CN104503008B - Compound structure with function of improving wide-spectrum light absorption efficiency - Google Patents
Compound structure with function of improving wide-spectrum light absorption efficiency Download PDFInfo
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- CN104503008B CN104503008B CN201410839917.0A CN201410839917A CN104503008B CN 104503008 B CN104503008 B CN 104503008B CN 201410839917 A CN201410839917 A CN 201410839917A CN 104503008 B CN104503008 B CN 104503008B
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- light absorption
- composite construction
- triangular groove
- wide range
- compound structure
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/12—Reflex reflectors
- G02B5/122—Reflex reflectors cube corner, trihedral or triple reflector type
Abstract
The invention discloses a compound structure with a function of improving the wide-spectrum light absorption efficiency. The compound structure comprises absorbing layers and reflecting layers which are compounded with one another. The absorbing layers are of photonic crystal structures, and periodic triangular grooves in the surfaces of nonmetal materials are filled with thin polymer films or thin films with colloidal quantum dots to form the photonic crystal structures; metal materials are coated on the surfaces of random triangular grooves in the bottom surfaces of the nonmetal materials to form the reflecting layers. The compound structure has the advantages that efficient absorption of broadband and wide-angle solar energy in wavebands which cover the ranges from ultraviolet waves to infrared waves can be improved by the aid of the compound structure, the infrared wavebands exceed Yablonovitch limit, electric fields in the triangular grooves in the surfaces of the absorbing layers and in cavities formed by the reflecting layers and the triangular grooves in the surfaces of the absorbing layers can be greatly strengthened, and the compound structure has an excellent application prospect in the aspects of solar cells, photoelectric detection, military stealth and the like.
Description
Technical field
The present invention relates to a kind of composite construction being made up of absorbed layer and reflecting layer, particularly one kind contain photon crystal structure
With random metal triangular groove catoptric arrangement, to improve the composite construction of wide range efficiency of light absorption.
Background technology
Realize efficient wideband electromagnetic ripple to absorb in solar cell, Photoelectric Detection, the military field such as stealthy is to weigh very much
Want.
Nineteen eighty-two, yablonovitch proposes the light absorbs limit in uniform semiconductive thin film.However,
The yablonovitch limit is only applicable to geometric optics, but in micro-nano structure, diffraction, reflection and refraction collective effect, light
Absorption can surmount the yablonovitch limit.At present, scientists have been proposed for much containing the optical coupling knot of precious metal material
Structure realizing the enhancing of sun light absorbs, divide periodically and aperiodic structure by these coupled structures.2009, hu et al. was in knot
Structure upper strata introduces the square metal block structure of periodic arrangement, improves (1 μm ~ 5.5um) multiple arrowband near infrared band high
Absorb (document 1, boyang zhang, joshua hendrickson and junpeng guo, multi-spectral
near perfect metamaterial absorbers using spatially multiplexed plasmon
Resonance metal square structures, jouranl of the optical society of america
b-optical physics,2013,30(3):656)；2011, liu et al. in structure layer introduce periodic arrangement gold
Belong to hemisphere shell structure it is achieved that near infrared band in (1 μm ~ 2.6 μm) double arrowbands high-selenium corn (document 2, zhengqi liu,
peng zhan, jing chen, chaojun tang, zhendong yan, zhuo chen, and zhenlin wang
, dual broadband near-infrared perfect absorber based on a hybrid plasmonic-
Photonic, optics express, 2013,21 (3): 3021-3030)；2012, s ndergaard et al. was in structure
Layer introduces the sharp metal tongue structure of periodic arrangement it is achieved that the high-selenium corn (document of visible-range interior (450nm ~ 850nm)
3, t. s ndergaard, s. m. novikov, t. holmgaard, r. l. eriksen, j. beermann, z.
han, k. pedersen, and s. i. bozhevolnyi, plasmonic black gold by adiabatic
nanofocusing and absorption of light in ultra-sharp convex
Grooves, nature commun, 2012.3:969).But because periodic structure can only be realized at mode of resonance
Arrowband high-selenium corn, so in order to realize wide band absorption, aperiodic structure also receives very big the paying close attention to of scientists.2004
Year, joachim et al. devises the coupled structure being made up of si, tco and argent reflecting plate, and the upper surface of si, lower surface
And bottom metal silver surface all have the triangle slot structure of random alignment it is achieved that in visible-range (400nm ~
700nm) efficient absorption (document 4, joachim muller, bernd rech, jiri springer, milan
vanecek, tco and light trapping in silicon thin film solar cells, 2004.77:
917-930)；2009, rahul dewan et al. proposed similar structure, anti-by transparent conductive oxide, si and metal
Penetrate the coupled structure of plate composition, and the upper and lower surface of si all has the triangle slot structure of random alignment, and bottom metal
For slab construction it is achieved that higher quantum efficiency (document 5, rahul dewan in wave-length coverage 300nm ~ 1100nm
and dietmar knipp, light trapping in thin-film silicon solar cells with
integrated diffraction grating, journal of applied physics, 2009,106(7):
074901).But still there is absorption band width or the low problem of absorption efficiency in these aperiodic structures, and solar energy capture,
Broadband photoelectric detection and military stealthy wait field, raising near ultraviolet to the broadband of infrared band, efficient light absorbs is simultaneously
Critically important.
Existing open source literature is using a kind of composite construction being made up of absorbed layer and reflecting layer, and comprises photon crystal structure
With random metal triangular groove catoptric arrangement, be yet there are no with strengthening near ultraviolet to the broadband light absorbs of infrared band (0.3 μm ~ 10 μm)
Report.
Content of the invention
Based on above-mentioned prior art, it is an object of the invention to provide a kind of composite junction improving wide range efficiency of light absorption
Structure, can achieve broadband, effective, the wide angle electro-magnetic wave absorption covering near ultraviolet to infrared band, and in infrared band
Exceed the yablonovitch limit.In relatively narrow wavelength bands, only realize light absorbs enhancing and be less than to solve existing structure
The problem of the yablonovitch limit.
For reaching above-mentioned purpose, the present invention provides a kind of composite construction improving wide range efficiency of light absorption, including metal material
Material and nonmetallic materials it is characterised in that:
Described composite construction is to be combined and constituted by absorbed layer and reflecting layer；
Described absorbed layer is to offer periodic triangular groove on the surface of nonmetallic materials si, and in periodic triangular groove
It is filled with thin polymer film or Colloidal Quantum Dots film constitutes photon crystal structure；Described reflecting layer is by nonmetallic materials si
Bottom face offer random triangular groove, and random triangle rooved face be coated with metal material au constitute.
Further, supplementary technology scheme is as follows:
The thickness d of described si is: 2 μm≤d≤10 μm.
Described cycle t is: 1.8 μm≤t≤10 μm.
Described cycle t ≈ d.
The described triangular groove absorbing layer surface is more than the triangular groove of reflection layer surface.
Described each triangular groove absorbing layer surface corresponds to reflect the multiple random triangular groove of layer surface.
The height sum of described si surface triangle groove height and bottom face triangular groove is less than l.
The thickness t of described metal material au is: t >=100nm.
The described thin polymer film or the refractive index of Colloidal Quantum Dots film of being filled with is 1.3-1.77.
Realize a kind of composite construction of raising wide range efficiency of light absorption that the invention described above is provided, its sum directly brought
The advantage necessarily leading to is as follows with good effect.
This composite construction increased optical path, thus strengthening optical diffraction and scattering it is achieved that very big light absorbs strengthen,
Exceed the yablonovitch limit in infrared band light absorbs, for tm mould, average absorption in 0.3 ~ 10 μm of whole wave band
Efficiency up to more than 85%, for te mould, absorption efficiency up to more than 90% in 0.3 ~ 0.7 μ m, and tm, te mould for
The change of polarization and angle is little to overall structure inhalation effects.
This composite construction has obvious enhanced intensity effect, and in shorter wavelength scope, electric-field enhancing is concentrated mainly on suction
Receive in the triangular groove of layer surface, in longer wavelength scope, electric field is in the triangular groove absorbing layer surface with by absorption layer surface
There is enhancing in the chamber of triangular groove and reflecting layer composition, add thin polymer film or Colloidal Quantum Dots in the enhanced position of field intensity
Film can further enhance absorption.
This composite construction, when the thickness d of cycle t and si increases simultaneously, has greatly widened the wave band model of light absorbs
Enclose, even up to 0.3 ~ 10 μm, and the efficiency of light absorption of structure is still very high.
A kind of composite construction improving wide range efficiency of light absorption provided by the present invention, in design solar cell, optics
Detection, the military aspect such as stealthy have very big application prospect.
Brief description
Fig. 1 is the structure (schematic cross-section of structure a) of the present invention.
Fig. 2 is the schematic cross-section with structure b of present configuration contrast.
Fig. 3 is the schematic cross-section with structure c of present configuration contrast.
Fig. 4 is the schematic cross-section with structure d of present configuration contrast.
Fig. 5 is the schematic cross-section with structure e of present configuration contrast.
Fig. 6 is the refractive index of au and si in 0.3 ~ 2.0 μ m.
Fig. 7 be present configuration in t when changing to 3.0 μm for 0.5 μm, under the conditions of vertical incidence, tm mould is at 0.3 ~ 2.0 μm
In the range of absorption efficiency.
Fig. 8 be present configuration in t when changing to 3.0 μm for 0.5 μm, under the conditions of vertical incidence, te mould is at 0.3 ~ 2.0 μm
In the range of absorption efficiency.
Fig. 9 be present configuration at t=1.8 μm, when changing to 80 degree for 0 degree, tm mould is in 0.3 ~ 2.0 μm of model for incident angle
Absorption efficiency in enclosing.
Figure 10 be present configuration at t=1.8 μm, when changing to 80 degree for 0 degree, te mould is in 0.3 ~ 2.0 μm of model for incident angle
Absorption efficiency in enclosing.
When Figure 11 is t=1.8 μm, absorption contrast in 0.3 ~ 2.0 μ m for structure (a-e) the tm mould.(a-e) solid line in
The absorption curve of each structure obtaining for rigorous couple-wave analysis method, the absorption that dotted line obtains for finite time-domain calculus of finite differences is bent
Line, dotted line is the yablonovitch limit.
When Figure 12 is t=1.8 μm, absorption contrast in 0.3 ~ 2.0 μ m for structure (a-e) the te mould.(a-e) solid line in
The absorption curve of each structure obtaining for rigorous couple-wave analysis method, dotted line is the yablonovitch limit.
Figure 13 is tm distribution map of the electric field at wavelength 0.4 mum wavelength for the present configuration.
Figure 14 is tm distribution map of the electric field at wavelength 1.2 mum wavelength for the present configuration.
Figure 15 is tm distribution map of the electric field at wavelength 1.8 mum wavelength for the present configuration.
Figure 16 when the pulse with covering 0.3 ~ 2.0 mu m waveband scope is incident, tri- typical positions of Fig. 1 structure and Fig. 5
The time dependent contrast of field intensity put: field intensity in the triangular groove absorbing layer surface for (a) position；(b) position with anti-
Penetrate the field intensity in the distant chamber of layer；Field intensity near the random triangular groove of reflection layer surface for (c) position.
Specific embodiments
For making the purpose of the present invention, technical scheme and effect clearer, below in conjunction with accompanying drawing and specific embodiment
The specific embodiment of the present invention is made and further illustrates.
We have proposed a kind of composite construction being made up of absorbed layer and reflecting layer.The random metal triangular of reflection layer surface
Groove increased optical path, thus strengthening optical diffraction and scattering.By introducing the random triangular groove of metal it is achieved that very big light is inhaled
Receive and electric-field enhancing, light absorbs have been even more than the yablonovitch limit.And for tm mould and te mould, absorption efficiency for
Polarization and angle change are insensitive.Realize efficient absorption near ultraviolet to infrared band simultaneously.This structure is in design solar energy
Battery, Photoelectric Detection, the military aspect such as stealthy have very big application prospect.
A kind of composite construction improving wide range efficiency of light absorption provided by the present invention, as shown in Figure 1, using metal material
And nonmetallic materials, taking a cycle as a example, its composition is: described composite construction is to be combined and structure by absorbed layer and reflecting layer
Become；Described absorbed layer is to offer periodic triangular groove on the surface of nonmetallic materials si, and fills in periodic triangular groove
Thin polymer film or Colloidal Quantum Dots film constitute photon crystal structure；Described reflecting layer is by the bottom of nonmetallic materials si
Face offers random triangular groove, and is coated with metal material au in random triangle rooved face and constitutes.
Wherein, the thickness d of si of the present invention is: d=2 μm.Described cycle t is: t=1.8 μm.Surface photon crystal one
The uneven triangular groove in the corresponding bottom 8 of individual periodic trigonometric groove.Described si surface triangle groove height and the height of bottom face triangular groove
Sum is less than d.The thickness t of described metal material au is: t=100nm.Described it is filled with thin polymer film or Colloidal Quantum Dots
The refractive index of film is 1.5.
A kind of composite construction being made up of absorbed layer and reflecting layer that Fig. 1 provides for the present invention, comprise nonmetallic materials and
Metal material.Offer periodic triangular groove on the surface of nonmetallic materials si, and filled polymer in periodic triangular groove
Film or Colloidal Quantum Dots film constitute photon crystal structure；Surface photon crystal a cycle triangular groove corresponds to bottom 8
Uneven triangular groove, and triangular groove is all isosceles right angle trigonometry groove.
The inherent loss of the metal material au in composite construction of the present invention and nonmetallic materials si is taken into account, au and
The complicated refractive index of si as shown in Figure 6, in rigorous couple-wave analysis method (rcwa) and finite time-domain calculus of finite differences (fdtd), si
Refractive index derive from palik parameter with the change of wavelength, the refractive index of au is respectively derived from palik parameter with the change of wavelength
With johnson and christy parameter.
Accompanying drawing 7, accompanying drawing 8 be present configuration under the conditions of vertical incidence, in 0.3 μm of wavelength in 2.0 μ m, the cycle
T when changing to 3.0 μm for 0.5 μm, the impact to tm, te mould absorption efficiency respectively.For tm mould, as shown in Figure 7, when t is big
In 1.7 μm, average absorption efficiency in 0.3 ~ 2.0 μm of whole wave band is higher than 85 %, and for te mould, high absorption efficiency
In 0.3 ~ 0.7 μ m.
Accompanying drawing 9, accompanying drawing 10 are that respectively present configuration selects t=1.8 μm, in 0.3 μm of wavelength in 2.0 μ m, enter
Firing angle degree when changing to 80 degree for 0 degree, the Changing Pattern of tm, te mould absorption efficiency.We demonstrate that the absorption of proposed structure
Efficiency is insensitive for incident angle.
, for present configuration when t=1.8 μm, five kinds of structures (as accompanying drawing 1 arrives accompanying drawing 5) are from wavelength for accompanying drawing 11, accompanying drawing 12
0.3 μm of tm and te mould absorption spectra contrast in 2.0 μ m.Accompanying drawing 11 is the absorption contrast of tm mould, and accompanying drawing 12 is te mould
Absorb contrast.In above-mentioned in figure, solid line is rcwa result, and dotted line is fdtd result, and dotted line represents the yablonovitch limit.From
Accompanying drawing 11 is it can be confirmed that the result of rcwa with fdtd is consistent.Structure proposed by the present invention for tm mould absorption efficiency not
It is only above other four kinds of structures, or even in infrared band beyond the yablonovitch limit.Similarly, the absorption efficiency of te mould
Also above other four kinds of structures, due to being one-dimentional structure, so the absorption efficiency of tm mould is better than te mould.
Accompanying drawing 13 to the wavelength that accompanying drawing 15 is calculated by rcwa for present configuration be 0.4 μm, 1.2 μm, 1.8 μm when
Distribution map of the electric field to more fully understand the enhanced mechanism of light absorbs.Here, we are taking tm mould vertical incidence as a example.From attached
Figure 13 can be seen that in shorter wavelength scope, and electric-field enhancing is concentrated mainly in the triangular groove absorbing layer surface.From accompanying drawing 14,
Accompanying drawing 15 is as can be seen that in longer wavelength scope, electric field is in the triangular groove absorbing layer surface with by the triangle absorbing layer surface
There is enhancing in the chamber of groove and reflecting layer composition.And, the result of field strength distribution is verified also by fdtd.
Figure 16 when the pulse with covering 0.3 ~ 2.0 mu m waveband scope is incident, tri- typical positions of Fig. 1 structure and Fig. 5
The time dependent contrast of field intensity put: field intensity in the triangular groove absorbing layer surface for (a) position；(b) position with anti-
Penetrate the field intensity in the distant chamber of layer；Field intensity near the random triangular groove of reflection layer surface for (c) position.As can be seen that
In present configuration, the field intensity of three exemplary position is all big than the amplitude of Fig. 5 structure in 0 ~ 200fs, thus verifying in time domain
Advantage in terms of enhanced intensity for the present configuration.
Above example fully demonstrate a kind of composite construction of raising wide range efficiency of light absorption of the present invention with other four
Kind of structure compares, and can preferably reach efficient, broadband, wide angle electro-magnetic wave absorption.
Particular embodiments described above, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Illustrate, be should be understood that the specific embodiment that the foregoing is only the present invention, be not limited to the present invention, all
On the spirit and principles in the present invention, any modification, equivalent substitution and improvement done etc., should be included in the protection of the present invention
Within the scope of.
Claims (8)
1. a kind of improve wide range efficiency of light absorption composite construction, including metal material and nonmetallic materials it is characterised in that:
Described composite construction is to be combined and constituted by absorbed layer and reflecting layer；
Described absorbed layer is to offer periodic triangular groove on the surface of nonmetallic materials si, and fills in periodic triangular groove
Thin polymer film or Colloidal Quantum Dots film is had to constitute photon crystal structure；
Described reflecting layer is to offer random triangular groove by the bottom face of nonmetallic materials si, and in the coating of random triangle rooved face
Metal material au is had to constitute.
2. according to claim 1 improve wide range efficiency of light absorption composite construction it is characterised in that: the thickness of described si
D is: 2 μm≤d≤10 μm.
3. according to claim 1 improve wide range efficiency of light absorption composite construction it is characterised in that: described periodicity three
The cycle t of chamfered groove is: 1.8 μm≤t≤10 μm.
4. according to claim 1 improve wide range efficiency of light absorption composite construction it is characterised in that: described absorbed layer table
The triangular groove in face is more than the triangular groove of reflection layer surface.
5. according to claim 4 improve wide range efficiency of light absorption composite construction it is characterised in that: described absorbed layer table
Each triangular groove in face corresponds to reflect the multiple random triangular groove of layer surface.
6. according to claim 1 and 2 improve wide range efficiency of light absorption composite construction it is characterised in that: described si table
The height sum of face triangle groove height and bottom face triangular groove is less than d.
7. according to claim 1 improve wide range efficiency of light absorption composite construction it is characterised in that: described metal material
The thickness t of au is: t >=100nm.
8. according to claim 1 improve wide range efficiency of light absorption composite construction it is characterised in that: described be filled with poly-
The refractive index of compound film or Colloidal Quantum Dots film is 1.3-1.77.
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| CN105068184B (en) * | 2015-07-24 | 2018-01-05 | 太原理工大学 | A kind of 2 D photon crystal composite construction for strengthening wide range light absorbs |
| CN105334552B (en) * | 2015-11-04 | 2017-09-26 | 苏州大学 | Visible light wave range wide angle areflexia composite based on impedance matching |
| CN105883004A (en) * | 2016-05-30 | 2016-08-24 | 张占月 | Satellite with optical camouflage function |
| CN112817073B (en) * | 2020-12-31 | 2022-02-01 | 南京航空航天大学 | Infrared wave absorbing device based on principle of non-reflection filter |
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| JP2008163197A (en) * | 2006-12-28 | 2008-07-17 | Nippon Shokubai Co Ltd | Near-infrared-absorbing self-adhesive composition |
| JP2008191587A (en) * | 2007-02-07 | 2008-08-21 | Nippon Sheet Glass Co Ltd | Polarizer |
| KR101097350B1 (en) * | 2010-05-04 | 2011-12-23 | 삼성모바일디스플레이주식회사 | Film for enhancing visibility, method for preparing the same, and organic light emitting device comprising the same |
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