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Two examples of organic opto-electronic devices: Light emitting diodes and solar cells
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Image of Fig. 1.
Fig. 1.

The simplest scheme (single layer) of an OLED or an OPV showing exciton formation and dissociation.

Image of Fig. 2.
Fig. 2.

J-V scheme for OPVs. represents the maximum power rectangular area shaded on the graph.

Image of Fig. 3.
Fig. 3.

Molecular structure of some organic compounds. -type: , Fullerenes , and (PCBM); -type: MEH:PPV polymer, TPD molecule, and Ruthenium complex. Polyvinyl alcohol PVA and polystyrene PS. PCBM and TPD were not used in this work, but see the first and second paragraphs of Sec. III.

Image of Fig. 4.
Fig. 4.

Schematic of spin-coating technique used to deposit thin films of organic molecules.

Image of Fig. 5.
Fig. 5.

Patterning with masking tape and orientation of the conductive glass plate.

Image of Fig. 6.
Fig. 6.

Current density-voltage plots on a semi-log scale for OLEDs. The combination of emissive layer and cathode used is indicated for each curve. WM stands for Woods metal (Bi-Pb-Cd-Sn). Inset: Current density-voltage plots (on a linear scale) showing the turn on voltage for OLEDs.

Image of Fig. 7.
Fig. 7.

Normalized electroluminescence spectra of OLEDs with different active materials.

Image of Fig. 8.
Fig. 8.

(a) CIO (Centro de Investigaciones en Optica) logo. (b) OLED with anode layer (ITO coated glass slide) patterned with the CIO logo with dimensions of . and Ga-In were used as the emissive layer and cathode, respectively.

Image of Fig. 9.
Fig. 9.

(a) Circuit diagram for measuring the full current-voltage curve. (b) Full current-voltage curve. The solid line is a guide for the eye. The OPV curve was measured using a potentiometer as a variable load, a current meter , and a voltmeter . (c) Photographs of a typical OPV cell prepared in this work where we can see the Bi-Pb-Cd-Sn cathode and the ITO anode.


Generic image for table
Table I.

Materials needed for this project. Also see Fig. 3 and Secs. IV A and IV C.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Two examples of organic opto-electronic devices: Light emitting diodes and solar cells