Multijunction solar cell

Multijunction Solar Cell

BCSIR scientists have a pioneering role in the field of multijunction solar cell research in Bangladesh. Currently, they are conducting research on the device physics, design, modeling and simulation of the performance of III-V bismide based novel multijunction solar cells. Previously they conducted intensive research on Germanium-based GaInP2/GaAs/Ge multijunction solar cell. Their main focus is to attain the highest theoretical efficiency of two-, three-, and four-junction solar cell by modeling and simulation. They have achieved 50% theoretical efficiency milestone by judicial material selection and device design. They are also engaging the one-dimensional multijunction solar cell simulator (MSCS-1d) development. Their vision is to develop the high efficiency concentrator solar cell in Bangladesh and help the local industries to manufacture the multijunction solar panel.

Title: Modelling and simulation of a high efficiency multijunction concentrator solar cell.


Novel Material:

BCSIR scientists proposed a novel multifunction solar cell, where all sub-layers were comprised of III-V semiconductor materials. They used GaInP2 as the first layer, GaAs as the second layer and Geas bottom cell or fourth layer. For the third layer, they used Gallium Arsenic Bismide (GaAs1-xBix) for the first time and got very promising results.

 

Device design:

 

Figure. A schematic design of GaInP2/GaAs/GaAs0.94Bi0.06/Ge multijunction solar cell.

 

 

 Theoretical Model:

In their current research and development project, they developed a theoretical model which is basically a modification of the spectral p-n junction model proposed by Nell and Barnett.  According to this model, the short-circuit current density, Jsc, has been calculated directly from the ASTM G173-03 reference spectra derived from SMARTS v. 2.9.2 (AM1.5). For evaluating of the impact of the sun concentration, an additional concentrator factor (C) is incorporated with the short-circuit current density, Jsc, the equation of spectral p-n junction model. The open circuit voltage, Voc, maximum voltage, Vm, maximum current density, Jm, fill-factor, FF and efficiencies () have been calculated by using standard solar cell equations.

 

Ultra-high theoretical efficiency milestone!

They determined around 49% theoretical efficiency for airmass AM 1.5G at the normal atmospheric condition and around 60% for concentrating condition. The following graph shows their sun efficiency versus concentration response.

 

  

Figure: Sun concentration versus efficiency for AM1.5G. The top (yellow), middle (red) and bottom (green) curves are, respectively, for 4J, 3J and 2J multijunction solar cell.

 

  1. Special allocation project:

Tittle: Development of a one dimensional multijunction solar cell simulator (MSCS-1d): version-2 (MSCS-1d: V-2)

Scientist of IPD, BCSIR developed a theoretical model and based on this model, a preliminary version of one dimensional multijunction solar cell simulator (MSCS-1d:V-1) is under construction. In our on-going project, our intention is to resolve the technical problems of the preliminary version, and develop a more efficient simulator for multijunction solar cell using Java programming language along with the help of PHP and  *.net framework. Basically this simulator could simulate all required standard equations and automatically generate all types of optoelectronic properties such as cell short-circuit current density, open circuit voltage, dark current, bandgap, thickness, width, temperature, mobility, surface recombination velocity, maximum power, fill-factor and efficiency of a multijunction solar cell that is crucially required for solar panel fabrication.   

Related Publications: click 12

Concern Scientists:

  1. Abu Kowsar, Solar Energy Conversion and Storage Research Section, Industrial Physics Division, BCSIR Laboratories, Dhaka. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
  1. Dr. Syed Farid Uddin Farhad, Solar Energy Conversion and Storage Research Section, Industrial Physics Division, BCSIR Laboratories, Dhaka. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

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