WO2004021458A1 - 発光素子およびその製造方法 - Google Patents
発光素子およびその製造方法 Download PDFInfo
- Publication number
- WO2004021458A1 WO2004021458A1 PCT/JP2003/010961 JP0310961W WO2004021458A1 WO 2004021458 A1 WO2004021458 A1 WO 2004021458A1 JP 0310961 W JP0310961 W JP 0310961W WO 2004021458 A1 WO2004021458 A1 WO 2004021458A1
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- WO
- WIPO (PCT)
- Prior art keywords
- substrate
- film
- fesi
- type
- light emitting
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 22
- 239000000758 substrate Substances 0.000 claims abstract description 105
- 229910006585 β-FeSi Inorganic materials 0.000 claims description 61
- 238000000137 annealing Methods 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000004544 sputter deposition Methods 0.000 claims description 9
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910006578 β-FeSi2 Inorganic materials 0.000 abstract 5
- 229910005329 FeSi 2 Inorganic materials 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000000407 epitaxy Methods 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 239000013081 microcrystal Substances 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 238000005424 photoluminescence Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 206010048334 Mobility decreased Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001194 electroluminescence spectrum Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010415 tropism Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/0004—Devices characterised by their operation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/36—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the electrodes
- H01L33/40—Materials therefor
Definitions
- the present invention relates to a light emitting device and a method for manufacturing the same.
- ⁇ -F e S i 2 has attracted attention.
- ⁇ -F e Si 2 is a resource-rich, harmless and chemically stable semiconductor.
- ⁇ -F e S i 2 is a direct transition semiconductor with a band gap of about 0.85 eV.
- beta-F e S i 2 is capable Epitakisharu growth of S i on the substrate. Therefore, (3- F e S i 2 are not small environmental load, and is expected as a material for the next generation of light-emitting and receiving elements.
- the present invention aims to provide a light emitting device having a beta-F e S i 2 film on S i substrate.
- the present invention relates to a light emitting device.
- This light emitting device includes a Si substrate, a ⁇ -FeSi 2 film that is in contact with the Si substrate, and first and second electrodes provided on both sides of the Si substrate.
- the p_F e Si 2 film has a conductivity type different from the conductivity type of the Si substrate.
- First and second electrodes are sandwiching the S i substrate and beta-F e S i 2 film.
- a pn junction is formed between the Si substrate and the ⁇ -FeSi 2 film.
- the ⁇ -FeSi 2 film emits light. Since ⁇ -FeSi 2 continuously arranged on the Si substrate functions as a light emitting layer, the light emitting characteristics of the light emitting element are hardly affected by the type and purity of the substrate.
- the present invention relates to a method for manufacturing a light-emitting element.
- a light emitting device including a Si substrate, a ⁇ -FeSi 2 film in contact with the Si substrate, and first and second electrodes provided on both sides of the Si substrate is manufactured.
- beta-F e S i 2 film has a different conductivity type as that of the S i substrate.
- First and second electrodes are sandwiching the S i substrate and beta-F e S i 2 film.
- This method includes heating and cleaning the Si substrate, forming an initial layer of ( ⁇ —FeSi 2) at the first temperature on the Si substrate, and forming the initial layer at the first temperature. more grown in high second temperature beta-F e S i 2 film to form a, and to ⁇ Neil the second higher than the temperature the third at a temperature of beta-F e S i 2 film Have.
- the above light emitting element can be manufactured.
- a highly crystalline ⁇ -FeSi 2 film is formed on the Si substrate.
- FIG. 1 is a cross-sectional view illustrating a light emitting device according to an embodiment. [001 2]
- FIG. 2 is a plan view of the light emitting device shown in FIG.
- FIG. 3 is a graph showing the EL intensity when a current is injected into the luminous element shown in FIG.
- FIG. 4 is a graph showing a result of an X-ray diffraction analysis of a non-annealed ⁇ -FeSi 2 film on a Si substrate.
- FIG. 5 is a graph showing the relationship between the photon energy and the absorption coefficient of a non-annealed ⁇ -FeSi 2 film on a Si substrate.
- FIG. 1 is a sectional view showing a light emitting device 10 according to the first embodiment of the present invention.
- FIG. 2 is a plan view of the light emitting device 10.
- the light emitting element 10 includes a Si substrate 1, a ⁇ -FeSi 2 film 2, a lower electrode 3, and an upper electrode 4.
- the p_FeSi 2 film 2 and the upper electrode 4 are provided on the front side of the substrate 1.
- the lower electrode 3 is provided on the back side of the substrate 1.
- the lower electrode 3 and the upper electrode 4 sandwich the substrate 1 and the ⁇ -FeSi 2 film 2.
- the Si substrate 1 is an n-type Si (1 1 1) substrate manufactured by the Czochra sk i (CZ) method, that is, a substrate having a main surface with a plane orientation (1 1 1). The size of the substrate 1 is 2 inches.
- Substrate 1 has a front surface 1A and a back surface 1B located on opposite sides of each other.
- the p_F e Si 2 film 2 is provided on the Si substrate 1 so as to cover the entire surface 1 A of the Si substrate 1.
- ⁇ - F e S i 2 l trillions 2 has a surface 2 A and the back 2 B located opposite each other.
- the back surface 2B is in contact with the front surface 1A of the Si substrate 1.
- the thickness of the ⁇ -FeSi 2 film 2 is preferably 100 to 250 nm, more preferably Or 100-200 nm. In the present embodiment, the thickness of the ⁇ -FeSi 2 film 2 is 200 nm.
- the conductivity type of the ⁇ -FeSi 2 film 2 is p-type, unlike the Si substrate 1.
- the first electrode 3 is provided on the Si substrate 1 so as to cover the entire back surface 18 of the 31 substrate 1, as shown in FIG. Electrode 3 is made of A1 metal
- the second electrodes 4 are provided at equal intervals on the surface 2A of the ⁇ -FeSi 2 film 2, as shown in FIGS.
- the planar shape of the electrode 4 is circular.
- Electrode 4 is made of A1 metal, like electrode 3.
- the temperature of the Si substrate 1 is increased, and the substrate 1 is heated and cleaned.
- the cleaning step 2 ⁇ 10- 7 To rr raised under the background pressure up to 8 50 ° C the temperature of the substrate 1, the temperature is maintained for 30 minutes.
- a thin initial layer of ⁇ -FeSi 2 is formed on the surface 1A of the substrate 1 that has been subjected to the heat cleaning.
- a high vacuum sputtering machine To form the initial layer, use a high vacuum sputtering machine
- an RF magnetron sputtering device equipped with a load lock device is used.
- a known RF magnetron sputtering device can be used.
- the RF magneto sputtering system can form a ⁇ -FeSi 2 film at low temperature and high speed.
- the growth temperature is preferably 440 to 550 ° C, more preferably 480 to 520 ° C. In this embodiment, the growth temperature is 500 ° C. At this temperature, a 99.99% pure Fe target is sputtered to form a p-FeSi 2 initial layer.
- the conductivity type of this initial layer is p-type.
- the thickness of the initial layer is preferably between 5 and 80 nm. In this embodiment, the thickness of the initial layer is 20 nm.
- the argon pressure is controlled at 31 CT 3 Torr.
- the temperature of the substrate 1 on which the initial layer is formed is changed by the RF magnetron.
- the sputtering apparatus was increased to 730 ⁇ 760 ° C, to grow a ⁇ - F e S i 2 initial layer at a rate of 35 nm / hour to a thickness of 200 nm.
- the film thickness of ⁇ -FeS is measured by observing the cross section of the film using a scanning electron microscope (SEM).
- SEM scanning electron microscope
- the obtained ⁇ -FeSi 2 film has a substantially flat surface. Its conductivity type is p-type.
- hole concentration of ⁇ - F e S i 2 film, Ri 10 18 cm- 3 units der at room temperature, the hole mobility is about 20 cm 2 / V ⁇ s at room temperature.
- the Aniru the ⁇ - F e S i 2 film is obtained.
- the temperature of the thermal annealing is preferably from 790 to 850 ° C. In this embodiment, the annealing temperature is 800 ° C.
- the Si substrate 1 on which the ⁇ -FeSi 2 film is formed is exposed to a nitrogen atmosphere at 800 ° C. for 20 hours. This thermal annealing is performed in a quartz tube.
- the conductivity type of the ⁇ _FeSi 2 film remains p-type.
- a pn junction is formed between the n-type Si substrate 1 and the p-type ⁇ -FeSi 2 film 2.
- electrodes are formed on the front and back sides of the Si substrate 1. Specifically, A 1 metal is vacuum-deposited on the back surface 1 B of the Si substrate 1 to form the lower electrode 3. Also, the A 1 metal is vacuum deposited using a mask on beta-F e S i 2 film 2 on the surface 2 A, to form the upper electrode 4. Either the lower electrode 3 or the upper electrode 4 may be formed first. When these electrodes 3 and 4 are formed, the light emitting device 10 of the present embodiment is completed.
- FIG. 3 shows the dependence of the EL spectrum on the forward current. As is evident from Fig. 3, the higher the current injected, the higher the EL intensity.
- the light emitting element 10 has a ⁇ -FeSi 2 film 2 provided continuously on the Si substrate 1 as a light emitting layer. Therefore, the light emission characteristics are hardly affected by the type and purity of the substrate. Therefore, it is easy to control the manufacturing process of the light emitting element 10.
- a large area wafer having a plurality of uniform light emitting elements 10 can be manufactured by using sputtering. Since sputtering is simple and low-cost, the light-emitting element 10 can be mass-produced at low cost.
- the present inventors have found that, when the annealing of the ⁇ -FeSi 2 film is performed at a higher temperature, the conductivity type of the ⁇ -FeSi 2 film changes from p-type to n-type.
- a light emitting device having an n-type ⁇ -FeSi 2 film on a p-type Si substrate is manufactured by utilizing the change in conductivity type.
- the light emitting element 20 of the present embodiment has the configuration shown in FIG. 1, as in the first embodiment. However, the type and conductivity type of the substrate 1 and the conductivity type of the ⁇ -FeSi 2 film 2 are different from those of the first embodiment.
- the Si substrate 1 is a p-type Si (1 1 1) substrate manufactured by the floating zone (F Z) method.
- the size of the substrate is 2 inches.
- This method includes a cleaning step, an initial layer forming step, a growing step, and an erroring step, as in the first embodiment.
- the cleaning step as in the first embodiment, to raise the temperature of the substrate 1 to 8 5 0 ° C under a background pressure of 2 x 1 0- 7 T orr, temperature For 30 minutes.
- an Fe target having a purity of 99.9% is sputtered to form a ⁇ -FeSi 2 initial layer having a thickness of 5 to 80 nm.
- the growth temperature is 450 ° C.
- the conductivity type of the initial layer is ⁇ type.
- an RF magnetron sputtering device is used for the sputtering.
- the argon pressure is controlled at 3 ⁇ 10 " 3 Torr.
- the temperature of the substrate 1 on which the initial layer was formed was raised to 700 to 720 ° C. in an RF magnet sputtering apparatus, and the ⁇ -FeSi 2 initial The layer is grown to a thickness of 250 nm.
- the conductivity type of the ⁇ -FeSi 2 film remains p-type.
- the hole concentration of the ⁇ -FeSi 2 film is 2 ⁇ 10 18 cm— 3 at room temperature, and its hole mobility is 20 cm 2 / V ⁇ s at room temperature.
- the ⁇ -FeSi 2 film is annealed.
- the temperature of the thermal annealing is preferably from 880 to 900 ° C. In this embodiment, the airing temperature is 890 ° C.
- the Si substrate 1 on which the ⁇ -FeSi 2 film is formed is exposed to a nitrogen atmosphere at 890 ° C. for 20 hours. This thermal annealing is performed in a quartz tube. Due to the thermal annealing, the conductivity type of the ⁇ -FeSi 2 film changes from p-type to n-type. As a result, a pn junction is formed between the p-type Si substrate 1 and the ⁇ -type ⁇ -FeSi 2 film 2.
- the 890 ° C annealing lowers the carrier concentration and increases the mobility. Specifically, an electron concentration of 3 to 10 ⁇ 10 16 cm— 3 and a mobility of at most 230 cm 2 / V ⁇ s are obtained.
- the lower electrode 3 and the upper electrode 4 are formed in the same manner as in the first embodiment. Thereby, the light emitting element 20 of the present embodiment is completed.
- the light emitting element 2 at room temperature is obtained. 0 can emit light.
- a light emitting device 20 having, as a light emitting layer, the ⁇ -FeSi 2 film 2 continuously provided on the Si substrate 1.
- the present inventors performed an X-ray diffraction analysis on the pre-anneal ⁇ -FeSi 2 film grown on the Si substrate 1.
- Figure 4 is a graph showing the results. The X-ray diffraction analysis was performed using a four-crystal diffractometer.
- the ⁇ -FeSi 2 film 2 shows only one peak over a wide range of diffraction angles. That is, a ⁇ -FeSi 2 (2 20) or (202) peak was detected next to the substrate signal. Therefore, the ⁇ -FeSi 2 film has a high (110) or (101) orientation.
- the rocking curve ( ⁇ scan) of the ⁇ -FeSi 2 peak has a half width (FWHM) of 15 arcm in. This indicates that the ⁇ -FeSi 2 peak is extremely narrow. Therefore, the ⁇ -FeSi 2 film has high crystallinity.
- the present inventors examined the in-plane epitaxy of the sample of FIG. 4 ( ⁇ lj in—p 1 anaeitaxialarrang ements). As a result, the [00 1] direction (rather than [0 10]) of ⁇ -FeS was parallel to the [1 10] direction of the Si substrate. This, ⁇ -F e S i 2 film growth direction (
- Figure 5 is a graph showing the results.
- the straight line indicated by the broken line indicates that direct transition is possible. This straight line gives a band gap of 0.82 eV at the intersection with the energy axis (horizontal axis).
- the continuous high-orientation ⁇ -FeSi 2 film can be directly grown on the Si substrate without forming an initial layer immediately after heating and cleaning.
- the half-width of the ⁇ scan of the ⁇ -FeSi 2 peak when the initial layer is not formed is 30% or more wider than when the initial layer is formed. Therefore, it can be seen that the formation of the initial layer gives a ⁇ -FeSi 2 film with higher crystallinity.
- the ⁇ _FeSi 2 film is formed on the p-type FZ—Si substrate.
- a ⁇ -FeSi 2 film having high crystallinity can be obtained by forming and growing the initial layer.
- the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.
- the electrode 4 is provided so as to be in contact with the surface 2A of the ⁇ _FeSi 2 film.
- an Si cap layer may be formed on the ⁇ -FeSi 2 film, and an electrode may be provided on the cap layer.
- an RF magnetron sputtering device is used as a high vacuum sputtering device for producing a ⁇ -FeSi 2 film on a substrate.
- other types of magnetron sputtering equipment may be used.
- RF magnetron sputtering deposition method, continuous Heavily tropism of ⁇ - F e S 1 2 film 3 i (1 1 1) Industrial Applicability can be suitably used to provide on a substrate
- the light emitting device of the present invention has a ⁇ -FeSi 2 film provided on a Si substrate as a light emitting layer. Since the light emitting layer is not a microcrystal in the substrate but a continuous film on the substrate, the light emitting characteristics of the light emitting device of the present invention are not easily affected by the type and purity of the substrate. For this reason, the light emitting device of the present invention can be manufactured by a manufacturing process that is easily controlled.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003261803A AU2003261803A1 (en) | 2002-08-30 | 2003-08-28 | Light emitting element and process for producing the same |
US11/066,318 US20050186435A1 (en) | 2002-08-30 | 2005-02-25 | Light emitting device and method for manufacturing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002255007A JP4142374B2 (ja) | 2002-08-30 | 2002-08-30 | 発光素子 |
JP2002-255007 | 2002-08-30 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/066,318 Continuation-In-Part US20050186435A1 (en) | 2002-08-30 | 2005-02-25 | Light emitting device and method for manufacturing the same |
Publications (1)
Publication Number | Publication Date |
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WO2004021458A1 true WO2004021458A1 (ja) | 2004-03-11 |
Family
ID=31972862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010961 WO2004021458A1 (ja) | 2002-08-30 | 2003-08-28 | 発光素子およびその製造方法 |
Country Status (4)
Country | Link |
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JP (1) | JP4142374B2 (ja) |
CN (1) | CN100364118C (ja) |
AU (1) | AU2003261803A1 (ja) |
WO (1) | WO2004021458A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1312734C (zh) * | 2005-01-28 | 2007-04-25 | 华中科技大学 | 飞秒脉冲激光制备β-FeSi2半导体薄膜的方法 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4920343B2 (ja) | 2006-08-24 | 2012-04-18 | 浜松ホトニクス株式会社 | 半導体素子 |
JP5687606B2 (ja) | 2011-11-14 | 2015-03-18 | トヨタ自動車株式会社 | 太陽光−熱変換部材、太陽光−熱変換装置、及び太陽熱発電装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998018167A1 (en) * | 1996-10-24 | 1998-04-30 | University Of Surrey | Optoelectronic semiconductor devices |
JP2001127338A (ja) * | 1999-10-29 | 2001-05-11 | Matsushita Electronics Industry Corp | 半導体装置及びその製造方法 |
JP2001244199A (ja) * | 2000-03-01 | 2001-09-07 | Matsushita Electric Ind Co Ltd | ベータ鉄シリサイドの成膜方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3992117B2 (ja) * | 1996-07-18 | 2007-10-17 | 昭和電工株式会社 | GaP発光素子用基板 |
JP2001064099A (ja) * | 1999-08-26 | 2001-03-13 | Matsushita Electronics Industry Corp | 薄膜の形成方法 |
JP3401594B2 (ja) * | 1999-09-29 | 2003-04-28 | 独立行政法人産業技術総合研究所 | 半導体デバイスおよびその製造方法 |
JP4080822B2 (ja) * | 2002-08-27 | 2008-04-23 | 浜松ホトニクス株式会社 | β−FeSi2膜の製造方法 |
-
2002
- 2002-08-30 JP JP2002255007A patent/JP4142374B2/ja not_active Expired - Fee Related
-
2003
- 2003-08-28 WO PCT/JP2003/010961 patent/WO2004021458A1/ja active Application Filing
- 2003-08-28 CN CNB038201828A patent/CN100364118C/zh not_active Expired - Fee Related
- 2003-08-28 AU AU2003261803A patent/AU2003261803A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998018167A1 (en) * | 1996-10-24 | 1998-04-30 | University Of Surrey | Optoelectronic semiconductor devices |
JP2001127338A (ja) * | 1999-10-29 | 2001-05-11 | Matsushita Electronics Industry Corp | 半導体装置及びその製造方法 |
JP2001244199A (ja) * | 2000-03-01 | 2001-09-07 | Matsushita Electric Ind Co Ltd | ベータ鉄シリサイドの成膜方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1312734C (zh) * | 2005-01-28 | 2007-04-25 | 华中科技大学 | 飞秒脉冲激光制备β-FeSi2半导体薄膜的方法 |
Also Published As
Publication number | Publication date |
---|---|
JP2004095858A (ja) | 2004-03-25 |
CN100364118C (zh) | 2008-01-23 |
JP4142374B2 (ja) | 2008-09-03 |
AU2003261803A1 (en) | 2004-03-19 |
CN1679175A (zh) | 2005-10-05 |
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