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    • 2. 发明申请
    • Selective light absorbing semiconductor surface
    • 选择性光吸收半导体表面
    • US20080066797A1
    • 2008-03-20
    • US11825558
    • 2007-07-05
    • Avto TavkhelidzeAmiran BibilashviliZara Taliashvili
    • Avto TavkhelidzeAmiran BibilashviliZara Taliashvili
    • H01L35/16
    • H01L31/055H01L31/02363Y02E10/52
    • A selective light absorbing semiconductor surface is disclosed. Said semiconductor surface is characterized by the presence of indentations or protrusions comprising a grating of dimensions such as to enhance the absorption of selected frequencies of radiation. In a preferred embodiment of the present invention, said grating is formed on the surface of a doped semiconductor for the purposes of optical frequency down conversion. The semiconductor is doped so as to create energy levels within the forbidden zone between the conduction and valence bands. Incident radiation excites electrons from the valence to conduction band from where they decay to the meta-stable newly created energy level in the forbidden zone. From there, electrons return to the valence band, accompanied by the emission of radiation of lower frequency than that of the incident radiation. Optical frequency down-conversion is thus efficiently and rapidly accomplished. In a further embodiment of the present invention said grating is formed on the entrance and exit surfaces of one or more layers of a single or multi-junction solar cell. In this embodiment said grating is characterized by indents of depth λ/4 and width >λ, where λ is the wavelength of solar radiation incident on the layer under consideration.
    • 公开了选择性光吸收半导体表面。 所述半导体表面的特征在于存在包括尺寸的光栅的凹陷或突起,以增强所选择的辐射频率的吸收。 在本发明的优选实施例中,为了进行光频率下变换,所述光栅形成在掺杂半导体的表面上。 半导体被掺杂以便在导电带和价带之间的禁区内产生能级。 入射辐射激发电子从价态衰减到禁带的元稳定新创能量的价带到导带。 从那里,电子返回价带,伴随着辐射频率低于入射辐射的辐射。 因此,光频率下变换被有效且快速地实现。 在本发明的另一实施例中,所述光栅形成在单结或多结太阳能电池的一层或多层的入射表面和出射表面上。 在该实施例中,所述光栅的特征在于深度为λ/ 4和宽度>λ,其中λ是入射在所考虑的层上的太阳辐射的波长。
    • 6. 发明授权
    • Selective light absorbing semiconductor surface
    • 选择性光吸收半导体表面
    • US08227885B2
    • 2012-07-24
    • US11825558
    • 2007-07-05
    • Avto TavkhelidzeAmiran BibilashviliZaza Taliashvili
    • Avto TavkhelidzeAmiran BibilashviliZaza Taliashvili
    • H01L33/50
    • H01L31/055H01L31/02363Y02E10/52
    • A selective light absorbing semiconductor surface is disclosed. Said semiconductor surface is characterized by the presence of indentations or protrusions comprising a grating of dimensions such as to enhance the absorption of selected frequencies of radiation. In a preferred embodiment of the present invention, said grating is formed on the surface of a doped semiconductor for the purposes of optical frequency down conversion. The semiconductor is doped so as to create energy levels within the forbidden zone between the conduction and valence bands. Incident radiation excites electrons from the valence to conduction band from where they decay to the meta-stable newly created energy level in the forbidden zone. From there, electrons return to the valence band, accompanied by the emission of radiation of lower frequency than that of the incident radiation. Optical frequency down-conversion is thus efficiently and rapidly accomplished. In a further embodiment of the present invention said grating is formed on the entrance and exit surfaces of one or more layers of a single or multi-junction solar cell. In this embodiment said grating is characterized by indents of depth λ/4 and width >λ, where λ is the wavelength of solar radiation incident on the layer under consideration.
    • 公开了选择性光吸收半导体表面。 所述半导体表面的特征在于存在包括尺寸的光栅的凹陷或突起,以增强所选择的辐射频率的吸收。 在本发明的优选实施例中,为了进行光频率下变换,所述光栅形成在掺杂半导体的表面上。 半导体被掺杂以便在导电带和价带之间的禁区内产生能级。 入射辐射激发电子从价态衰减到禁带的元稳定新创能量的价带到导带。 从那里,电子返回价带,伴随着辐射频率低于入射辐射的辐射。 因此,光频率下变换被有效且快速地实现。 在本发明的另一实施例中,所述光栅形成在单结或多结太阳能电池的一层或多层的入射表面和出射表面上。 在该实施例中,所述光栅的特征在于深度λ/ 4和宽度>λ,其中λ是入射在所考虑的层上的太阳辐射的波长。