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Home Environmental Multiple-junction photovoltaic converter (PhVC) and solar battery on its base

Multiple-junction photovoltaic converter (PhVC) and solar battery on its base


Main principles of the PhVCs development are based on the following:

  • providing of resonance conditions of propagation and absorption of waves of selected sub-band of the solar spectrum;
  • multiple-layer structures development, such structures includes active semiconductor's layers and unique schematics of contacts to provide highly efficient power takeoff because of excluding of carriers recombination;
  • optical coinciding and blooming of optical systems between semiconductor's layers;
  • unique design of the solar battery

Principles had been mentioned above let us to increase significantly the solar batteries efficiency.

Multiple-junction PhVCs could be manufactured in large scales using any of current technologies, including thermal-vacuum and/or ion-plasma deposition, any kinds of epitaxy, or any suitable combination of above technologies, which are able to create dielectric and semiconductor layers with thickness accuracy of few nanometers. At present there are two Publications of International Applications: WO/2012/115602, 30.08.2012 and WO/2012/115603, International Publication Date: 30.08.2012

Elementary multi-junction PhVC (see Fig.1) contains:

  • Two semiconductor layers (11 and 12), placed sequentially along the light pass, each containing single p-n or n-p junction,
  • Transparent electric insulator 21, placed between the semiconductor layers 11 and 12
  • Two pairs of (+) and (-) discrete contact electrodes connected respectively to p- and n- regions of each semiconductor layer.
  • Contact electrodes 3 could be placed both on different sides, and on one side of each semiconductor layer 1i, where “i” – serial number of each insulator layer along the light pass.

Taking into account familiar approaches of antireflection coating of optics, its desired to have at least one transparent electric insulator 2i containing at least two transparent electric-insulating layers. Even more desirable, if each insulator 2i would contain number of transparent electric-insulating layer enough for effective optical matching of transparent PhVC’s components, taking into account said approaches of antireflection coating of optics. For example, Fig.2 demonstrates magnified view of the first multi-layered transparent insulator 21, containing “r” sequentially placed electric insulation layers 211, …21j, …21r.

Innovative Aspect and Main Advantages

Main advantages are improved efficiency and reduced thickness. The table compares these characteristics of our products and the products of main competitors.

Important characteristics
of the product
Our company Spectrolab,
Boeing Company
Japan Energy
Tipe of PhVC Multiple-junction (Si) Multiple-junction (GaAs) Multiple-junction (GaAs) One-junction (Si)
PhVCs thickness 1-2 μm ≥ 100 μm ≥ 100 μm 1-2 μm
PhVCs efficiency ≥ 40% (Est.) 32% 30% 12%
Cost Low Hi Hi Low

An additional advantage is the possibility to use during production less pure, and therefore, less expensive and available materials.

Areas of Application

Our PhVCs can be used predominantly in solar electric power stations.


Contact Details

Oleksandr Bediukh, D. Ph., Senior Research Associate,
Taras Shevchenko University, Kiev, Ukraine.
Contact Telephone 38044 526-0551
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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