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• W2016702386 abstract "Abstract Insertion of quantum wells (QWs) extends the absorption edge to a longer wavelength than the value of a p-i-n cell without the QWs, which is preferable for the improved current matching of a InGaP/GaAs/Ge multijunction cell. The QWs, however, reduce the open-circuit voltage ( V oc ) and degrade the fill factor; the latter is significant for a large number of QWs that are mandatory for sufficient light absorption. As a structure to minimize these drawbacks, a QW superlattice, a strain-balanced In 0.13 Ga 0.86 As (4.7 nm)/GaAs 0.57 P 0.43 (3.1 nm) stack, was implemented by metalorganic vapour-phase epitaxy. It brought about an enhancement in short-circuit current density (3.0 mA cm −2 ) with a minimal drop in V oc (0.03 V) compared with a p-i-n cell without the superlattice. The collection efficiency of photocarriers from the wells to an external circuit was evaluated: the efficiency was above 0.95 for the superlattice, while it was below 0.8 at a large forward bias for a conventional QW cell with thicker barriers. With the fast electron–hole separation in the superlattice owing to tunnelling transport, the superlattice cell exhibited a steeper increase in V oc as a function of the sunlight concentration ratio than the conventional QW cell: at the concentration ratio of 50, the value of V oc for the superlattice cell was almost equivalent to the value of the GaAs p-i-n cell without QWs. As a possible mechanism behind such an enhancement in V oc , photocurrent generation by two-step photon absorption was observed, using the electron ground state of the superlattice as an intermediate state." @default.
• W2016702386 created "2016-06-24" @default.
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• W2016702386 date "2012-12-17" @default.
• W2016702386 modified "2023-10-14" @default.
• W2016702386 title "A quantum-well superlattice solar cell for enhanced current output and minimized drop in open-circuit voltage under sunlight concentration" @default.
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• W2016702386 doi "https://doi.org/10.1088/0022-3727/46/2/024001" @default.
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