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N/p/n tunnel junction ingaas monolithic interconnected module (mim)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Wilt, David M. Murray, Christopher S. Fatemi, Navid S. Weizer, Victor |
| Copyright Year | 2005 |
| Description | The Monolithic Interconnected Module (MIM), originally introduced at the First NREL thermophotovoltaic (TPV) conference, consists of low-bandgap indium gallium arsenide (InGaAs) photovoltaic devices, series interconnected on a common semi-insulating indium phosphide (inP) substrate. An infrared reflector is deposited on the back surface of the substrate to reflect photons, which were not absorbed in the first pass through the structure. The single largest optical loss in the current device occurs int he heavily doped p-type emitter. A new MIM design (pat.pend.) has been developed which flips the polarity of the conventional MIM cell (i.e., n/p rather than p/n), eliminating the need for the high conductivity p-type emitter. The p-type base of the cell is connected to the n-type lateral conduction layer through a thin InGaAs tunnel junction. 0.58 eV and 0.74 eV InGaAs devices have demonstrated reflectances above 90% for wavelengths beyond the bandgap (greater than 95% for unprocessed structures). Electrical measurements indicate minimal voltage drops across the tunnel junction (less than mV/junction under 1200K-blackbody illumnination) and fill factors that are above 70% at current densities (J(sub sc)) above 8 Angstroms per square centimeters for the 0.74eV devices. |
| File Size | 3461143 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050203783 |
| Archival Resource Key | ark:/13960/t3zs7q519 |
| Language | English |
| Publisher Date | 2005-05-01 |
| Access Restriction | Open |
| Subject Keyword | Energy Production And Conversion Electric Potential Metalorganic Chemical Vapor Deposition Photons Joining Thermophotovoltaic Conversion Substrates Integrated Circuits Indium Gallium Arsenides N-p-n Junctions Polarity Infrared Radiation Energy Gaps Solid State Emitters Reflectance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
