Efficient light harvesting and carrier transport in PbS quantum dots/silicon nanotips heterojunctions
Journal
Journal of Physics D: Applied Physics
Journal Volume
44
Journal Issue
8
Date Issued
2011
Author(s)
Abstract
Light harvesting from nanocomposites consisting of silicon (Si) nanotips and PbS quantum dots (QDs) has been investigated. We show that Si nanotips provide direct carrier transport paths, additional interfacial area and light trapping. We observe that there is a dramatic enhancement in short-circuit current (from 9.34 to 14.17mAcm-2) with nanotips structure than that of the bulk Si wafer. In addition, with an additional electron blocking layer, the photovoltaic performance can be further increased. The nanocomposites consisting of QDs and Si nanotips therefore open a promising route for efficient light harvesting from visible to infrared with improved power conversion efficiency. © 2011 IOP Publishing Ltd.
SDGs
Other Subjects
Electron blocking layer; Interfacial areas; Light-harvesting; Light-trapping; Photovoltaic performance; Power conversion efficiencies; Quantum dots; Si wafer; Conversion efficiency; Harvesting; Heterojunctions; Nanocomposites; Nanotips; Quantum chemistry; Semiconducting lead compounds; Semiconductor quantum dots; Silicon; Silicon wafers; Semiconducting silicon compounds
Type
journal article