Читать книгу Materials for Solar Energy Conversion - Группа авторов - Страница 58

Quantum dot acts as absorbing PV materials in solar cell as shown in Figure 2.11. It can be used for alternative materials, namely, cadmium telluride and silicon. The different ranges of energy level can be obtained by changing size of the dots. The band gap is fixed by using different materials [30]. Different materials are utilized to enhance efficiency of solar cells by storing solar spectrum [6].

Figure 2.9 Perovskite PV cell.

Figure 2.10 Polymer photovoltaic cell.

Figure 2.11 Quantum dot photovoltaic cell.

Quantum dots are also called as semiconducting elements, and its size should be lesser than radius of exciton bohr [12]. Quantum dots are also called as synthetic atoms. By changing dot size, it influences energy levels and band gaps [22]. Dots are grownup with different sizes and influencing band gaps without effecting materials and building techniques [8]. Different blending duration and temperatures affect wet chemistry preparations. Solar cells needed quantum dots for adjusting band gap. In conventional methods of adjusting band gap, using lead sulfide as mono junction implementation is difficult [2]. Half of the solar energy attained to the earth surface is mostly near to the infrared region. The quantum dot PV cells makes infrared reachable [9].