Impact of heavy hole levels on the photovoltaic conversion efficiency of InxGa1−xN/InN quantum dot intermediate band solar cells. (May 2019)

• Record Type: Journal Article
• Authors: El Aouami, A.; Feddi, K.; El Haouari, M.; El Yadri, M.; Ben Afkir, N.; Zazoui, M.; Feddi, E.; Duque, C.A.; Dujardin, F.
• Is Part Of: Superlattices and microstructures. Volume 129(2019)
• Page Start: 202
• Page End: 211
• Publication Date: 2019-05
• Subjects: Solar cells -- Photovoltaic -- Quantum dots -- Intermediate band -- Conversion efficiency -- Temperature effect; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2019.03.026
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: We report a theoretical investigation of the photovoltaic conversion efficiency of solar cells based on the introduction of I n x G a 1 − x N / I n N quantum dot supracrystals arrayed in the i-region of a p − i − n photodiode. The position and width of intermediate bands induced by the discrete quantized energy levels of electrons and holes originating from QDs are determined by using the Kronig-Penney model. Thus, interband and intersubband transitions are determined for different dot sizes and inter-dot distances. Taking into account the hole level and its impact on the band offset usually neglected in the same studies, all characteristic parameters of the cell such as open circuit voltage, short circuit current density and photoelectric conversion efficiency are determined as a function of the I n -concentration, mean size and inter-dot spacing of QDs. The results show that the performances of this new generation of solar cell increase considerably and can be adjusted by controlling the size, inter-dot spacing and I n -concentration. Highlights: Performance of intermediate band solar cells. Impact of hole levels on the efficiency. Dependence of the efficiency on dot size, interdot spacing and Indium concentration. Behaviour of the efficiency with temperature.