 100 mS for several seconds.
- the second excitation light irradiated from the second excitation light irradiation means 2 is irradiated to the sample 20 through the same optical path as the first excitation light. It is preferable that a condensing lens 16 is provided in the optical path, whereby the emitted luminescence light can be collected efficiently.
- the second excitation light output from the second excitation light irradiation means 2 is sequentially reflected by the mirrors 13, 14, and 12 and is condensed by the condenser lens 16, and is reflected on the first waveguide 6 a.
- the measurement portion of the sample 20 that is the same as the first excitation light is irradiated through the opening 6d at the end of the first waveguide 6a that passes through the provided minute opening 6c and close to the sample 20.
- photoluminescence light is excited at the measurement site which is a minute excitation light irradiation region in the sample 20.
- the photoluminescence light emitted from the measurement site of the sample 20 by the irradiation of the second excitation light is captured by the tip opening of the light guide path 18 and guided to the emission intensity measuring means 19.
- any light guide path can be used as long as it can guide the condensed photoluminescence light to the emission intensity measuring means 19 with low loss, and examples thereof include an optical fiber.
- the photoluminescence light guided to the emission intensity measuring means 19 is wavelength-resolved, and the emission intensity of each spectrum is recorded.
- the emission intensity measuring means 19 has a function of measuring the entire spectrum over the visible light region using a spectroscope, for example, and extracting the peak intensity observed in the range of 1.6 to 1.9 eV from the spectrum. It is preferable to have.
- the emission intensity measuring means 19 includes a spectroscope, a light detection means such as a charge coupled device (CCD), a photomultiplier tube, a light receiving element, and light of only 1.6 to 1.9 eV. It is also possible to use in combination with a filter that selectively transmits.
- the emission intensity measuring means 19 preferably includes a trigger for performing measurement in accordance with the irradiation time of the excitation light. It is possible to perform measurement with high sensitivity by measuring the intensity of the light emission intensity measuring means 19 only during the time when the laser is irradiated by the trigger signal transmitted from the evaluation means 9 to the laser.
- the evaluation means 9 captures the spectrally separated spectrum as measurement data, analyzes the waveform, and calculates the emission intensity ratio at the set energy.
- the evaluation means 9 outputs a timing signal indicating the output timing of the excitation light to the second excitation light irradiation means 2 and also stores the intensity value of the spectrum output by the emission intensity measurement means 19 in the evaluation means.
- the peak intensity is calculated from a broad peak existing in the range of 1.6 to 1.9 eV. Stress tolerance can be evaluated using the obtained data.
- the waveguide that guides the second excitation light to the measurement location of the sample 20 like the first excitation light.
- an optical path change means suitably so that it may irradiate through the opening part 6d by the side of the sample 20 from the micro opening part 6c of the pipe
- a second excitation light entrance 21 made of a transparent member such as glass may be provided on the side surface near the opening 6d on the sample 20 side of the first waveguide 6a.
- the second excitation light can be irradiated to the measurement site of the first excitation light.
- the second excitation light entrance 21 is provided with a filter 24 for preventing microwave leakage, which is a filter that transmits excitation light and does not transmit microwaves, and prevents leakage of microwaves. It is also desirable to coat the outside of the filter with a translucent member 23 having a property of transmitting excitation light such as glass.
- the photoluminescence light is generated in the oxide semiconductor thin film by the second excitation light irradiated from the second excitation light irradiation means 2, and this photoluminescence
- the stress tolerance can be evaluated.
- FIG. 2 and FIG. 3 show examples using the excitation light irradiation means 1a such as a pulse laser having the functions of the first excitation light irradiation means and the second excitation light irradiation means.
- the first excitation light for measurement and the second excitation light for evaluating stress resistance can be irradiated.
- the excitation light irradiation unit 1a includes an output adjustment unit so as to perform energy irradiation according to each excitation light.
- the optical paths of the first excitation light and the second excitation light may be the same, or the optical path switching means 15 is provided.
- the optical path of the first excitation light and / or the second excitation light may be changed to irradiate different measurement sites on the sample 20a.
- the first excitation light emitted from the excitation light irradiating means 1a changes its optical path by the mirror 12, passes through the minute opening 6c of the first waveguide 6a, and passes through the opening 6d at the measurement site of the sample 20a.
- the part A is irradiated.
- the second excitation light output from the excitation light irradiation means 1a changes the optical path by the optical path switching means 15, and is irradiated to the portion B which is a measurement site of the sample 20a different from the first excitation light.
- the first excitation light emitted from the excitation light irradiation means 1a is irradiated to the measurement site of the sample 20 by changing the optical path by the mirror 14, and the second excitation light also passes through the same optical path as the first excitation light.
- the same measurement site of the sample 20 is irradiated.
- an optical path switching means and an optical path changing means such as a mirror can be installed as appropriate, and the first excitation light and the second excitation light can be irradiated to arbitrary places.
- the optical path switching means 15 shown in FIG. 2 has a movable part and an optical path changing means such as a mirror, and is moved by an electric signal from the evaluation means 9 to change the optical path or block the optical path.
- the optical path switching means 15 is fixed at a position that does not block the optical path when the first excitation light is irradiated, and the optical path switching means 15 is changed so as to change the optical path of the second excitation light to a desired angle when the second excitation light is irradiated. Can be moved.
- the movable power of the optical path switching means 15 is not particularly limited, and known driving means such as a motor and pressurized air can be employed.
- the mobility and stress resistance of oxide semiconductor thin films of various compositions and concentrations can be evaluated easily in a short time and at low cost in the material development stage of the oxide semiconductor thin film. It becomes possible to do. Further, when the apparatus of the present invention is used, evaluation can be performed in a non-contact manner, so that productivity such as improvement in yield can be improved, and quality control of the oxide semiconductor can be appropriately performed.
- First excitation light irradiation means (pulse laser) 1a Excitation light irradiation means (pulse laser) 2 Second excitation light irradiation means (pulse laser or CW laser) 3 Electromagnetic wave irradiation means (microwave oscillator) 4 Directional coupler 4a Phase adjuster 5 Magic T 6a First waveguide (signal waveguide) 6b Second waveguide (reference waveguide) 6c Micro aperture (first waveguide) 6d opening (first waveguide) 6e Opening (second waveguide) 7 Reflected electromagnetic wave intensity detection means (mixer) 8 Signal processing device 9 Evaluation means 10 Stage controller 11 XY stage 12 Optical path changing means (mirror) 13 Optical path changing means (mirror) 14 Optical path changing means (mirror) 15 Optical path switching means 16 Condensing means (condensing lens) 17 Ellipsoidal mirror 18 Light guiding path 19 Emission intensity measuring means 20 Sample 20a Sample 21 Second excitation light entrance (glass) 22 Photoluminescence Light 23
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Electromagnetism (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Testing Or Measuring Of Semiconductors Or The Like (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
また前記第2励起光照射手段は、前記酸化物半導体薄膜から特定の波長のフォトルミネッセンス光のみを励起させるエネルギーを出力する光源を有することも好ましい。
1a 励起光照射手段(パルスレーザー)
2 第2励起光照射手段(パルスレーザーまたはCWレーザー)
3 電磁波照射手段(マイクロ波発振器)
4 方向性結合器
4a 位相調整器
5 マジックT
6a 第1導波管(信号用導波管)
6b 第2導波管(参照用導波管)
6c 微小開口(第1導波管)
6d 開口部(第1導波管)
6e 開口部(第2導波管)
7 反射電磁波強度検出手段(ミキサー)
8 信号処理装置
9 評価手段
10 ステージコントローラ
11 X-Yステージ
12 光路変更手段(ミラー)
13 光路変更手段(ミラー)
14 光路変更手段(ミラー)
15 光路切り替え手段
16 集光手段(集光レンズ)
17 楕円面ミラー
18 光誘導路
19 発光強度測定手段
20 試料
20a 試料
21 第2励起光導入口(ガラス)
22 フォトルミネッセンス光
23 透光部材
24 マイクロ波漏洩防止用フィルター
25 第2励起光
26 第1励起光
27 マイクロ波
28 測定部位
Claims (9)
- 酸化物半導体薄膜が形成された試料の測定部位に対して、第1励起光を照射して前記酸化物半導体薄膜中に電子-正孔対を生成する第1励起光照射手段と、
前記試料の測定部位に対して、電磁波を照射する電磁波照射手段と、
前記第1励起光の照射により変化する前記電磁波の前記試料からの反射電磁波強度を検出する反射電磁波強度検出手段と、
前記試料に第2励起光を照射して前記酸化物半導体薄膜からフォトルミネッセンス光を生成させる第2励起光照射手段と、
前記フォトルミネッセンス光の発光強度を測定する発光強度測定手段と、
前記反射電磁波強度検出手段の検出データおよび前記発光強度測定手段の測定データに基づいて前記試料の移動度、およびストレス耐性を評価する評価手段と、
を備えると共に、
前記第1励起光照射手段と前記第2励起光照射手段は、同一または異なる励起光照射手段であることを特徴とする酸化物半導体薄膜の評価装置。 - 前記第1励起光照射手段は、前記酸化物半導体薄膜のバンドギャップ以上のエネルギーを出力する光源を有するものである請求項1に記載の酸化物半導体薄膜の評価装置。
- 前記第2励起光照射手段は、前記酸化物半導体薄膜のバンドギャップ中に存在する欠陥準位に相当するエネルギーを出力する光源を有するものである請求項1に記載の酸化物半導体薄膜の評価装置。
- 前記第2励起光照射手段は、前記酸化物半導体薄膜のバンドギャップ中に存在する欠陥準位に相当するエネルギーを出力する光源を有するものである請求項2に記載の酸化物半導体薄膜の評価装置。
- 前記第2励起光照射手段は、前記酸化物半導体薄膜から特定の波長のフォトルミネッセンス光のみを励起させるエネルギーを出力する光源を有するものである請求項3に記載の酸化物半導体薄膜の評価装置。
- 前記第2励起光照射手段は、前記酸化物半導体薄膜から特定の波長のフォトルミネッセンス光のみを励起させるエネルギーを出力する光源を有するものである請求項4に記載の酸化物半導体薄膜の評価装置。
- 前記第1励起光と前記第2励起光の光路上に、前記第1励起光、前記第2励起光のうち少なくとも一方の光路を変更する光路切り替え手段を備えている請求項1~6のいずれかに記載の酸化物半導体薄膜の評価装置。
- 前記光路切り替え手段は、前記第1励起光と前記第2励起光が、前記試料の同一、または異なる測定箇所に照射するように設置されている請求項7に記載の酸化物半導体薄膜の評価装置。
- 前記第1励起光と前記電磁波を前記試料の前記測定部位に誘導する導波管を備えると共に、前記導波管の前記試料側開口部近傍の側面に、前記第2励起光の導入口が設けられている請求項1~6のいずれかに記載の酸化物半導体薄膜の評価装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/917,452 US20160223462A1 (en) | 2013-09-13 | 2014-09-10 | Evaluation device for oxide semiconductor thin film |
KR1020167006238A KR101648696B1 (ko) | 2013-09-13 | 2014-09-10 | 산화물 반도체 박막의 평가 장치 |
EP14844691.7A EP3046141B1 (en) | 2013-09-13 | 2014-09-10 | Evaluation device for oxide semiconductor thin film |
CN201480050138.0A CN105518843B (zh) | 2013-09-13 | 2014-09-10 | 氧化物半导体薄膜的评价装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013-190402 | 2013-09-13 | ||
JP2013190402A JP5732120B2 (ja) | 2013-09-13 | 2013-09-13 | 酸化物半導体薄膜の評価装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015037596A1 true WO2015037596A1 (ja) | 2015-03-19 |
Family
ID=52665698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/073865 WO2015037596A1 (ja) | 2013-09-13 | 2014-09-10 | 酸化物半導体薄膜の評価装置 |
Country Status (8)
Country | Link |
---|---|
US (1) | US20160223462A1 (ja) |
EP (1) | EP3046141B1 (ja) |
JP (1) | JP5732120B2 (ja) |
KR (1) | KR101648696B1 (ja) |
CN (1) | CN105518843B (ja) |
HU (1) | HUE034629T2 (ja) |
TW (1) | TWI601953B (ja) |
WO (1) | WO2015037596A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9316589B2 (en) | 2013-01-15 | 2016-04-19 | Kobe Steel, Ltd. | Method for evaluating oxide semiconductor thin film, and method for quality control of oxide semiconductor thin film |
CN108303387A (zh) * | 2017-01-11 | 2018-07-20 | 罗伯特·博世有限公司 | 用于分析测量区域的方法和微型光谱仪 |
US10090208B2 (en) | 2013-01-11 | 2018-10-02 | Kobe Steel, Ltd. | Evaluation method for oxide semiconductor thin film, quality control method for oxide semiconductor thin film, and evaluation element and evaluation device used in the evaluation method |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6283273B2 (ja) | 2014-07-01 | 2018-02-21 | 株式会社神戸製鋼所 | 薄膜トランジスタ評価用の積層構造体の評価方法 |
JP5993496B2 (ja) | 2014-07-16 | 2016-09-14 | 株式会社神戸製鋼所 | 酸化物半導体薄膜、及び前記酸化物半導体薄膜の表面に保護膜を有する積層体の品質評価方法、及び酸化物半導体薄膜の品質管理方法 |
JP6742124B2 (ja) | 2016-03-30 | 2020-08-19 | 株式会社Screenホールディングス | 基板処理装置 |
US10475711B2 (en) * | 2016-04-27 | 2019-11-12 | Kobe Steel, Ltd. | Method for evaluating quality of oxide semiconductor thin film, method for managing quality of oxide semiconductor thin film, and device for manufacturing semiconductor using said method for managing quality |
CN106910695A (zh) * | 2017-03-08 | 2017-06-30 | 京东方科技集团股份有限公司 | 一种薄膜晶体管的电性特征测试方法及装置 |
JP7175115B2 (ja) | 2018-07-19 | 2022-11-18 | 昭和電工株式会社 | SiCデバイスの製造方法および評価方法 |
CN117665524B (zh) * | 2024-01-25 | 2024-04-26 | 鲁欧智造(山东)高端装备科技有限公司 | 一种氮化镓功率器电子流动性检测系统 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010123872A (ja) * | 2008-11-21 | 2010-06-03 | Sony Corp | 酸化物半導体層の非破壊検査方法、及び酸化物半導体層の作製方法 |
JP2012033857A (ja) | 2010-06-30 | 2012-02-16 | Kobe Steel Ltd | 酸化物半導体薄膜の評価方法、及び酸化物半導体薄膜の品質管理方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3979611B2 (ja) * | 1998-04-09 | 2007-09-19 | 株式会社島津製作所 | 応力測定装置 |
JP4287692B2 (ja) * | 2003-04-25 | 2009-07-01 | 凸版印刷株式会社 | 非晶質シリコンの化合物薄膜の応力評価方法 |
JP4899120B2 (ja) * | 2006-01-13 | 2012-03-21 | 凸版印刷株式会社 | 窒化酸化シリコン膜の組成評価方法及び物性評価方法 |
CN101515558A (zh) * | 2006-03-30 | 2009-08-26 | 西安电子科技大学 | 在线检测薄膜生长率和应力的方法 |
JP5305696B2 (ja) * | 2008-03-06 | 2013-10-02 | キヤノン株式会社 | 半導体素子の処理方法 |
CN100552910C (zh) * | 2008-09-19 | 2009-10-21 | 清华大学 | 一种多层薄膜基体结构高温力学行为的在线测量装置 |
JP5290710B2 (ja) * | 2008-11-20 | 2013-09-18 | 東芝三菱電機産業システム株式会社 | 筒状抵抗器取付具および筒状抵抗器取付方法 |
WO2011017772A1 (en) * | 2009-08-14 | 2011-02-17 | Bt Imaging Pty Ltd | Detection of discontinuities in semiconductor materials |
JP2012033854A (ja) * | 2010-04-20 | 2012-02-16 | Kobe Steel Ltd | 薄膜トランジスタの半導体層用酸化物およびスパッタリングターゲット、並びに薄膜トランジスタ |
CN102313849B (zh) * | 2010-06-30 | 2014-08-06 | 株式会社神户制钢所 | 氧化物半导体薄膜的评价方法及氧化物半导体薄膜的质量管理方法 |
JP5350345B2 (ja) | 2010-09-22 | 2013-11-27 | 株式会社神戸製鋼所 | 薄膜半導体の結晶性評価装置および方法 |
JP2013070010A (ja) * | 2010-11-26 | 2013-04-18 | Kobe Steel Ltd | 薄膜トランジスタの半導体層用酸化物およびスパッタリングターゲット、並びに薄膜トランジスタ |
-
2013
- 2013-09-13 JP JP2013190402A patent/JP5732120B2/ja not_active Expired - Fee Related
-
2014
- 2014-09-10 CN CN201480050138.0A patent/CN105518843B/zh active Active
- 2014-09-10 HU HUE14844691A patent/HUE034629T2/en unknown
- 2014-09-10 US US14/917,452 patent/US20160223462A1/en not_active Abandoned
- 2014-09-10 WO PCT/JP2014/073865 patent/WO2015037596A1/ja active Application Filing
- 2014-09-10 KR KR1020167006238A patent/KR101648696B1/ko active IP Right Grant
- 2014-09-10 EP EP14844691.7A patent/EP3046141B1/en not_active Not-in-force
- 2014-09-12 TW TW103131582A patent/TWI601953B/zh not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010123872A (ja) * | 2008-11-21 | 2010-06-03 | Sony Corp | 酸化物半導体層の非破壊検査方法、及び酸化物半導体層の作製方法 |
JP2012033857A (ja) | 2010-06-30 | 2012-02-16 | Kobe Steel Ltd | 酸化物半導体薄膜の評価方法、及び酸化物半導体薄膜の品質管理方法 |
Non-Patent Citations (2)
Title |
---|
See also references of EP3046141A4 |
TOMOYA KISHI ET AL.: "Sankabutsu Handotai no Denkiteki, Kogakuteki Tokusei Hyoka (I) -Cathodoluminescence ni yoru Denshi Jotai no Process Izonsei", 2012 NEN SHUNKI DAI 59 KAI OYO BUTSURIGAKU KANKEI RENGO KOENKAI 'KOEN YOKOSHU' [ DVD -ROM], THE JAPAN SOCIETY OF APPLIED PHYSICS, 29 February 2012 (2012-02-29), pages 21 - 078, XP008179811 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10090208B2 (en) | 2013-01-11 | 2018-10-02 | Kobe Steel, Ltd. | Evaluation method for oxide semiconductor thin film, quality control method for oxide semiconductor thin film, and evaluation element and evaluation device used in the evaluation method |
US9316589B2 (en) | 2013-01-15 | 2016-04-19 | Kobe Steel, Ltd. | Method for evaluating oxide semiconductor thin film, and method for quality control of oxide semiconductor thin film |
CN108303387A (zh) * | 2017-01-11 | 2018-07-20 | 罗伯特·博世有限公司 | 用于分析测量区域的方法和微型光谱仪 |
CN108303387B (zh) * | 2017-01-11 | 2022-03-15 | 罗伯特·博世有限公司 | 用于分析测量区域的方法和微型光谱仪 |
Also Published As
Publication number | Publication date |
---|---|
KR101648696B1 (ko) | 2016-08-16 |
JP2015056583A (ja) | 2015-03-23 |
HUE034629T2 (en) | 2018-02-28 |
US20160223462A1 (en) | 2016-08-04 |
EP3046141A1 (en) | 2016-07-20 |
EP3046141A4 (en) | 2016-09-28 |
CN105518843B (zh) | 2018-09-04 |
TW201530126A (zh) | 2015-08-01 |
CN105518843A (zh) | 2016-04-20 |
TWI601953B (zh) | 2017-10-11 |
KR20160031564A (ko) | 2016-03-22 |
JP5732120B2 (ja) | 2015-06-10 |
EP3046141B1 (en) | 2017-07-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5732120B2 (ja) | 酸化物半導体薄膜の評価装置 | |
EP3079165B1 (en) | Method for evaluating an oxide semiconductor thin film and for managing quality of the oxide semiconductor thin film | |
KR101251123B1 (ko) | 산화물 반도체 박막의 평가 방법 및 산화물 반도체 박막의 품질 관리 방법 | |
JP5814558B2 (ja) | 酸化物半導体薄膜の評価方法、及び酸化物半導体薄膜の品質管理方法 | |
JP2008191123A (ja) | 薄膜半導体の結晶性測定装置及びその方法 | |
US8952338B2 (en) | Crystalline quality evaluation apparatus for thin-film semiconductors, using μ-PCD technique | |
JP6204036B2 (ja) | 酸化物半導体薄膜の評価方法、及び酸化物半導体薄膜の品質管理方法 | |
TWI552233B (zh) | An oxide semiconductor thin film, and a thin film of the oxide semiconductor The quality evaluation method of the laminated body having the protective film on the surface of the film, and the quality management method of the oxide semiconductor thin film | |
CN106463433B (zh) | 氧化物半导体薄膜层叠体的品质评价方法及品质管理方法 | |
US10230003B2 (en) | Method of evaluating thin-film transistor, method of manufacturing thin-film transistor, and thin-film transistor | |
EP2538204B1 (en) | Photoinduced carrier lifetime measuring method, light incidence efficiency measuring method, photoinduced carrier lifetime measuring device, and light incidence efficiency measuring device | |
JP5242287B2 (ja) | 半導体薄膜の結晶性評価装置及び結晶性評価方法 | |
JP5301770B2 (ja) | 薄膜半導体の結晶性測定装置及びその方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14844691 Country of ref document: EP Kind code of ref document: A1 |
|
REEP | Request for entry into the european phase |
Ref document number: 2014844691 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2014844691 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14917452 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 20167006238 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |