NDLI: Si solid-state quantum dot-based materials for tandem solar cells

Content Provider	PubMed Central
Author	Gavin, Conibeer Ivan, Perez-wurfl Hao, Xiaojing Di, Dawei Lin, Dong
Copyright Year	2012
Abstract	The concept of third-generation photovoltaics is to significantly increase device efficiencies whilst still using thin-film processes and abundant non-toxic materials. A strong potential approach is to fabricate tandem cells using thin-film deposition that can optimise collection of energy in a series of cells with decreasing band gap stacked on top of each other. Quantum dot materials, in which Si quantum dots (QDs) are embedded in a dielectric matrix, offer the potential to tune the effective band gap, through quantum confinement, and allow fabrication of optimised tandem solar cell devices in one growth run in a thin-film process. Such cells can be fabricated by sputtering of thin layers of silicon rich oxide sandwiched between a stoichiometric oxide that on annealing crystallise to form Si QDs of uniform and controllable size. For approximately 2-nm diameter QDs, these result in an effective band gap of 1.8 eV. Introduction of phosphorous or boron during the growth of the multilayers results in doping and a rectifying junction, which demonstrates photovoltaic behaviour with an open circuit voltage (V OC) of almost 500 mV. However, the doping behaviour of P and B in these QD materials is not well understood. A modified modulation doping model for the doping mechanisms in these materials is discussed which relies on doping of a sub-oxide region around the Si QDs.
Related Links	http://dx.doi.org/10.1186/1556-276x-7-193
Starting Page	193
File Format	PDF
ISSN	1556276X
e-ISSN	1556276X
Journal	Nanoscale Research Letters
Issue Number	1
Volume Number	7
Language	English
Publisher	Springer
Publisher Date	2012-01-01
Access Restriction	Open
Rights Holder	Springer
Subject Keyword	Materials Science(all) Condensed Matter Physics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Condensed Matter Physics

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