Patents by Inventor Letian Dou

Letian Dou 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: 20220246865
    Abstract: The present disclosure relates to novel perovskite solar cells, and the method of making and using the novel perovskite solar cells. More specifically, a triple cation perovskite solar cell device containing a multifunctional capping layer (MCL) of R1NH3+ and/or a thin layer of two-dimensional (2D) material of (R1NH3+)2(A+)n?1(M2+)n(X?)3n+1 on top of the commonly used ABX3 perovskite, with enhanced power conversion efficiency of 22.06% (from 19.94%) with long-term stability over 1000 hours under continuous illumination has been developed.
    Type: Application
    Filed: January 28, 2022
    Publication date: August 4, 2022
    Applicant: Purdue Research Foundation
    Inventors: Letian Dou, Ke Ma
  • Publication number: 20210343948
    Abstract: The present disclosure relates to novel two-dimensional halide perovskite materials, and the method of making and using the two-dimensional halide perovskite materials.
    Type: Application
    Filed: September 4, 2020
    Publication date: November 4, 2021
    Applicant: Purdue Research Foundation
    Inventors: Letian Dou, Yao Gao, Enzheng Shi
  • Patent number: 10858581
    Abstract: This disclosure provides systems, methods, and apparatus related to heterojunctions in halide perovskite nanostructures. In one aspect, a nanostructure comprises a first region and a second region. The first region comprises ABX3, with A being selected from a group consisting of Cs and Rb, with B being selected from a group consisting of Sn and Pb, and with X being selected from a group consisting of Br, Cl, and Br and Cl. The second region comprises ABY3, with Y being selected from a group consisting of Br, I, and Br and I. Compositions of the first region of the nanostructure and the second region of the nanostructure are different.
    Type: Grant
    Filed: October 9, 2017
    Date of Patent: December 8, 2020
    Assignee: The Regents of the University of California
    Inventors: Letian Dou, Minliang Lai, Yiming Yang, Peidong Yang
  • Publication number: 20200269323
    Abstract: Provided are methods for synthesizing metal nanowires in solution using an organic reducing agent. A reaction mixture can be provided in solution with a metal salt, the organic reducing agent, and a solvent, where the solvent includes a surface ligand or consists of a surface ligand. The organic reducing agent, such as benzoin, can be decomposed in the reaction mixture to form organic free radicals that reduce metal ions of the metal salt into metal. The surface ligand of the solvent can coordinate with the metal in a manner so that metal nanowires are formed in solution. The diameter and morphology of the nanowires, reaction speed, reaction yield, and other features may be tunable by adjusting parameters such as reaction temperature and chemistry of the reducing agent.
    Type: Application
    Filed: May 23, 2017
    Publication date: August 27, 2020
    Applicants: The Regents of the University of California, The Regents of the University of California
    Inventors: Peidong Yang, Fan Cui, Letian Dou, Zhiqiang Niu
  • Patent number: 10618889
    Abstract: The present disclosure relates to novel thiophene monoamine based organic-inorganic hybrid perovskites, and the method of making and using the novel organic-inorganic hybrid perovskites.
    Type: Grant
    Filed: July 8, 2019
    Date of Patent: April 14, 2020
    Assignee: Purdue Research Foundation
    Inventors: Letian Dou, Yao Gao
  • Publication number: 20200062740
    Abstract: The present disclosure relates to novel thiophene monoamine based organic-inorganic hybrid perovskites, and the method of making and using the novel organic-inorganic hybrid perovskites.
    Type: Application
    Filed: July 8, 2019
    Publication date: February 27, 2020
    Applicant: Purdue Research Foundation
    Inventors: Letian Dou, Yao Gao
  • Publication number: 20180247722
    Abstract: The disclosure provides for transparent conductors comprised of metal-reduced graphene oxide or graphene core-shell nanowires, process of preparation thereof, and methods of use thereof.
    Type: Application
    Filed: September 15, 2016
    Publication date: August 30, 2018
    Inventors: Peidong Yang, Letian Dou, Fan Cui
  • Patent number: 10026899
    Abstract: Tandem electro-optic devices and active materials for electro-optic devices are disclosed. Tandem devices include p-type and n-type layers between the active layers, which are doped to achieve carrier tunneling. Low bandgap conjugated polymers are also disclosed.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: July 17, 2018
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Yang Yang, Letian Dou, Jing-Bi You
  • Publication number: 20180105743
    Abstract: This disclosure provides systems, methods, and apparatus related to heterojunctions in halide perovskite nanostructures. In one aspect, a nanostructure comprises a first region and a second region. The first region comprises ABX3, with A being selected from a group consisting of Cs and Rb, with B being selected from a group consisting of Sn and Pb, and with X being selected from a group consisting of Br, Cl, and Br and Cl. The second region comprises ABY3, with Y being selected from a group consisting of Br, I, and Br and I. Compositions of the first region of the nanostructure and the second region of the nanostructure are different.
    Type: Application
    Filed: October 9, 2017
    Publication date: April 19, 2018
    Applicant: The Regents of the University of California
    Inventors: Letian Dou, Minliang Lai, Yiming Yang, Peidong Yang
  • Publication number: 20170217785
    Abstract: This disclosure provides systems, methods, and apparatus related to inorganic halide perovskite nanowires. In one aspect, a first solution comprising cesium oleate or rubidium oleate in a first organic solvent is provided. A second solution comprising a lead halide and a surfactant in a second organic solvent is provided. The halide is selected from a group consisting of chlorine, bromine, and iodine. The first solution and the second solution are mixed. A reaction between the cesium oleate or the rubidium oleate and the lead halide forms a plurality of nanowires comprising an inorganic lead halide perovskite.
    Type: Application
    Filed: February 1, 2017
    Publication date: August 3, 2017
    Applicant: The Regents of the University of California
    Inventors: Peidong Yang, Letian Dou, Dandan Zhang, Minliang Lai, Andrew B. Wong
  • Patent number: 9663611
    Abstract: A conjugated polymer for electronic devices can include a repeated unit having the structure of formula (I)
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: May 30, 2017
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Yang Yang, Letian Dou, Wei-Hsuan Chang
  • Publication number: 20170062723
    Abstract: Tandem electro-optic devices and active materials for electro-optic devices are disclosed. Tandem devices include p-type and n-type layers between the active layers, which are doped to achieve carrier tunneling. Low bandgap conjugated polymers are also disclosed.
    Type: Application
    Filed: August 16, 2016
    Publication date: March 2, 2017
    Applicant: The Regents of the University of California
    Inventors: Yang YANG, Letian DOU, Jing-Bi YOU
  • Patent number: 9425420
    Abstract: Tandem electro-optic devices and active materials for electro-optic devices are disclosed. Tandem devices include p-type and n-type layers between the active layers, which are doped to achieve carrier tunneling. Low bandgap conjugated polymers are also disclosed.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: August 23, 2016
    Assignee: The Regents of the University of California
    Inventors: Yang Yang, Letian Dou, Jing-Bi You
  • Publication number: 20150287873
    Abstract: An electro-optic device includes a first electrode, an active layer formed over and electrically connected with the first electrode, a buffer layer formed over and electrically connected with the active layer, and a second electrode formed directly on the buffer layer. The second electrode includes a plurality of nanowires interconnected into a network of nanowires. The buffer layer provides a physical barrier between the active layer and the plurality of nanowires to prevent damage to the active layer while the second electrode is formed.
    Type: Application
    Filed: February 12, 2015
    Publication date: October 8, 2015
    Inventors: Yang Yang, Rui Zhu, Chun C. Chen, Letian Dou, Gang Li
  • Patent number: 8993998
    Abstract: An electro-optic device includes a first electrode, an active layer formed over and electrically connected with the first electrode, a buffer layer formed over and electrically connected with the active layer, and a second electrode formed directly on the buffer layer. The second electrode includes a plurality of nanowires interconnected into a network of nanowires. The buffer layer provides a physical barrier between the active layer and the plurality of nanowires to prevent damage to the active layer while the second electrode is formed.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 31, 2015
    Assignee: The Regents of the University of California
    Inventors: Yang Yang, Rui Zhu, Chun Chao Chen, Letian Dou, Gang Li
  • Publication number: 20150028265
    Abstract: A conjugated polymer for electronic devices can include a repeated unit having the structure of formula (I)
    Type: Application
    Filed: July 23, 2014
    Publication date: January 29, 2015
    Inventors: Yang Yang, Letian Dou, Wei-Hsuan Chang
  • Publication number: 20140020739
    Abstract: Tandem electro-optic devices and active materials for electro-optic devices are disclosed. Tandem devices include p-type and n-type layers between the active layers, which are doped to achieve carrier tunneling. Low bandgap conjugated polymers are also disclosed.
    Type: Application
    Filed: March 29, 2012
    Publication date: January 23, 2014
    Applicant: The Regents of The University of California
    Inventors: Yang Yang, Letian Dou, Jing-Bi You