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RENEWABLE ENERGY AND APPLIED PHOTONICS
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FACILITIES

Our main laboratory at The Science and Technology Center at Tufts University includes 4 rooms of class 10,000 clean space as well as 1 room of class 100 space.  We also have lab space at the Tufts Micro and Nano Fabrication Facility at 200 Boston Ave.

Deposition:

Ion Beam Sputter System

This sputter system has been refurbished by John Chivers and is capable of depositing many different materials.  We use it primarily for deposition of contacts such as transparent conducting oxides (TCOs) such as Indium Tin Oxide (ITO) or Titanium Dioxide (TiO2) or more traditional contacts such as gold.

Processing:

Chemistry Fume Hood (3)

We have three chemistry fume hoods at our disposal, each 5 feet wide.

 

HEPA Hood

HPA1

This horizontal laminar flow station is over 6 feet wide and is primarily used for wafer and sample prep.  All air inside the hood is run through HEPA filters to remove particulate airborne contamination thus keeping the samples inside clean.  Also attached is a nitrogen gas blower.

 

Characterization:

Solar Simulator

This Oriel Solar Simulator from Newport Corporation is complete with probe station, cooling stage, vacuum sample holder, light intensity monitor, filter holders, and source-meter.  It is capable of using several different bulbs up to 1600W to provide almost 14 suns of illumination.  We use this to generate I-V curves for solar cells in order to determine their operating parameters.

"CryoSim" Cryogenic Thermal Simulator

The CryoSim is used to test the conversion efficiency of low temperature Thermophotovoltaics (TPV) operating in the infrared with wavelengths greater than 7um.  The tester consists of a liquid nitrogen cooling system, temperature controlled sample stage, high vacuum chamber, and blackbody radiation source.

Mid-Range Thermal Simulator

The Mid-Range Thermal Simulator is used to test thermophotovoltaic cells in atmosphere.  It consists of a blackbody radiator with a range of 50 to 1050C.  Glycol cooling is used to keep the sample from overheating.

High Temperature Blackbody Radiator

The High Temperature Blackbody Simulator is used to test thermophotovoltaic cells in atmosphere.  It consists of a blackbody radiator with a range of 500 to 3000C.  Water cooling is used to keep the sample from overheating.  This setup can also be used to test the emissivity properties of materials at high temperatures.

Split Junction Solar Concentrator

The split junction concentrator is used to test how photovoltaics and thermophotovoltaics work when used together with a dichroic filter to separate the incident solar radiation into visible and infrared sections which are then focused onto the PV and TPV cells respectably.

Photoluminescence

The PL setup has a Helium Neon (HeNe) laser with wavelength (632.8nm), and a violet diode laser at 405nm.  A cryostat is incorporated to test samples at low temperatures.

Thermal Bath Temperature Regulator

The Thermal Bath Temperature Regulator can maintain a liquid at a specified temperature.  It integrates a heater, chiller, and circulation pump and can operate over a wide temperature range depending on the liquid in use.  This equipment is used to test the energy harvesting properties of TPV devices while submerged in a liquid.

We also have immediate access to shared facilities in the building including, X-ray diffractometers (XRD), Variable Angle Spectroscopic Ellipsometer (VASE), Fourier Tranxform Infrared Spectroscopy (FTIR).

Storage:

Wafer Storage

This is a nitrogen dry-box which we use to store wafers and samples.

Nitrogen Generator

This is a nitrogen generator which separates the nitrogen from the air for use in the dry-box and HEPA hood..