Abstract
The major challenge of PV cell design and installation has always been to find the optimum cost per energy and area of installation of solar panels. In densely populated and high-yielding agricultural country like India land acquisition is becoming an issue. Moreover the consisting demand to deduce the cost per energy indulges the worldwide scientists to design more efficient solar cells with low production cost. In developing countries scientists and engineers are trying to find an amicable solution to meet up these problems. In this paper the mathematical modelling of a dual SIS bifacial vertically mounted solar panel has been proposed to mitigate the energy and land area crisis in countries of Indian subcontinent, south Asia and elsewhere. The SIS (Semiconductor-Insulator-Semiconductor) technology was chosen for its extremely low thermal budget and less complicated production procedure. A bifacial solar cell with SIS junction in both sides was modelled. The front surface SIS junction was considered ZnO-SiO2-Si(p-type) while the back surface junction was considered Si(p type)-Al2O3-SnO. The efficiency for front and back surface was calculated as 5.64% and 5.58% respectively. We have further considered the effect of albedo from two different surfaces (soil and concrete) and the efficiencies of front and back surface for these albedo radiations. The angle of installation was optimized for both these effects. Considering both direct and albedo the all-day efficiency was calculated as 22.47% for a sunny day tropical region.
Highlights
In conventional mono-facial solar cells harvest solar power only through its front surface
To understand the advantage of bifacial solar cell while photon is being absorbed by both the surfaces a concept of all day efficiency was adopted
The mathematical model of this article shows a significant enhancement in energy efficiency for agricultural and highway applications in tropical countries like India
Summary
In conventional mono-facial solar cells harvest solar power only through its front surface. In the second half the situation gets reversed The efficiency of both the surfaces was estimated using MATLAB software coding for both direct AM 1.5 sunlight spectra and albedo spectra and the all day efficiency was estimated for two different types of earth surface, one for agro-voltaic and another for highway application. The graph concludes that there is almost no change in photo generated current for higher wavelength photon flux This is because both the ZnO and SnO layer acts transparent for this region of the spectra. Both the junctions are considered to be formed by SIS junctions of materials (ZnO and SnO) with similar physical properties (Table 1). Experimental results reported by other groups of scientists compliment the computational value of this literature [16, 17]
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