Organic photosensitive optoelectronic devices

A photoelectric device and device technology, applied in the field of organic photosensitive optoelectronic devices, can solve the problems of increased light absorption and inability to harvest incident light

Inactive Publication Date: 2012-08-01
UNIVERSITY OF WARWICK
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AI-Extracted Technical Summary

Problems solved by technology

In this type of tandem cell, each subcell is too thin to harvest all the incident light in the wavelength range...
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Abstract

A photosensitive optoelectronic device (1) comprises a plurality of organic semiconductor sub-cells (10, 11, 12, 13) arranged in a stack between electrodes (3, 5), each sub-cell comprising donor material (14, 16, 23, 25) and acceptor material (15, 17, 24, 26) providing a heterojunction. There is a recombination layer (19, 22, 28) between adjacent sub-cells. The sub-cells are arranged in two groups (20, 29). The sub-cells (10, 11; 12, 13) within a group (20; 29) are responsive over substantially the same part of the light spectrum. The groups (20, 29) differ substantially from each other in respect of the parts of the light spectrum over which their respective sub-cells are responsive.

Application Domain

NanoinformaticsSolid-state devices +1

Technology Topic

Organic semiconductorLight spectrum +3

Image

  • Organic photosensitive optoelectronic devices
  • Organic photosensitive optoelectronic devices
  • Organic photosensitive optoelectronic devices

Examples

  • Experimental program(1)

Example Embodiment

[0036] figure 1 Shown as figure 2 , 4 and 5 show the legend of the layer. Fullerene C 60 Used as a receptor layer. Chloro-aluminium phthalocyanine and subphthalocyanine are used as the donor layer. Molybdenum oxide is used as a separator between the anode and the donor layer of the sub-cell. Bath copper spirit (BCP) is used as an exciton blocking layer. The composite layer may be formed in the form of a semi-transparent thin metal layer of silver, aluminum or titanium, or may be such as indium tin oxide (ITO), indium tin zinc oxide (zinc indium tin oxide) or indium tin gallium oxide (gallium indium tin oxide). ) And other conductive oxide transparent layers, or discontinuous recombination centers can be provided. The transparent electrode may be a transparent layer of conductive oxide, such as indium tin oxide (ITO), indium tin zinc oxide or indium tin gallium oxide. The translucent electrode may be a thin metal layer of silver, aluminum or titanium.
[0037] figure 1 An organic semiconductor photovoltaic device 1 according to the present invention is shown. The device includes a transparent substrate 2 provided at one end to receive light L, on which a semi-transparent electrode 3 serves as an anode in the structure. Above this is a thin spacer 4 of molybdenum oxide approximately 5 nanometers thick. At the other end of the device is a reflective aluminum electrode 5, which serves as the cathode in the device. The conductor 6 is connected to the anode 3 and terminates at the connector 7 and the conductor 8 is connected to the cathode 5 and terminates at the connector 9. In use, the load will be placed between connectors 7 and 9.
[0038] Between the anode 3 and the cathode 5 is a stack of 4 organic semiconductor sub-cells 10, 11, 12 and 13. Each sub-cell includes donor and acceptor layers. The sub-cell 10 has a donor layer 14 of subphthalocyanine and fullerene C 60 The receptor layer 15. The adjacent cell 11 also has a donor layer 16 of subphthalocyanine and fullerene C 60 The receptor layer 17. Between the sub-cells 10 and 11 are the BCP exciton blocking layer 18 and the composite layer 19. In this embodiment, the neutron cells 10 and 11 have substantially the same response characteristics in the green and yellow parts of the spectrum, and form the first group 20.
[0039] There is a BCP exciton blocking layer 21 and a composite layer 22 between the sub-cell 11 and the sub-cell 12.
[0040] The sub-cell 12 has a donor layer 23 of aluminum phthalocyanine chloride and fullerene C 60 The receptor layer 24. The adjacent cell 13 also has a donor layer 25 of aluminum phthalocyanine chloride and fullerene C 60 The receptor layer 26. Between the sub-cells 12 and 13 are the BCP exciton blocking layer 27 and the composite layer 28. The sub-cells 12 and 13 have substantially the same response characteristics in the red part of the frequency spectrum in this embodiment, and form a second group 29. Between the acceptor layer 26 and the aluminum electrode 5 is an exciton blocking layer 30 of BCP.
[0041] In this structure, the sub-cells 10, 11, 12 and 13 are arranged in series between the anode 3 and the cathode 5, such as image 3 Shown in.
[0042] Figure 4 The device 31 modified according to the present embodiment is shown in which the transparent electrode 3 has been removed, and the transparent ITO substrate 32 as the anode has replaced the transparent substrate 2.
[0043] Figure 5 Another embodiment of the organic semiconductor photovoltaic device 33 is shown. The device 33 includes a transparent substrate 34 provided at one end to receive light L, and a semitransparent electrode 35 as an anode of this structure is provided thereon. An interlayer 36 of molybdenum oxide is provided on this. The other end of the device is a reflective aluminum electrode 37, which also serves as the anode of this device and is connected to electrode 35 by a conductor 38. The conductor 38 terminates at the connector 39.
[0044] Between the anodes 35 plus 37 is a stack of 4 organic semiconductor sub-cells 40, 41, 42 and 43. Each sub-cell includes donor and acceptor layers. The sub-cell 40 has a donor layer 44 of subphthalocyanine and fullerene C 60 The receptor layer 45. The adjacent sub-cell 41 also has a donor layer 46 of subphthalocyanine and fullerene C 60 The receptor layer 47. Between the sub-cells 40 and 41 are the BCP exciton blocking layer 48 and the composite layer 49. In this embodiment, the sub-cells 40 and 41 have substantially the same response characteristics in the green and yellow parts of the spectrum, and form the first group 50.
[0045] Between the sub-cell 41 and the sub-cell 42 there is a BCP exciton blocking layer 51 and a translucent electrode 52 serving as a cathode in this structure. The conductor 53 leads from the electrode 52 and terminates at the connector 54. In use, the load will be set between connectors 39 and 54.
[0046] The organic semiconductor layers of the sub-cells 42 and 43 are reversed from those in the sub-cells 12 and 13, for example, the aluminum electrode 37 is now the anode and the cathode is the electrode 52. In this case, the molybdenum oxide layer near the aluminum electrode can, for example, be replaced with tungsten trioxide (WO 3 ) Or vanadium oxide (V 2 O 5 ) Thin layer.
[0047] The sub-cell 42 has a donor layer 55 of aluminum phthalocyanine chloride and fullerene C 60 The receptor layer 56. The adjacent sub-cell 43 also has a donor layer 57 of aluminum phthalocyanine chloride and fullerene C 60 The receptor layer 58. Between the sub-cells 42 and 43 are the BCP exciton blocking layer 59 and the composite layer 60. In this embodiment, the sub-cells 42 and 43 have substantially the same response characteristics in the red part of the spectrum, and form the second group 61. Between the acceptor layer 56 and the electrode 52 is an exciton blocking layer 62 of BCP.
[0048] In this structure, the sub-cells 40 and 41 of the first group 50 are arranged in series, and the sub-cells 42 and 43 of the second group 61 are arranged in series. However, as Image 6 As shown, the first and second groups are arranged in parallel.
[0049] In the embodiment described above, each sub-cell has a thickness less than the light absorption length. The thickness of individual sub-cells is too small so that the sub-cells cannot absorb all incident light in the wavelength range that the sub-cells can respond to.
[0050] Therefore, an organic photosensitive device that operates over a broad spectrum with improved efficiency is provided.
[0051] It should be appreciated that the described embodiments are for example and to clarify the main features of the present invention. Modifications can be made to these embodiments without departing from the scope of the invention.

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