The absorption spectra of CdSe/ZnO and TiO2/MgZnO quantum dot (QD) solar cells were calculated, then their quantum efficiencies (QEs) were studied at different QD sizes and junction depths. Many mechanisms for tuning QE are examined. The first mechanism is doping the QD layer only, which is the case of CdSe, and it gives high QE. The second one is doping the bulk layer in addition to QDs, and it gives low QE but at a wide bandwidth, as in TiO2/MgZnO QD solar cells. Changing QD size is also another mechanism that can tune QE and its spectrum. The structures studied cover the range of 120-370 nm, which is important in photodetecting applications. (C) 2018 Optical Society of America
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