2007
DOI: 10.1063/1.2799172
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Intermediate-band solar cells based on quantum dot supracrystals

Abstract: The authors show that the ordered three-dimensional arrays of quantum dots, i.e., quantum dot supracrystals, can be used to implement the intermediate-band solar cell with the efficiency exceeding the Shockley-Queisser limit for a single junction cell. The strong electron wave function overlap resulting in minibands formation allows one to tune the band structure and enhance the light absorption and carrier transport. A first-principles semianalytical approach was used to determine the optimum dimensions of th… Show more

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Cited by 118 publications
(68 citation statements)
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“…This distance, determines the energy of utilized carriers. Even though the obtained values of the width of the minigap are not optimal to obtain maximal efficiency (Bremner et al, 2009;Luque & Martí, 1997;Shao et al, 2007), the increase in efficiency is significant as compared to the bulk solar cells (Kłos & Krawczyk, 2009). The impact of the discretisation of the valence band on the efficiency of the photovoltaic effect is be much lesser than that of the discretisation of the conduction band, and, in the first approximation, can be regarded as limited to a shift in valence band top in the evaluation of solar cell efficiency (Kłos & Krawczyk, 2009 …”
Section: Discussionmentioning
confidence: 99%
“…This distance, determines the energy of utilized carriers. Even though the obtained values of the width of the minigap are not optimal to obtain maximal efficiency (Bremner et al, 2009;Luque & Martí, 1997;Shao et al, 2007), the increase in efficiency is significant as compared to the bulk solar cells (Kłos & Krawczyk, 2009). The impact of the discretisation of the valence band on the efficiency of the photovoltaic effect is be much lesser than that of the discretisation of the conduction band, and, in the first approximation, can be regarded as limited to a shift in valence band top in the evaluation of solar cell efficiency (Kłos & Krawczyk, 2009 …”
Section: Discussionmentioning
confidence: 99%
“…The IBSC can be achieved using materials that have intrinsic IBs between VB and CB 4,5) or by forming the IB by quantum-dot superlattices (QDSLs) inside conventional semiconductors. The latter scheme is called the quantum dot intermediate band solar cells (QD-IBSCs) 6,7,8,9,10) . Generally, a QD-IBSC structure is fabricated by sandwiching the QDSLs inside the p-n junction, as shown in Fig.…”
Section: Introductionmentioning
confidence: 99%
“…Quantum confinement of charge carriers (electrons and holes) in variable-size quantum dots, which form the i-layer, increases the effective band gap of the material. The quantum dot size variation allows one to optimize absorption at different wavelengths and create a multicolor quantum PV cell with estimated efficiency greater than 50% [4]. Fig.…”
Section: Introductionmentioning
confidence: 99%