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Title: Segregated tandem filter for enhanced conversion efficiency in a thermophotovoltaic energy conversion system

A filter system to transmit short wavelength radiation and reflect long wavelength radiation for a thermophotovoltaic energy conversion cell comprises an optically transparent substrate segregation layer with at least one coherent wavelength in optical thickness; a dielectric interference filter deposited on one side of the substrate segregation layer, the interference filter being disposed toward the source of radiation, the interference filter including a plurality of alternating layers of high and low optical index materials adapted to change from transmitting to reflecting at a nominal wavelength .lambda..sub.IF approximately equal to the bandgap wavelength .lambda..sub.g of the thermophotovoltaic cell, the interference filter being adapted to transmit incident radiation from about 0.5.lambda..sub.IF to .lambda..sub.IF and reflect from .lambda..sub.IF to about 2.lambda..sub.IF ; and a high mobility plasma filter deposited on the opposite side of the substrate segregation layer, the plasma filter being adapted to start to become reflecting at a wavelength of about 1.5.lambda..sub.IF.
 [1];  [1];  [2]
  1. (Clifton Park, NY)
  2. (Middlegrove, NY)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) KAPL
Patent Number(s):
US 5700332
Contract Number:
Research Org:
Knolls Atomic Power Laboratory (KAPL), Niskayuna, NY
Country of Publication:
United States
segregated; tandem; filter; enhanced; conversion; efficiency; thermophotovoltaic; energy; transmit; wavelength; radiation; reflect; cell; comprises; optically; transparent; substrate; segregation; layer; coherent; optical; thickness; dielectric; interference; deposited; disposed; source; including; plurality; alternating; layers; index; materials; adapted; change; transmitting; reflecting; nominal; lambda; approximately; equal; bandgap; incident; mobility; plasma; opposite; start; transparent substrate; optical thickness; wavelength radiation; incident radiation; optically transparent; interference filter; approximately equal; cell comprises; alternating layers; conversion efficiency; energy conversion; photovoltaic cell; thermophotovoltaic energy; plasma filter; filter including; conversion cell; enhanced conversion; parent substrate; thermophotovoltaic cell; photovoltaic energy; /136/359/