NDLI: Designing amorphous silicon based solar cell structure on plastic

Content Provider	IEEE Xplore Digital Library
Author	Rath, J.K. Brinza, M. Schropp, R.E.I.
Copyright Year	2009
Description	Author affiliation: Utrecht University, Faculty of Science, Debye Institute for Nanomaterial Science, Nanophotonics - Physics of Devices, P.O. Box 80000, 3508 TA, the Netherlands (Rath, J.K.; Brinza, M.; Schropp, R.E.I.)
Abstract	Fabrication of solar cells on cheap plastics, due to its demand for a low temperature processing (∼100 °C) needs adaptation of the cell structure of the state-of-the-art high efficiency thin film silicon solar cells made at high temperature (200 °C). Use of a double n-layer (n-µc-Si/n-a-Si) instead of a single n-µc-Si layer improves V from a low 0.66V to 0.82V in the as deposited state of an n-i-p type a-Si cell made at 100 °C. In a high temperature deposited cell, where a p-type µc-Si (band gap E =1.1 eV) is used in combination with a-Si i-layer (E =1.8 eV), a thin buffer a-Si layer made at 100 °C acts as a barrier for electron back diffusion from the i-layer. For the low temperature deposited i-layers this type of buffer layer loses its advantage of band offset and fails to stop the electron back diffusion. To verify this hypothesis, a-Si n-i-p cells were made with a heavily doped amorphous silicon p-layer at high hydrogen dilution (leaving out the ineffective buffer layer). We obtained indeed a high V of 0.89 V in as deposited state and after annealing at 100 °C the V reached 0.92 V. An efficiency of 6.6% was obtained for a cell made on a flat Ag/ZnO:Al back reflector (BR) on a glass substrate. A low current density of 12.5 $mA/cm^{2}$ is attributed to the fact that it was a smooth BR. The high V of 0.92V was reproduced in a similar cell on stainless steel foil substrate. Cells with similar structure and deposition condition were fabricated on plastic substrates, namely polyethylene naphthalene (.PEN) and polyethylene terpthalate (PET). Deposition conditions of ZnO:Al by magnetron sputtering were adapted to reduce the deposition related stress on the plastic foil while the Ag layer was thermally evaporated. A comparable V of 0.89 V is obtained in as deposited state and 0.92 V after annealing. The cells on PEN and PET showed initial efficiencies of 6.3% and 5.9% respectively.
Starting Page	001196
Ending Page	001199
File Size	3782524
Page Count	4
File Format	PDF
ISBN	9781424429493
ISSN	01608371
DOI	10.1109/PVSC.2009.5411232
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Amorphous silicon Photovoltaic cells Plastics Temperature Electrons Buffer layers Annealing Polyethylene Positron emission tomography Thermal stresses
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in