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16WORKING PRINCIPLES OF HETEROJUNCTION SOLAR CELLS
Ismoilov U.,
Independent researcher Siddikova S., Teacher of physics Komilov M., Master student Eraliyev A., Bachelor student Andijan State University Zulunova M. Bachelor student Andijan machine building institute
Abstract
It is more important to study multi-transition solar cells than single-transition solar cells. This is because spectral imbalances can be eliminated by creating multiple transitions. Heterogeneous transitions are the basis of many transitions. Therefore, heterogeneities have been studied in this study.
Keywords: heterojunction, silicon, tandem solar cell, band diagram
Heterogeneity is the p-n transition made up of two different materials [1]. There are also silicon-based het-eroconducting solar cells [2]. Today, scientists are extensively studying ZnO / Si heterosexual solar cells [3].
From Figure 1 we can use ZnO as an emitter [4] and we can see the reason from the zone diagram shown in Figure 1.
Figure 1. The structure of a solar element with heteroconductivity ZnO-n / Si-p
ZnO is used to separate the pair of electron cavities formed in the base and to act as a potential barrier for the holes [5]. Because its bandwidth is three times the bandwidth of silicon [6].
The efficiency of a silicon-based heterostructural solar cell depends on the electronic proximity of the emitter material [7]. In Figure 2 I can see that the effi-
ciency of the solar cell depends on the electron proximity. In this case, the highest efficiency of ZnO with an electron affinity in the range of 4 eV to 2.3 eV was determined by modeling [8]. Therefore, Figure 3 shows the results of a solar cell made mainly of ZnO with an electron affinity in this range. It is known that the maximum efficiency of this solar cell is 20.3% [9].
n-ZnO
Figure 2. Band diagram of ZnO-n / Si-p heteroconducting solar cells
The efficiency of a silicon-based heteroconductor eling in Figure 4, we can see that the maximum effi-solar cell is directly related to the bandwidth of the ciency is 3.21 eV. It was found that a solar cell with an emitter material [10]. From the result obtained by mod- electron affinity of 4.4 eV has the highest efficiency.
Electron Affinity (eV)
Figure 3. Dependence of the efficiency of a silicon-based heteroconducting solar cell on the electron proximity
of the emitter material
Bandgap (eV)
Figure 4. The dependence of the efficiency of a silicon-based heteroconducting solar cell on the width of the forbidden zone of the emitter material
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