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(Color online) (a) Schematic diagram of a superlattice photodiode design. (b) The band alignments of M-superlattice structure; the dash line shows the letter M shape of the band alignment. (c) Band alignment of standard type II superlattice.
(Color online) [(a) and (c)] Band line up and [(b) and (d)] built-in electric field distribution of a standard junction and a junction with M barrier.
(Color online) Electrical characterizations of superlattices with M-structure barrier. (a) Current vs voltatge. (b) Differential resistance–area product vs voltage. A maximum of was achieved with thick M-structure barrier.
(Color online) Optical characterization of superlattices with M-structure barrier.
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