July 29, 2014, Tuesday, 209

NSF Lab Modules:Module Summaries

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NAVIGATION


MODULE SUMMARIES

The most current versions of all documents are available here. We are always updating and revising these modules so check back often. If you would like to be placed on our mailing list to be notified of updates and exciting happenings, contact Dr. Michael J. Escuti.


MODULE ONE: Liquid Crystal Display Pixel (LCD)

Fabrication Schematic of LCD Pixel
Fabrication Schematic of LCD Pixel

This lab experiment is designed to help you understand the inner workings of a modern Liquid Crystal Display (LCD). You will learn the importance of the components and layers that comprise a typical LCD in the process of fabricating and characterizing your own single pixel LCD. Starting from the transparent and conductive Indium Tin Oxide (ITO) electrodes, you will create the liquid crystal alignment layers. You will then use spacers and adhesive to create a cell of uniform thickness, measure that thickness with a spectrometer, and fill it with liquid crystal material. Finally, using a simple photodiode arrangement, you will measure the transmittance of the LCD pixel as voltage is applied.








  • Lab Procedures: PDF
  • Pre-Lab Questionnaire: PDF



MODULE TWO: Organic Light-Emitting Diode (OLED)

Fabrication Schematic of OLED
Fabrication Schematic of OLED

In this lab experiment you will fabricate your own Polymer Light Emitting Diode (pLED). You will start with a glass substrate coated with conductive indium tin oxide (ITO) as the anode and then spin-cast two polymer layers on top. The polymers will be the light-emitting polymer MEH-PPV (poly[2-methoxy-5-(2'-ethyl-hexyloxy)--1,4-phenylene vinylene]), and the hole transport layer PEDOT-PSS (poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)). Finally, you will employ a liquid metal (gallium-indium eutectic) on a second ITO-coated substrate to act as the cathode and you will seal the structure with optical adhesive. For characterization, you will measure and observe several aspects, including the color of electroluminescence, the color of photoluminescence, the turn-on voltage, the intensity vs. voltage curve, the current vs. voltage cureve, and the power efficiency.

  • Lab Procedures: PDF
  • Pre-Lab Questionnaire: PDF



MODULE THREE: Organic Photovoltaic (OPV) Solar Cell

Fabrication Schematic of OPV Cell
Fabrication Schematic of OPV Cell

In this lab experiment you will fabricate your own version of a Polymer Solar Cell, an Organic Photovoltaic (OPV) device. You will start with a glass substrate coated with transparent and conductive indium tin oxide (ITO) as the anode, and then spin-cast two polymer layers on top. The polymers will be a blended solution of electron- and hole-transport polymers, PCBM:MDMO-PPV (methano[60]fullerene [6,6]-phenyl C61 butyric acid methyl ester : poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-p-phenylene vinylene]) on top of a second hole-transport polymer, PEDOT-PSS (poly(3,4-ethylenedioxythiophene)- poly(styrenesulfonate)). Finally, you will employ a liquid metal (gallium-indium eutectic) on a second ITO-coated substrate to act as the cathode and you will seal the structure with optical adhesive. For characterization, you will measure and observe several aspects, including the current vs. voltage curve, the output created by different input illumination intensities, the power efficiency, and the absorbance spectrum.

  • Lab Procedures: PDF
  • Pre-Lab Questionnaire: PDF



MODULE FOUR: Organic Thin-Film Transistor (OTFT)

Fabrication Schematic of OTFT
Fabrication Schematic of OTFT

This lab experiment is designed to help you understand the construction and operation of an Organic Thin-Film Transistor (OTFT). You will learn the importance of the electrodes, organic layers, and the other infrastructure comprising an OTFT in the process of fabricating and characterizing your own. Starting from the conductive, transparent and interdigitated indium tin oxide (ITO) source and drain electrodes, you will apply an organic layer, P3HT (poly(3-hexylthiophene)), and an insulating layer, PVA (polyvinyl alcohol). You will then create a gate structure containing a liquid metal (gallium-indium eutectic) and finalize the assembly using optical adhesive. Finally, you will characterize your OTFT by measuring current vs. voltage data, determining the turn-on voltage, and analyzing the various operation regimes.


  • Lab Procedures: PDF
  • Pre-Lab Questionnaire: PDF