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Optimization of Graded CIGS Solar Cells Using TCAD Simulations

Published online by Cambridge University Press:  13 June 2012

Mankoo Lee ,
Dipankar Pramanik ,
Haifan Liang ,
Ed Korczynski  and
Jeroen van Duren
Mankoo Lee
Affiliation:
Intermolecular, Inc., 3011 North First Street, San Jose, CA 95134 United States
Dipankar Pramanik
Affiliation:
Intermolecular, Inc., 3011 North First Street, San Jose, CA 95134 United States
Haifan Liang
Affiliation:
Intermolecular, Inc., 3011 North First Street, San Jose, CA 95134 United States
Ed Korczynski
Affiliation:
Intermolecular, Inc., 3011 North First Street, San Jose, CA 95134 United States
Jeroen van Duren
Affiliation:
Intermolecular, Inc., 3011 North First Street, San Jose, CA 95134 United States
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Abstract

To understand paths towards higher efficiency (η) for copper-indium-gallium-(sulfur)-selenide [CIG(S)Se] solar cells, we investigated a variety of absorber composition grading schemes for various back-side gallium (Ga), front-side sulfur (S), and double-graded Ga composition depth profiles in TCAD 1D/2D simulations. We fitted experimental results of a Back-Side Graded (BSG) solar cell with our TCAD models, prior to investigating other grading and interface schemes. The BSG solar cell was fabricated on a High Productivity Combinatorial (HPC™) platform based on sputtering Cu(In,Ga) followed by selenization. Our TCAD simulation methodology for optimizing CIG(S)Se solar cells started with a sensitivity analysis using 1D Solar-cell CAPacitance Simulator (SCAPS) [1] by selecting a typical range of key model parameters and analyzing the impact on η. We then used a 2D commercially-available Sentaurus simulation tool [2] to incorporate wavelength-dependent optical characteristics. As a result, we provide insight in the impact of grading schemes on efficiency for a fixed ‘material quality’ equal to an in-house BSG solar cell. We also quantify the effects of interface layers like MoSe2 at the Mo/CIG(S)Se interface, and an inverted surface layer at the CIG(S)Se/CdS interface.

Keywords

barrier layerfilmphotovoltaic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1447: Symposium V – Nanostructured and Advanced Materials for Solar-Cell Manufacturing , 2012 , mrss12-1447-v03-21
Copyright
Copyright © Materials Research Society 2012

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References

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