Jeramy David Zimmerman

US Patent:

8017863, Sep 13, 2011

Filed:

Apr 7, 2009

Appl. No.:

12/419846

Inventors:

Stephen R. Forrest - Ann Arbor MI, US
Michael S. Arnold - Madison WI, US
Jeramy D. Zimmerman - Ann Arbor MI, US
Richard Lunt - Ann Arbor MI, US

Assignee:

The Regents of the University of Michigan - Ann Arbor MI

International Classification:

H01L 31/00

US Classification:

136263

Abstract:

A photoactive device includes a photoactive region disposed between and electrically connected to two electrodes where the photoactive region includes a first organic photoactive layer comprising a first donor material and a second organic photoactive layer comprising a first acceptor material. The first donor material contains photoactive polymer-wrapped carbon nanotubes and the photoactive region includes one or more additional organic photoactive material layers disposed between the first donor material layer and the acceptor material layer. The photoactive region creates excitons upon absorption of light in the range of about 400 nm to 1450 nm.

US Patent:

8378385, Feb 19, 2013

Filed:

Sep 9, 2010

Appl. No.:

12/878261

Inventors:

Stephen R. Forrest - Ann Arbor MI, US
Jeramy Zimmerman - Ann Arbor MI, US
Kyusang Lee - Ann Arbor MI, US

Assignee:

The Regents of the University of Michigan - Ann Arbor MI

International Classification:

H01L 29/06
H01L 21/302
H01L 31/0352

US Classification:

257190, 257614, 257 80, 257E21124, 257E31032, 438749, 438703, 438 94

Abstract:

There is disclosed methods of making photosensitive devices, such as flexible photovoltaic (PV) devices, through the use of epitaxial liftoff. Also described herein are methods of preparing flexible PV devices comprising a structure having a growth substrate, wherein the selective etching of protective layers yields a smooth growth substrate that us suitable for reuse.

US Patent:

20070227588, Oct 4, 2007

Filed:

Feb 15, 2007

Appl. No.:

11/675269

Inventors:

Arthur Gossard - Santa Barbara CA, US
Joshua Zide - Goleta CA, US
Jeramy Zimmerman - Santa Barbara CA, US

Assignee:

THE REGENTS OF THE UNIVERSITY OF CALIFORNIA - Oakland CA

International Classification:

H01L 31/00

US Classification:

136255000

Abstract:

A method and device that incorporates metallic nanoparticles at the p-n tunnel junction in a cascaded photovoltaic solar cell. The use of the nanoparticles enhances the tunneling current density through the tunnel junction. As such, the efficiency of the solar cell is increased. A method in accordance with the present invention comprises making a first solar cell having a first bandgap, making a tunnel junction coupled to the first solar cell, and making a second solar cell having a second bandgap, coupled to the tunnel junction opposite the first solar cell, wherein the tunnel junction comprises nanoparticles. Such a method further optionally includes the nanoparticles being a metal or a semi metal, specifically a semi-metal of erbium arsenide, the nanoparticles being deposited in an island structure within the tunnel junction, and the first solar cell being deposited on a flexible substrate. A device in accordance with the present invention comprises a tunnel junction, wherein the tunnel junction comprises nanoparticles between the n+ layer and the p+ layer of the tunnel junction. Such a device further optionally includes the device being a cascaded solar cell, the nanoparticles are a metal or semi-metal, specifically a semi-metal of erbium arsenide, and the device is fabricated on a flexible substrate.

US Patent:

20100065829, Mar 18, 2010

Filed:

Jan 9, 2009

Appl. No.:

12/351378

Inventors:

Stephen R. Forrest - Ann Arbor MI, US
Michael S. Arnold - Ann Arbor MI, US
Jeramy D. Zimmerman - Ann Arbor MI, US

Assignee:

The Regents of the University of Michigan - Ann Arbor MI

International Classification:

H01L 51/42

US Classification:

257 40, 977742, 257E51014

Abstract:

A photovoltaic device includes a photoactive region disposed between and electrically connected to two electrodes where the photoactive region includes photoactive polymer-wrapped carbon nanotubes that create excitons upon absorption of light in the range of about 400 nm to 1400 nm.

US Patent:

20110168984, Jul 14, 2011

Filed:

Aug 25, 2010

Appl. No.:

12/868503

Inventors:

Stephen R. Forrest - Ann Arbor MI, US
Jeramy D. Zimmerman - Ann Arbor MI, US
Mark E. Thompson - Anaheim Hills CA, US
Viacheslav Diev - Los Angeles CA, US
Kenneth Hanson - Carrboro NC, US

Assignee:

The Regents of the University of Michigan - Ann Arbor MI
The University of Southern California - Los Angeles CA

International Classification:

H01L 51/46
C07D 487/22

US Classification:

257 40, 540145, 534 11, 534 14, 534 15, 257E51043

Abstract:

Porphyrin compounds are provided. The compounds may further comprise a fused polycyclic aromatic hydrocarbon or a fused heterocyclic aromatic. Fused polycyclic aromatic hydrocarbon s and fused heterocyclic aromatics may extend and broaden absorption, and modify the solubility, crystallinity, and film-forming properties of the porphyrin compounds. Additionally, devices comprising porphyrin compounds are also provided. The porphyrin compounds may be used in a donor/acceptor configuration with compounds, such as C.

US Patent:

20120177560, Jul 12, 2012

Filed:

Jun 3, 2011

Appl. No.:

13/153382

Inventors:

Stephen R. Forrest - Ann Arbor MI, US
Jeramy D. Zimmerman - Ann Arbor MI, US

Assignee:

THE REGENTS OF THE UNIVERSITY OF MICHIGAN - Ann Arbor

International Classification:

D01F 9/12
B82Y 40/00
B82Y 30/00

US Classification:

4234471, 23293 R, 977742, 977845

Abstract:

A method of processing bundles of carbon nanotubes (CNTs). Bundles of CNTs are put into a solution and unbundled using sonication and one or more surfactants that break apart and disperse at least some of the bundles into the solution such that it contains individual semiconducting CNTs, individual metallic CNTs, and remaining CNT bundles. The individual CNTs are separated from each other using agarose bead column separation using sodium dodecyl sulfate as a surfactant. Remaining CNT bundles are then separated out by performing density-gradient ultracentrifugation.

US Patent:

20130001731, Jan 3, 2013

Filed:

Jun 28, 2012

Appl. No.:

13/536003

Inventors:

Stephen Forrest - Ann Arbor MI, US
Jeramy D. Zimmerman - Ann Arbor MI, US
Xin Xu - West Windsor NJ, US
Christopher Kyle Renshaw - Ann Arbor MI, US

Assignee:

THE REGENTS OF THE UNIVERSITY OF MICHIGAN - Ann Arbor MI

International Classification:

H01L 31/18
H01L 27/144

US Classification:

257443, 438 64, 257E3111, 257E27128

Abstract:

A method of fabricating an optoelectronic device includes creating an optoelectronic structure on a first substrate. The optoelectronic structure includes a release layer and a plurality of inorganic semiconductor layers supported by the release layer. The plurality of inorganic semiconductor layers is configured to be active in operation of the optoelectronic device. The plurality of inorganic semiconductor layers are permanently attached to a second substrate, which is flexible. The plurality of inorganic semiconductor layers are released from the first substrate after the attaching step, and the second substrate is deformed to a non-planar configuration.

US Patent:

20130043214, Feb 21, 2013

Filed:

Jun 28, 2012

Appl. No.:

13/536267

Inventors:

Stephen R. Forrest - Ann Arbor MI, US
Jeramy Zimmerman - Ann Arbor MI, US
Kyusang Lee - Ann Arbor MI, US

International Classification:

B32B 15/04
B44C 1/22

US Classification:

216 95, 428457

Abstract:

There is disclosed a growth structure comprising a growth substrate, a sacrificial layer, a buffer layer, at least three substrate protective layers, at least one epilayer, at least one contact, and a metal or alloy-coated host substrate. In one embodiment, the device further comprises at least three device structure protecting layers. The sacrificial layer may be positioned between the growth substrate and the at least one epilayer, wherein the at least three substrate protective layers are positioned between the growth substrate and the sacrificial layer, and the at least three device structure protecting layers are positioned between the sacrificial layer and the epilayer. There is also disclosed a method of preserving the integrity of a growth substrate by releasing the cell structure by etching the sacrificial layer and the protective layers.