Patents by Inventor Barry Rand

Barry Rand has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20090308456
    Abstract: The present disclosure relates to the field of organic optoelectronics. More particularly, the present disclosure relates to photovoltaic structures and to methods to produce the same. One aspect of the disclosure is a photovoltaic structure comprising: an electron acceptor material, and an electron donor material, wherein the electron donor material comprises: a host material, and a guest material, wherein the energy of the lowest excited singlet state of the guest is smaller than the energy of lowest excited singlet state of the host, wherein the fluorescence emission spectrum of the host overlaps with at least part of the absorption spectrum of the guest and wherein the energy of the lowest excited triplet state of the guest is larger than the energy of the lowest excited triplet state of the host.
    Type: Application
    Filed: November 14, 2008
    Publication date: December 17, 2009
    Applicant: Interuniversitair Microelektronica Centrum (IMEC)
    Inventors: Barry Rand, Jan Genoe, Paul Heremans
  • Publication number: 20080001144
    Abstract: A photosensitive cell includes an anode and a cathode; a donor-type organic material and an acceptor-type organic material forming a donor-acceptor junction connected between the anode and the cathode; and an exciton blocking layer connected between the acceptor-type organic material of the donor-acceptor junction and the cathode, the blocking layer consisting essentially of a material that has a hole mobility of at least 10?7 cm2/V-sec or higher, where a HOMO of the blocking layer is higher than or equal to a HOMO of the acceptor-type material.
    Type: Application
    Filed: June 6, 2007
    Publication date: January 3, 2008
    Inventors: Barry Rand, Stephen Forrest, Mark Thompson
  • Publication number: 20070272918
    Abstract: An organic photosensitive optoelectronic device, having a donor-acceptor heterojunction of a donor-like material and an acceptor-like material and methods of making such devices is provided. At least one of the donor-like material and the acceptor-like material includes a subphthalocyanine, a subporphyrin, and/or a subporphyrazine compound; and/or the device optionally has at least one of a blocking layer or a charge transport layer, where the blocking layer and/or the charge transport layer includes a subphthalocyanine, a subporphyrin, and/or a subporphyrazine compound.
    Type: Application
    Filed: May 25, 2006
    Publication date: November 29, 2007
    Inventors: Barry Rand, Stephen Forrest, Kristin Mutolo, Elizabeth Mayo, Mark Thompson
  • Publication number: 20070215868
    Abstract: A photosensitive device includes a plurality of organic photoconductive materials disposed in a stack between a first electrode and a second electrode, including a first continuous layer of donor host material, a second continuous layer of acceptor host material, and at least one other organic photoconductive material disposed as a plurality of discontinuous islands between the first continuous layer and the second continuous layer. Each of these other photoconductive materials has an absorption spectra different from the donor host material and the acceptor host material. Preferably, each of the discontinuous islands consists essentially of a crystallite of the respective organic photoconductive material, and more preferably, the crystallites are nanocrystals.
    Type: Application
    Filed: December 1, 2006
    Publication date: September 20, 2007
    Inventors: Stephen Forrest, Fan Yang, Barry Rand
  • Publication number: 20070176165
    Abstract: The present invention is directed to organic photosensitive optoelectronic devices and methods of use for determining the position of a light source. Provided is an organic position sensitive detector (OPSD) comprising: a first electrode, which is resistive and may be either an anode or a cathode; a first contact in electrical contact with the first electrode; a second contact in electrical contact with the first electrode; a second electrode disposed near the first electrode; a donor semiconductive organic layer disposed between the first electrode and the second electrode; and an acceptor semiconductive organic layer disposed between the first electrode and the second electrode and adjacent to the donor semiconductive organic layer. A hetero-junction is located between the donor layer and the acceptor layer, and at least one of the donor layer and the acceptor layer is light absorbing.
    Type: Application
    Filed: September 1, 2005
    Publication date: August 2, 2007
    Inventors: Stephen Forrest, Barry Rand, Michael Lange
  • Publication number: 20070096085
    Abstract: A photosensitive device includes a series of organic photoactive layers disposed between two electrodes. Each layer in the series is in direct contact with a next layer in the series. The series is arranged to form at least one donor-acceptor heterojunction, and includes a first organic photoactive layer comprising a first host material serving as a donor, a thin second organic photoactive layer comprising a second host material disposed between the first and a third organic photoactive layer, and the third organic photoactive layer comprising a third host material serving as an acceptor. The first, second, and third host materials are different. The thin second layer serves as an acceptor relative to the first layer or as a donor relative to the third layer.
    Type: Application
    Filed: November 2, 2005
    Publication date: May 3, 2007
    Inventors: Barry Rand, Stephen Forrest
  • Publication number: 20060278944
    Abstract: A photosensitive cell includes an anode and a cathode; a donor-type organic material and an acceptor-type organic material forming a donor-acceptor junction connected between the anode and the cathode; and an exciton blocking layer connected between the acceptor-type organic material of the donor-acceptor junction and the cathode, the blocking layer consisting essentially of a material that has a hole mobility of at least 10?7 cm2NV-sec or higher, where a HOMO of the blocking layer is higher than or equal to a HOMO of the acceptor-type material.
    Type: Application
    Filed: June 13, 2005
    Publication date: December 14, 2006
    Inventors: Barry Rand, Stephen Forrest, Mark Thompson
  • Publication number: 20060138453
    Abstract: An organic photosensitive optoelectronic device, having an anode, a cathode, and an organic blocking layer between the anode and the cathode is described, wherein the blocking layer comprises a phenanthroline derivative, and at least partially blocks at least one of excitons, electrons, and holes.
    Type: Application
    Filed: November 22, 2005
    Publication date: June 29, 2006
    Inventors: Mark Thompson, Jian Li, Stephen Forrest, Barry Rand
  • Publication number: 20060032529
    Abstract: The present invention generally relates to organic photosensitive optoelectronic devices. More specifically, it is directed to organic photosensitive optoelectronic devices having a photoactive organic region containing encapsulated nanoparticles that exhibit plasmon resonances. An enhancement of the incident optical field is achieved via surface plasmon polariton resonances. This enhancement increases the absorption of incident light, leading to a more efficient device.
    Type: Application
    Filed: August 11, 2004
    Publication date: February 16, 2006
    Inventors: Barry Rand, Stephen Forrest
  • Publication number: 20060027802
    Abstract: A device is provided having a first electrode, a second electrode, a first photoactive region having a characteristic absorption wavelength ?1 and a second photoactive region having a characteristic absorption wavelength ?2. The photoactive regions are disposed between the first and second electrodes, and further positioned on the same side of a reflective layer, such that the first photoactive region is closer to the reflective layer than the second photoactive region. The materials comprising the photoactive regions may be selected such that ?1 is at least about 10% different from ?2. The device may further comprise an exciton blocking layer disposed adjacent to and in direct contact with the organic acceptor material of each photoactive region, wherein the LUMO of each exciton blocking layer other than that closest to the cathode is not more than about 0.3 eV greater than the LUMO of the acceptor material.
    Type: Application
    Filed: November 3, 2004
    Publication date: February 9, 2006
    Inventors: Stephen Forrest, Jiangeng Xue, Soichi Uchida, Barry Rand
  • Publication number: 20060027834
    Abstract: A device is provided having a first electrode, a second electrode, a first photoactive region having a characteristic absorption wavelength ?1 and a second photoactive region having a characteristic absorption wavelength ?2. The photoactive regions are disposed between the first and second electrodes, and further positioned on the same side of a reflective layer, such that the first photoactive region is closer to the reflective layer than the second photoactive region. The materials comprising the photoactive regions may be selected such that ?1 is at least about 10% different from ?2. The device may further comprise an exciton blocking layer disposed adjacent to and in direct contact with the organic acceptor material of each photoactive region, wherein the LUMO of each exciton blocking layer other than that closest to the cathode is not more than about 0.3 eV greater than the LUMO of the acceptor material.
    Type: Application
    Filed: August 5, 2004
    Publication date: February 9, 2006
    Inventors: Stephen Forrest, Jiangeng Xue, Soichi Uchida, Barry Rand
  • Publication number: 20060027801
    Abstract: A device is provided having a first electrode, a second electrode, a first photoactive region having a characteristic absorption wavelength ?1 and a second photoactive region having a characteristic absorption wavelength ?2. The photoactive regions are disposed between the first and second electrodes, and further positioned on the same side of a reflective layer, such that the first photoactive region is closer to the reflective layer than the second photoactive region. The materials comprising the photoactive regions may be selected such that ?1 is at least about 10% different from ?2. The device may further comprise an exciton blocking layer disposed adjacent to and in direct contact with the organic acceptor material of each photoactive region, wherein the LUMO of each exciton blocking layer other than that closest to the cathode is not more than about 0.3 eV greater than the LUMO of the acceptor material.
    Type: Application
    Filed: August 5, 2004
    Publication date: February 9, 2006
    Inventors: Stephen Forrest, Jiangeng Xue, Soichi Uchida, Barry Rand
  • Publication number: 20050224905
    Abstract: A device is provided, having a first electrode, a second electrode, and a photoactive region disposed between the first electrode and the second electrode. The photoactive region includes a first organic layer comprising a mixture of an organic acceptor material and an organic donor material, wherein the first organic layer has a thickness not greater than 0.8 characteristic transport lengths, and a second organic layer in direct contact with the first organic layer, wherein: the second organic layer comprises an unmixed layer of the organic acceptor material or the organic donor material of the first organic layer, and the second organic layer has a thickness not less than about 0.1 optical absorption lengths. Preferably, the first organic layer has a thickness not greater than 0.3 characteristic transport lengths. Preferably, the second organic layer has a thickness of not less than about 0.2 optical absorption lengths.
    Type: Application
    Filed: April 13, 2004
    Publication date: October 13, 2005
    Inventors: Stephen Forrest, Soichi Uchida, Barry Rand, Jiangeng Xue
  • Publication number: 20050224113
    Abstract: A device is provided, having a first electrode, a second electrode, and a photoactive region disposed between the first electrode and the second electrode. The photoactive region includes a first organic layer comprising a mixture of an organic acceptor material and an organic donor material, wherein the first organic layer has a thickness not greater than 0.8 characteristic charge transport lengths, and a second organic layer in direct contact with the first organic layer, wherein: the second organic layer comprises an unmixed layer of the organic acceptor material or the organic donor material of the first organic layer, and the second organic layer has a thickness not less than about 0.1 optical absorption lengths. Preferably, the first organic layer has a thickness not greater than 0.3 characteristic charge transport lengths. Preferably, the second organic layer has a thickness of not less than about 0.2 optical absorption lengths.
    Type: Application
    Filed: August 4, 2004
    Publication date: October 13, 2005
    Inventors: Jiangeng Xue, Soichi Uchida, Barry Rand, Stephen Forrest