Method of making an organic thin film transistor

Patent metadata

Field	Value
Publication number	US-2017092859-A1
Application number	US-201615375251-A
Country	US
Kind code	A1
Filing date	Dec 12, 2016
Priority date	Sep 24, 2012
Publication date	Mar 30, 2017
Grant date	—

Abstract

In one aspect, organic thin film transistors are described herein. In some embodiments, an organic thin film transistor comprises a source terminal, a drain terminal and a gate terminal; a dielectric layer positioned between the gate terminal and the source and drain terminals; and a vibrationally-assisted drop-cast organic film comprising small molecule semiconductor in electrical communication with the source terminal and drain terminal, wherein the transistor has a carrier mobility (μ eff ) of at least about 1 cm 2 /V·s.

First claim

1 . A method of making a photovoltaic device comprising:
providing a first electrode; drop-casting a photosensitive organic film over the first electrode from a solution comprising a donor small molecule phase, wherein the deposited solution is vibrated during evaporation of solution solvent; and depositing a second electrode over the photosensitive organic film.

2 . The method of claim 1 , wherein the at least one of the first electrode and second electrode is radiation transmissive.

3 . The method of claim 1 , wherein the solution further comprises a nanoparticle acceptor phase.

4 . The method of claim 3 , wherein the nanoparticle acceptor phase is at least one selected from the group consisting of fullerenes, fullerene derivatives, carbon nanotubes and graphene.

5 . The method of claim 1 , wherein the solution is drop-cast directly on a surface of the first electrode.

6 . The method of claim 1 , wherein the solution is drop-cast on a charge transfer layer or exciton blocking layer covering the first electrode.

7 . The method of claim 1 , wherein the deposited solution is vibrated at a frequency ranging from 1 Hz to 5000 Hz.

8 . The method of claim 1 , wherein the deposited solution is vibrated at a frequency ranging from 1 Hz to 1000 Hz.

9 . The method of claim 1 , wherein evaporation of the solution solvent occurs at a rate ranging from 5 μL/hr to 50 μL/hr.

10 . The method of claim 1 , wherein evaporation of the solution solvent occurs at a rate ranging from 10 μL/hr to 40 μL/hr.

11 . The method of claim 3 , wherein the ratio of the donor small molecule phase to the nanoparticle acceptor phase is from 1:10 to 10:1.

12 . The method of claim 3 , wherein the ratio of the donor small molecule phase to the nanoparticle acceptor phase is from 1:4 to 2:1.

13 . The method of claim 1 , wherein a work function alteration layer is between the first electrode and the photosensitive organic film.

14 . The method of claim 3 , wherein a work function alteration layer is between the first electrode and the photosensitive organic film.

15 . The method of claim 1 , wherein a layer comprising LiF, Li 2 O, or a mixture thereof is between the photosensitive organic film and the second electrode.

16 . The method of claim 3 , wherein a layer comprising LiF, Li 2 O, or a mixture thereof is between the photosensitive organic film and the second electrode.

17 . The method of claim 1 , wherein vibrations are provided in a lateral plane of the deposited solution.

18 . The method of claim 1 , wherein vibrations are provided outside of a lateral plane of the deposited solution.

19 . The method of claim 1 , wherein vibrations are provided in a plane normal to the lateral plane of the deposited solution.

20 . The method of claim 1 , comprising applying an electric field to the deposited solution during evaporation of the solution solvent.

Assignees

• Univ Wake Forest

Inventors

• Jurchescu Oana Diana
• Diemer Peter James

Classifications

• H10K30/50

  Photovoltaic [PV] devices · CPC title

• H10K71/40

  Thermal treatment, e.g. annealing in the presence of a solvent vapour · CPC title

• H01L51/0545

  Electricity · mapped topic

• H01L51/0003 Primary

  Electricity · mapped topic

• H01L51/442

  Electricity · mapped topic