Excitonic energy transfer to increase inorganic solar cell efficiency

Patent metadata

Field	Value
Publication number	US-10074820-B2
Application number	US-201314429929-A
Country	US
Kind code	B2
Filing date	Sep 26, 2013
Priority date	Sep 26, 2012
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

The present disclosure relates to a photosensitive optoelectronic device comprising two electrodes, an inorganic subcell positioned between the two electrodes, wherein the inorganic subcell comprises at least one inorganic semiconductor material having a band gap energy (E G ), and an organic sensitizing window layer disposed on the inorganic subcell. In one aspect, the organic sensitizing window layer comprises a singlet fission material. In another aspect, the organic sensitizing window layer comprises a singlet fission host and a phosphorescent emitter dopant, where the singlet fission host exhibits an excitation triplet energy (E T-SF ) greater than or equal to an excitation triplet energy (E T-PE ) exhibited by the phosphorescent emitter dopant.

First claim

What is claimed is:

1. A photosensitive optoelectronic device comprising:
two electrodes;
an inorganic subcell positioned between the two electrodes, wherein the inorganic subcell comprises at least one inorganic semiconductor material having a band gap energy (E G ); and
an organic sensitizing window layer disposed on the inorganic subcell, wherein the organic sensitizing window layer comprises a singlet fission host and a phosphorescent emitter dopant, the singlet fission host exhibiting an excitation triplet energy (E T-SF ) greater than or equal to an excitation triplet energy (E T-PE ) exhibited by the phosphorescent emitter dopant.

2. The device of claim 1 , wherein the singlet fission host exhibits an absorptivity of light of at least 10 3 cm −1 at one or more wavelengths ranging from 300 to 700 nm.

3. The device of claim 1 , wherein the singlet fission host has an excitation singlet energy (E S-SF ) greater than 2.0 eV.

4. The device of claim 1 , wherein the phosphorescent emitter dopant emits radiation at one or more wavelengths in the red/NIR spectral region.

5. The device of claim 4 , wherein the phosphorescent emitter dopant exhibits highest phosphorescence efficiency in the red/NIR spectral region.

6. The device of claim 1 , wherein the phosphorescent emitter emits radiation at an energy greater than or equal to the band gap energy (E G ).

7. The device of claim 1 , wherein the singlet fission host is chosen from polyacenes, rylenes, rubrenes, and biradicaloids.

8. The device of claim 7 , wherein the polyacenes are anthracene, tetracene, pentacene, and derivatives thereof, and the biradicaloids are benzofurans.

9. The device of claim 1 , wherein the phosphorescent emitter dopant comprises a material chosen from metal porphyrins and phthalocyanines.

10. The device of claim 9 , wherein the metal porphyrins are platinum porphyrins.

11. The device of claim 10 , wherein the platinum porphyrins are platinum tetraphenyl-tetrabenzo-porphyrin (PtTPBP), tetraphenyltetranaptho platinum porphyrin (PtTPNP), tetraphenyltetraanthro platinum porphyrin (PtANP), platinum-diphenyltetranaptho-porphyrin (PtDPNP), and derivatives thereof.

Assignees

• Forrest Stephen R
• Thompson Mark E
• Univ Southern California
• Univ Michigan Regents

Inventors

• Forrest Stephen R
• Thompson Mark E

Classifications

• Y02E10/549

  Organic PV cells · CPC title

• Y02E10/52

  PV systems with concentrators · CPC title

• H01L51/422 Primary

  Electricity · mapped topic

• H10K30/50

  Photovoltaic [PV] devices · CPC title

• H10K30/15

  Sensitised wide-bandgap semiconductor devices, e.g. dye-sensitised TiO2 (photo-electrochemical devices comprising a liquid electrolyte or a solid electrolyte H01G9/20) · CPC title