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Identification of process induced defects affecting the performance of nanowire based solar cells by spatially resolved photocurrent measurements

Kan, Calvin LU (2013) PHYM01 20121
Solid State Physics
Abstract
Solar power clearly has one of the greatest potential among renewable energy but a big setback is that it is still relatively expensive. Engineering of materials on a nanoscale, e.g. the growth of nanowires makes it possible to make semiconductor-materials with better optical properties while using less material than for traditional bulk semiconductors. This means that nanowire based solar cells has the potential to be cheap to produce while they also could reach high efficiencies possibly making solar cells on a large scale a reality. Lund University is one of the best in the world in growing rows of high quality nanowires and has produced a record solar cell based on InP nanowires with an efficiency of 13.8% in 2012.
During this... (More)
Solar power clearly has one of the greatest potential among renewable energy but a big setback is that it is still relatively expensive. Engineering of materials on a nanoscale, e.g. the growth of nanowires makes it possible to make semiconductor-materials with better optical properties while using less material than for traditional bulk semiconductors. This means that nanowire based solar cells has the potential to be cheap to produce while they also could reach high efficiencies possibly making solar cells on a large scale a reality. Lund University is one of the best in the world in growing rows of high quality nanowires and has produced a record solar cell based on InP nanowires with an efficiency of 13.8% in 2012.
During this project, a photocurrent measurement technique that can resolve the photocurrent on a solar cell has been further developed and evaluated. There has also been several measurements and investigations on a sample called SCIL 51-84 that had 7 III-V InP nanowire solar cells.
The work has led to identification of local defects in material and processing, and an evaluation technique that in this project is called inverted images and may lead to a safer and faster way of detecting abnormalities on these nanowire-based solar cells. Four kinds of defects were investigated and two of these could be removed using reactive ion etching with oxygen plasma. Removal of the optical defects led to an increased performance with about 40% compared to before. The limitations and suggestions on further development of the setup are also discussed. (Less)
Please use this url to cite or link to this publication:
author
Kan, Calvin LU
supervisor
organization
course
PHYM01 20121
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Nanowires, solar cells, nanotechnology, sustainable development, photocurrent measurements, energy
language
English
id
3558821
date added to LUP
2013-03-14 16:21:38
date last changed
2013-03-14 16:21:38
@misc{3558821,
  abstract     = {Solar power clearly has one of the greatest potential among renewable energy but a big setback is that it is still relatively expensive. Engineering of materials on a nanoscale, e.g. the growth of nanowires makes it possible to make semiconductor-materials with better optical properties while using less material than for traditional bulk semiconductors. This means that nanowire based solar cells has the potential to be cheap to produce while they also could reach high efficiencies possibly making solar cells on a large scale a reality. Lund University is one of the best in the world in growing rows of high quality nanowires and has produced a record solar cell based on InP nanowires with an efficiency of 13.8% in 2012.
During this project, a photocurrent measurement technique that can resolve the photocurrent on a solar cell has been further developed and evaluated. There has also been several measurements and investigations on a sample called SCIL 51-84 that had 7 III-V InP nanowire solar cells. 
The work has led to identification of local defects in material and processing, and an evaluation technique that in this project is called inverted images and may lead to a safer and faster way of detecting abnormalities on these nanowire-based solar cells. Four kinds of defects were investigated and two of these could be removed using reactive ion etching with oxygen plasma. Removal of the optical defects led to an increased performance with about 40% compared to before. The limitations and suggestions on further development of the setup are also discussed.},
  author       = {Kan, Calvin},
  keyword      = {Nanowires,solar cells,nanotechnology,sustainable development,photocurrent measurements,energy},
  language     = {eng},
  note         = {Student Paper},
  title        = {Identification of process induced defects affecting the performance of nanowire based solar cells by spatially resolved photocurrent measurements},
  year         = {2013},
}