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Broadband micro nano two-dimensional multitooth grating trap filter

A notch filter and grating technology, applied in the field of optics, can solve the problems of unsatisfactory full polarization state absorption efficiency, great influence of angle change on the absorption coefficient of solar thin film cells, and sensitivity to incident light angles, etc., so as to improve photoelectric conversion efficiency, Facilitate large-scale integration and improve the effect of absorption

Inactive Publication Date: 2016-08-17
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0003] In the application of conventional structured gratings (uniform gratings) in solar thin film cells, or the absorption coefficient of solar thin film cells is greatly affected by the wavelength of incident light, so that part of the incident photons escape before being absorbed and converted into electrons; The angle is relatively sensitive, and the change of the angle has a great influence on the absorption coefficient of solar thin film cells; or the unilateral efficiency of TE polarized wave or TM polarized wave is high, but the comprehensive absorption efficiency of all polarization states is not ideal

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  • Broadband micro nano two-dimensional multitooth grating trap filter
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Embodiment Construction

[0021] The following is a detailed description in conjunction with the drawings:

[0022] 1. Overall

[0023] Such as figure 1 As shown, the present micro-nano grating trap is provided on the silicon active layer with gratings periodically changing along the X and Y axes, and the number of grating teeth in each period is 2, and the thickness of the grating layer is along the Z axis.

[0024] 2. Micro-nano two-dimensional multi-tooth grating layer

[0025] The grating period along the X axis is 1200 nanometers, and there are two grating teeth in each period, respectively wx 1 And wx 2 . The grating period along the Y axis is 1200 nanometers, and there are two grating teeth in each period, wy respectively 1 And wy 2 .

[0026] Its function is: to produce the leakage mode resonance effect and maintain the mutual influence of the leakage mode; expand the resonance area, which is conducive to the formation of broadband and high transmittance characteristics; in addition, it can effectively ...

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Abstract

The invention discloses a broadband micro nano two-dimensional multitooth grating trap filter, for the purpose of improving the photoelectric conversion efficiency of a silicon solar film battery. The structure is as follows: gratings periodically changing along two directions are arranged at the upper surface of a silicon active layer, each of the gratings in the two directions has two teeth, and the teeth are non-uniformly distributed in the two directions of the gratings. According to the invention, through adjusting structural dimensions of the micro nano two-dimensional multitooth gratings and positions of the grating teeth, by use of a leaky-mode resonance effect, the device has the advantages of high transmission efficiency, large bandwidth and wide angle spectrum for transverse electric wave (TE wave) and transverse magnetic wave (TM wave) incident light.

Description

Technical field [0001] The invention belongs to the field of optics and relates to a broadband micro-nano two-dimensional multi-tooth grating wave trap, which can be used on the upper surface of a solar thin film battery to improve its transmittance. Background technique [0002] Thin-film solar cells have attracted much attention because of their small size, low energy consumption, and relatively simple manufacturing process. However, due to the high reflectivity of the incident light on the surface of the solar thin film cell and the short transmission optical path inside the solar thin film cell, the sunlight cannot be fully utilized. To this end, studies have placed micro-nano structure gratings on the surface of solar thin-film cells to reduce the surface light reflectivity of solar thin-film cells, and improve the transmission path of incident light inside solar cells through refraction and scattering, and increase the absorption and utilization of solar photons rate. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18H01L31/054B82Y40/00
CPCY02E10/52G02B5/1866B82Y40/00H01L31/054
Inventor 肖文波马林飞吴华明
Owner NANCHANG HANGKONG UNIVERSITY
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